- Department of Engineering Design and Manufacture, Faculty of Engineering Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
- Ceramics (Engineering Ceramics, Microstructural Investigation), Cutting Tool Technology (Ceramics Cutting Tool, Ceramics Machining), Failure Analysis (Materials Charaterization, Microstructural Investigation), Bio Meterial (Hydroxyapatite, Forsterite, Zirconia, and 5 moreAlumina, Ceramics (Zirconia, Hydroxyapatite, Ceramics Composites, and Steatite)edit
Research Interests: Materials Engineering, Materials Science, Biomaterials, Mechanical Properties of Ceramics, Hydroxyapatite, and 15 moreCalcium, Fracture Mechanics, Mechanical properties, Drugs, Exercise Science, Cnt, Mechanical Properties of Materials, Grain Growth, Growth Factors, Composite Material, Fracture Toughness, Elastic Moduli, Bulk Density, Mechanical Property, and High density
This paper describes an approach to implementing technology-assisted problem solving (TAPS) package using desktop virtual reality interface that brings together a 3-D model of an engineering mechanics problem in an interactive manner. It... more
This paper describes an approach to implementing technology-assisted problem solving (TAPS) package using desktop virtual reality interface that brings together a 3-D model of an engineering mechanics problem in an interactive manner. It provides the user with a self-study environment in which to solve an engineering mechanics problem in mechanical engineering course. The package guides the user to solve a problem in a step-by-step approach and graphical environment. Integrating components such as 2-D, 3-D and stereoscopic images provides dynamic learning environment and guidance so that the learner can analyze the necessary actions to be taken in the virtual environment. Preliminary evaluation indicated that the TAPS package has great potential to aid teaching and thus provide an effective learning environment.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4568520&tag=1
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4568520&tag=1
Research Interests: Information Technology, Engineering Mechanics, Ergonomics, Decision Making, Fluid Mechanics, and 22 moreCreative Problem Solving, Industrial Design, Packaging, Product Design, High Speed Aerodynamics, Art in three dimensional worlds, Virtual Worlds, Virtual Reality, Prototyping, I'm working on using QFD for engineering courses specs, and for developing TQM system, Virtual Environment, Furniture, 3d Modeling, Mindfulness in Effective Teaching and Learning, conferences in College international of philosophy, Design Methodology, Learning and Adaptation in Intercultural Contexts, Uncertainty Reduction and Social Identity, Team Dynamics, Desktop Virtual Reality, Graphical Environments, Step-by-step Approach, Stereoscopic Imaging, and Materials Technology (Wood Derivatives)(Creative Problem Solving, Industrial Design, Packaging, Product Design, High Speed Aerodynamics, Art in three dimensional worlds, Virtual Worlds, Virtual Reality, Prototyping, I'm working on using QFD for engineering courses specs, and for developing TQM system, Virtual Environment, Furniture, 3d Modeling, Mindfulness in Effective Teaching and Learning, conferences in College international of philosophy, Design Methodology, Learning and Adaptation in Intercultural Contexts, Uncertainty Reduction and Social Identity, Team Dynamics, Desktop Virtual Reality, Graphical Environments, Step-by-step Approach, Stereoscopic Imaging, and Materials Technology (Wood Derivatives))
(Creative Problem Solving, Industrial Design, Packaging, Product Design, High Speed Aerodynamics, Art in three dimensional worlds, Virtual Worlds, Virtual Reality, Prototyping, I'm working on using QFD for engineering courses specs, and for developing TQM system, Virtual Environment, Furniture, 3d Modeling, Mindfulness in Effective Teaching and Learning, conferences in College international of philosophy, Design Methodology, Learning and Adaptation in Intercultural Contexts, Uncertainty Reduction and Social Identity, Team Dynamics, Desktop Virtual Reality, Graphical Environments, Step-by-step Approach, Stereoscopic Imaging, and Materials Technology (Wood Derivatives))
Over the years new coating design and technology for structures have received much attention mainly due to the demand for longer life span and durability. Conventional coating general consists of few homogeneous layers being deposited on... more
Over the years new coating design and technology for structures have received much attention mainly due to the demand for longer life span and durability. Conventional coating general consists of few homogeneous layers being deposited on the parent material or substrate. These layers are very vulnerable to cracking followed by de-bonding due to mismatch thermo-mechanical property. To avoid such coating failures, functionally graded material (FGM) is proposed in the coating design. Hence, this study analyzes FGM plates subjected to transverse load with clamped edges. Three configurations were considered. The first involves a two-layer plate in which a homogeneous coating layer was coated on a homogeneous substrate. The second involves a two layer system with the first layer as a FGM coating followed by the homogeneous substrate and the final configuration was a three layer system. The top and bottom layers are homogenous coating and substrates respectively, and the interlayer is composed of FGM. The Young's modulus of FGM plates is assumed to vary in the thickness direction based on the sigmoid functions and the Poisson's ratio remain constant throughout the FGM plate. The analysis was carried out in the context of two-dimensional elasticity theory and the method of superposition was used to find a series solution. The deflections, strains, and stresses were evaluated and the differences between the elastic behaviors of all three design configurations were investigated.
http://ac.els-cdn.com/S1359836812005975/1-s2.0-S1359836812005975-main.pdf?_tid=bdc4d316-e777-11e2-bed9-00000aab0f02&acdnat=1373251404_aef28c551293c961249fa40e35625a42
http://ac.els-cdn.com/S1359836812005975/1-s2.0-S1359836812005975-main.pdf?_tid=bdc4d316-e777-11e2-bed9-00000aab0f02&acdnat=1373251404_aef28c551293c961249fa40e35625a42
Research Interests: Applied Mathematics, Structural Engineering, Computational Mechanics, Nonlinear Elasticity, Responses of plant to abiotic stresses, and 26 moreBoundary Layers, Structural Health Monitoring, Mechanical Behavior Of Materials, Stability, Reverse Engineering, Micromechanics, Fatigue crack growth, Plates and shells, Seismic Risk Assessment, Analytical Modeling, Functionally graded materials, Composite structures, Interface, Thermoelasticity, European substrate and poorly attested languages, Conservation Engineering, Heritage structures, Structural Masonry, Condition Assessment, Layered Structures, Transverse Load, Form Finding, Historic Masonry Structures, Timber Frame Structures, Masonry Shells, and Reinforced and Prestressed Concrete(Boundary Layers, Structural Health Monitoring, Mechanical Behavior Of Materials, Stability, Reverse Engineering, Micromechanics, Fatigue crack growth, Plates and shells, Seismic Risk Assessment, Analytical Modeling, Functionally graded materials, Composite structures, Interface, Thermoelasticity, European substrate and poorly attested languages, Conservation Engineering, Heritage structures, Structural Masonry, Condition Assessment, Layered Structures, Transverse Load, Form Finding, Historic Masonry Structures, Timber Frame Structures, Masonry Shells, and Reinforced and Prestressed Concrete)
(Boundary Layers, Structural Health Monitoring, Mechanical Behavior Of Materials, Stability, Reverse Engineering, Micromechanics, Fatigue crack growth, Plates and shells, Seismic Risk Assessment, Analytical Modeling, Functionally graded materials, Composite structures, Interface, Thermoelasticity, European substrate and poorly attested languages, Conservation Engineering, Heritage structures, Structural Masonry, Condition Assessment, Layered Structures, Transverse Load, Form Finding, Historic Masonry Structures, Timber Frame Structures, Masonry Shells, and Reinforced and Prestressed Concrete)
Thermal analysis of hydroxyapatite formation through dry mechanochemical method has been studied. The calcium phosphate was synthesized using calcium hydroxide and di-ammonium hydrogen phosphate as the precursors. The ball milling of 1/6... more
Thermal analysis of hydroxyapatite formation through dry mechanochemical method has been studied. The calcium phosphate was synthesized using calcium hydroxide and di-ammonium hydrogen phosphate as the precursors. The ball milling of 1/6 ball-powder mass ratio was employed on mixtures of calcium hydroxide and di-ammonium hydrogen phosphate in three different speeds 170, 270 and 370 rpm for 15 h. As ball-milled powders were then sintered at 1150, 1250 and 1350°C for 2 h, then subjected to TGA, XRD and FTIR for phase characterization. Calcium phosphates with ammonium are phases of the material. The ammonium is trace of phosphorus precursor. Choosing condition of the process and type of precursors determines type of reactions and its products.
http://link.springer.com/chapter/10.1007/978-3-642-21729-6_30
http://link.springer.com/chapter/10.1007/978-3-642-21729-6_30
Research Interests: Phase Transformations, Hydroxyapatite, FTIR spectroscopy, Isotope Ratio Mass Spectrometry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, and 12 moreBrewing, Heating, Ventilating, Air Conditioning & Refrigeration, Small molecule synthesis isolation, characterization of various classes of organic/Nucleosides & Nucleotides Chemists and peptide solid phase synthesis, Foods, Grain, Synthesis of Nano Crystalline Hydroxyapatite in Injectable Forms, Milling, Bakery, Application of different semiconducting materials: Applications in biological and different electrical e.g. photo detector, luminescent devices and different areas of electronics as well as high-speed electro-optic devices and solar cell, fuel cell etc., Mechanochemical Method, Di-ammonium Hydrogen Phosphate, and Ball-milled(Brewing, Heating, Ventilating, Air Conditioning & Refrigeration, Small molecule synthesis isolation, characterization of various classes of organic/Nucleosides & Nucleotides Chemists and peptide solid phase synthesis, Foods, Grain, Synthesis of Nano Crystalline Hydroxyapatite in Injectable Forms, Milling, Bakery, Application of different semiconducting materials: Applications in biological and different electrical e.g. photo detector, luminescent devices and different areas of electronics as well as high-speed electro-optic devices and solar cell, fuel cell etc., Mechanochemical Method, Di-ammonium Hydrogen Phosphate, and Ball-milled)
(Brewing, Heating, Ventilating, Air Conditioning & Refrigeration, Small molecule synthesis isolation, characterization of various classes of organic/Nucleosides & Nucleotides Chemists and peptide solid phase synthesis, Foods, Grain, Synthesis of Nano Crystalline Hydroxyapatite in Injectable Forms, Milling, Bakery, Application of different semiconducting materials: Applications in biological and different electrical e.g. photo detector, luminescent devices and different areas of electronics as well as high-speed electro-optic devices and solar cell, fuel cell etc., Mechanochemical Method, Di-ammonium Hydrogen Phosphate, and Ball-milled)
Biphasic calcium phosphate powders doped with zinc (Zn-doped BCP) were synthesized via sol-gel technique. Different concentrations of Zn have been successfully incorporated into biphasic calcium (BCP) phases namely: 1%, 2%, 3%, 5%, 7%,... more
Biphasic calcium phosphate powders doped with zinc (Zn-doped BCP) were synthesized via sol-gel technique. Different concentrations of Zn have been successfully incorporated into biphasic calcium (BCP) phases namely: 1%, 2%, 3%, 5%, 7%, 10% and 15%. The synthesized powders were calcined at temperatures of 700-900°C. The calcined Zn-doped BCP powders were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential and thermogravimetric analysis (TG/DTA) and field-emission scanning electron microscopy (FESEM). X-ray diffraction analysis revealed that the phases present in Zn-doped are hydroxyapatite, β- TCP and parascholzite. Moreover, FTIR analysis of the synthesized powders depicted that the bands of HPO4 increased meanwhile O-H decreased with an increase in the calcination temperature. Field emission scanning electron microscopy (FESEM) results showed the agglomeration of particles into microscale aggregates with size of the agglomerates tending to increase with an increase in the dopant concentration.
http://www.scientific.net/KEM.531-532.614
http://www.scientific.net/KEM.531-532.614
Research Interests: Nanomaterials Characterization, Biomedical, Sol Gel Techniques, Semiconductor Nanomaterials., Sol-Gel, Nanopowder, and 10 moreSkills & Expertise : Spectrophotometry TLC-Optical Scanning Densitometry TLC-Image Analysis TLC-Spectrometry Industrial Wate Recycling & Product Generation FTIR Applied Thin Layer Chromatography Colour Quantification and Analytical Applications, Biphasic Calcium Phosphate, Biphasic Calcium Phosphates, Calcination Temperature, As-synthesized Powder, Field Emission Scanning Electron Microscopy, Zinc Doping, Dopant Concentrations, Microscale Aggregates, and Nano Powders(Skills & Expertise : Spectrophotometry TLC-Optical Scanning Densitometry TLC-Image Analysis TLC-Spectrometry Industrial Wate Recycling & Product Generation FTIR Applied Thin Layer Chromatography Colour Quantification and Analytical Applications, Biphasic Calcium Phosphate, Biphasic Calcium Phosphates, Calcination Temperature, As-synthesized Powder, Field Emission Scanning Electron Microscopy, Zinc Doping, Dopant Concentrations, Microscale Aggregates, and Nano Powders)
(Skills & Expertise : Spectrophotometry TLC-Optical Scanning Densitometry TLC-Image Analysis TLC-Spectrometry Industrial Wate Recycling & Product Generation FTIR Applied Thin Layer Chromatography Colour Quantification and Analytical Applications, Biphasic Calcium Phosphate, Biphasic Calcium Phosphates, Calcination Temperature, As-synthesized Powder, Field Emission Scanning Electron Microscopy, Zinc Doping, Dopant Concentrations, Microscale Aggregates, and Nano Powders)
Strontium is one of metallic elements found in bones and teeth. It is an essential substance in preventing osteoporosis and has the ability to regenerate, preserve, and even restore bone growth. Synthesizing Sr-doped HA powder is of great... more
Strontium is one of metallic elements found in bones and teeth. It is an essential substance in preventing osteoporosis and has the ability to regenerate, preserve, and even restore bone growth. Synthesizing Sr-doped HA powder is of great importance accordingly. Here we present Sr-doped HA powders prepared via sol-gel procedure using calcium nitrate and diammonium hydrogen phosphate as the precursors. Strontium nitrate was used as the dopant source, and its concentration was varied from 2∼15 %. An ammoniacal solution was heated until a white gel was obtained. The obtained gel was then dried and subsequently subjected to 900°C calcination. Characterization on the obtained powder was conducted using XRD, FTIR, and FESEM. XRD measurement had shown that the powder contained hydroxyapatite phase only. Morphological evaluation by FESEM measurement shows that the particles of the Sr -doped HA agglomerates are globular in shape with an average size of 1-2 μm in diameter. Meanwhile, the primary particles have a diameter of 50-150 nm in average. It is likely Sr has played an important role as a calcination or sintering additive, causing more progressive densification of particles.
http://www.scientific.net/AMR.47-50.928
http://www.scientific.net/AMR.47-50.928
Research Interests: Biochemistry, Medicinal Chemistry, Bioinorganic Chemistry, Organic Synthesis, 1) Materials Physics & Chemistry (in fields of: Dielectric, Semiconductive, Optical and Physical properties of Materials)., and 18 moreSciences Des Matériaux, Couches Minces, Synthesis and Characterization of TiO2 Nanocrystals Through Sol-gel and Hydrothermal Methods, Sintering Additives, Hydroxyapatite Powders, Primary Particles, Sr-doped Hydroxyapatite, Average Sizes, Bone Growths, Calcium Nitrates, Diammonium Hydrogen Phosphates, Dopant Sources, HA Powders, Metallic Elements, Morphological Evaluations, Sol gel, Chimie De Solide, and Verres Et Céramiques(Sciences Des Matériaux, Couches Minces, Synthesis and Characterization of TiO2 Nanocrystals Through Sol-gel and Hydrothermal Methods, Sintering Additives, Hydroxyapatite Powders, Primary Particles, Sr-doped Hydroxyapatite, Average Sizes, Bone Growths, Calcium Nitrates, Diammonium Hydrogen Phosphates, Dopant Sources, HA Powders, Metallic Elements, Morphological Evaluations, Sol gel, Chimie De Solide, and Verres Et Céramiques)
(Sciences Des Matériaux, Couches Minces, Synthesis and Characterization of TiO2 Nanocrystals Through Sol-gel and Hydrothermal Methods, Sintering Additives, Hydroxyapatite Powders, Primary Particles, Sr-doped Hydroxyapatite, Average Sizes, Bone Growths, Calcium Nitrates, Diammonium Hydrogen Phosphates, Dopant Sources, HA Powders, Metallic Elements, Morphological Evaluations, Sol gel, Chimie De Solide, and Verres Et Céramiques)
The sinterability of magnesium oxide (MgO) doped hydroxyapatite (HA) ranging from 1 to 10 wt% when sintered at 1150°C was investigated in terms of phase stability, bulk density, Young's modulus, Vickers hardness and fracture toughness.... more
The sinterability of magnesium oxide (MgO) doped hydroxyapatite (HA) ranging from 1 to 10 wt% when sintered at 1150°C was investigated in terms of phase stability, bulk density, Young's modulus, Vickers hardness and fracture toughness. The addition of up to 1 wt% MgO as sintering additive was found to be beneficial in promoting the densification of HA. Further addition of MgO in the HA matrix would deteriorate its densification properties. Similar results were observed for its stiffness and Vickers hardness. Nevertheless, the fracture toughness of HA was greatly enhanced by the incorporation of 5 wt% MgO. An increased toughness of up to 35% was obtained for the MgOdoped HA when compared to the undoped HA. This improvement is associated to the smaller grain size of the doped sample as compared to the undoped HA.
http://www.scientific.net/AMR.264-265.1849
http://www.scientific.net/AMR.264-265.1849
Research Interests: Computational Fluid Dynamics, Mechanical Properties of Ceramics, Heat Transfer, Fracture Mechanics, Nano-bioceramics for prosthetic implants through tissue engineering, and 24 moreExtracellular Matrix, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Mechanical properties, Magnesium, Bioceramics, Vickers Hardness, Grain size, Apatite, Electrophoretic Deposition, Aquaculture, Fish Nutrition, Feed Additives, Young's modulus, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Fracture Toughness, Sintering Additives, Doped Sample, Sinterability, Magnesium Oxides, Magnesium Oxide (MgO), Two Phase Flows, Nanofluids Stability, Rheological Studies, Hydroxyapatite Based Coatings, Corrosion Behaviour, and Solgelcoating etc(Extracellular Matrix, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Mechanical properties, Magnesium, Bioceramics, Vickers Hardness, Grain size, Apatite, Electrophoretic Deposition, Aquaculture, Fish Nutrition, Feed Additives, Young's modulus, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Fracture Toughness, Sintering Additives, Doped Sample, Sinterability, Magnesium Oxides, Magnesium Oxide (MgO), Two Phase Flows, Nanofluids Stability, Rheological Studies, Hydroxyapatite Based Coatings, Corrosion Behaviour, and Solgelcoating etc)
(Extracellular Matrix, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Mechanical properties, Magnesium, Bioceramics, Vickers Hardness, Grain size, Apatite, Electrophoretic Deposition, Aquaculture, Fish Nutrition, Feed Additives, Young's modulus, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Fracture Toughness, Sintering Additives, Doped Sample, Sinterability, Magnesium Oxides, Magnesium Oxide (MgO), Two Phase Flows, Nanofluids Stability, Rheological Studies, Hydroxyapatite Based Coatings, Corrosion Behaviour, and Solgelcoating etc)
Metal-organic framework MOF-5 (i.e. IRMOF-1) with the chemical structure of Zn4O(BDC)3 were successfully synthesized using room temperature synthesis approach of direct-mixing method ans liquid-crystal templating method. The metal... more
Metal-organic framework MOF-5 (i.e. IRMOF-1) with the chemical structure of Zn4O(BDC)3 were successfully synthesized using room temperature synthesis approach of direct-mixing method ans liquid-crystal templating method. The metal clusters organic linker used was benzenedicarboxylic acid (BDC). Direct-mixing approach resulted in MOF-5 with tetragonal cell while the liquid-crystal templating method resulted in cubic structure. The metal/linker ratios were varied from 0.1 to 1 to study the effect of metal linker on the formation of MOF-5 materials and their characteristics. The crystallinity of the evacuated framework MOF-5 materials were increased when the metal/organic linker ratios were increased from 0.3 to 0.5. However, the cubic structure of the evacuated framework was relatively disrupted at metal/linker ratio 0.7.
http://www.scientific.net/KEM.462-463.1103
http://www.scientific.net/KEM.462-463.1103
Research Interests: Chemical Engineering, Synthesis of nanoparticles, Membranes, Catalysis, Liquid Crystals, and 32 moreVLSI, Nanocomposites, Nanowire, Reaction engineering, Fracture Mechanics, Transport phenomena, Ionic Liquids, Solar Cells, Metal Organic Frameworks, Photonic Crystal Fibre, Biosensor, Metals, Cubic Structure, Optical fiber, Biofuel cells, Coordination Polymers, Bdcbdcmbd, Teaching Method for Sound Mixing, Crystallinities, Room Temperature Synthesis, MOF-5, Organic Linker, Crystal Templating, Organic Linkers, Coordination Reactions, Quantum Structured Laser Diodes, Shape and Control of Metallic Nanoparticles, Surface Science Phenomena (STM Imaging of Molecular Magnetic Systems, Electronic Transport In Molecules, Small Supported Clusters on Metal Oxide Surfaces), Reactor Design, and Structured Catalysis(VLSI, Nanocomposites, Nanowire, Reaction engineering, Fracture Mechanics, Transport phenomena, Ionic Liquids, Solar Cells, Metal Organic Frameworks, Photonic Crystal Fibre, Biosensor, Metals, Cubic Structure, Optical fiber, Biofuel cells, Coordination Polymers, Bdcbdcmbd, Teaching Method for Sound Mixing, Crystallinities, Room Temperature Synthesis, MOF-5, Organic Linker, Crystal Templating, Organic Linkers, Coordination Reactions, Quantum Structured Laser Diodes, Shape and Control of Metallic Nanoparticles, Surface Science Phenomena (STM Imaging of Molecular Magnetic Systems, Electronic Transport In Molecules, Small Supported Clusters on Metal Oxide Surfaces), Reactor Design, and Structured Catalysis)
(VLSI, Nanocomposites, Nanowire, Reaction engineering, Fracture Mechanics, Transport phenomena, Ionic Liquids, Solar Cells, Metal Organic Frameworks, Photonic Crystal Fibre, Biosensor, Metals, Cubic Structure, Optical fiber, Biofuel cells, Coordination Polymers, Bdcbdcmbd, Teaching Method for Sound Mixing, Crystallinities, Room Temperature Synthesis, MOF-5, Organic Linker, Crystal Templating, Organic Linkers, Coordination Reactions, Quantum Structured Laser Diodes, Shape and Control of Metallic Nanoparticles, Surface Science Phenomena (STM Imaging of Molecular Magnetic Systems, Electronic Transport In Molecules, Small Supported Clusters on Metal Oxide Surfaces), Reactor Design, and Structured Catalysis)
A new framework type LixNi2(MoO4) 3 [0 ≤ x ≤ 4] polyanion compound was synthesized via a glycine-nitrate soft-combustion process at low temperature. The annealed powders were characterized by XRD to confirm the phase formation of the... more
A new framework type LixNi2(MoO4) 3 [0 ≤ x ≤ 4] polyanion compound was synthesized via a glycine-nitrate soft-combustion process at low temperature. The annealed powders were characterized by XRD to confirm the phase formation of the stoichiometric product, Ni2(MoO4)3 in its non-lithiated state. The morphology of the annealed product was found to be composed of soft agglomerates embedded by ultrafine spherical grains. Electrochemical redox properties of the synthesized product were confirmed by employing the new material as a cathode in lithium-containing test cells in an aprotic electrolyte environment (1 M LiPF6 in EC+DMC). Slow scan cyclic voltammetry (SSCV) confirmed the redox behavior corresponding to the reduction/oxidation of the transition metals, Ni and Mo between the potential window of 3.5-1.5 V. The lithium insertion/extraction process was confirmed by galvanostatic measurements on the test cells and they exhibited well discernible discharge/charge profiles with a reversible capacity of 170 mAh/g over the potential window of 3.5-1.5 V after the first charge/discharge cycle. Nevertheless, the discharge capacity was found to deteriorate slowly upon repeated cycling, which might presumably be due to disproportion reaction of the host structure beyond the extent of insertion of two lithium ions.
http://www.sciencedirect.com/science/article/pii/S0022072804001779
http://www.sciencedirect.com/science/article/pii/S0022072804001779
Research Interests: Lithium Batteries, Internal Combustion Engines, Lithium-Ion Battery, Cathode Materials, 1453, and 13 moreOrganic Chemistry, Chemistry in Structural Engineering, Redox Reactions, Electrodes, Grain Size and Shape, 3D Framework Compounds, Nickel Molybdate, Polyanions, Nickel Compounds, K. F.; Sapkal S. B.; Kakade, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009(Organic Chemistry, Chemistry in Structural Engineering, Redox Reactions, Electrodes, Grain Size and Shape, 3D Framework Compounds, Nickel Molybdate, Polyanions, Nickel Compounds, K. F.; Sapkal S. B.; Kakade, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009)
(Organic Chemistry, Chemistry in Structural Engineering, Redox Reactions, Electrodes, Grain Size and Shape, 3D Framework Compounds, Nickel Molybdate, Polyanions, Nickel Compounds, K. F.; Sapkal S. B.; Kakade, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009)
A new framework type LixNi2(MoO4) 3 [0 ≤ x ≤ 4] polyanion compound was synthesized via a glycine-nitrate soft-combustion process at low temperature. The annealed powders were characterized by XRD to confirm the phase formation of the... more
A new framework type LixNi2(MoO4) 3 [0 ≤ x ≤ 4] polyanion compound was synthesized via a glycine-nitrate soft-combustion process at low temperature. The annealed powders were characterized by XRD to confirm the phase formation of the stoichiometric product, Ni2(MoO4)3 in its non-lithiated state. The morphology of the annealed product was found to be composed of soft agglomerates embedded by ultrafine spherical grains. Electrochemical redox properties of the synthesized product were confirmed by employing the new material as a cathode in lithium-containing test cells in an aprotic electrolyte environment (1 M LiPF6 in EC+DMC). Slow scan cyclic voltammetry (SSCV) confirmed the redox behavior corresponding to the reduction/oxidation of the transition metals, Ni and Mo between the potential window of 3.5-1.5 V. The lithium insertion/extraction process was confirmed by galvanostatic measurements on the test cells and they exhibited well discernible discharge/charge profiles with a reversible capacity of 170 mAh/g over the potential window of 3.5-1.5 V after the first charge/discharge cycle. Nevertheless, the discharge capacity was found to deteriorate slowly upon repeated cycling, which might presumably be due to disproportion reaction of the host structure beyond the extent of insertion of two lithium ions.
http://www.sciencedirect.com/science/article/pii/S0022072804001779
http://www.sciencedirect.com/science/article/pii/S0022072804001779
Research Interests: Lithium Batteries, Internal Combustion Engines, Lithium-Ion Battery, Cathode Materials, 1453, and 13 moreOrganic Chemistry, Chemistry in Structural Engineering, Redox Reactions, Electrodes, Grain Size and Shape, 3D Framework Compounds, Nickel Molybdate, Polyanions, Nickel Compounds, K. F.; Sapkal S. B.; Kakade, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009(Organic Chemistry, Chemistry in Structural Engineering, Redox Reactions, Electrodes, Grain Size and Shape, 3D Framework Compounds, Nickel Molybdate, Polyanions, Nickel Compounds, K. F.; Sapkal S. B.; Kakade, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009)
(Organic Chemistry, Chemistry in Structural Engineering, Redox Reactions, Electrodes, Grain Size and Shape, 3D Framework Compounds, Nickel Molybdate, Polyanions, Nickel Compounds, K. F.; Sapkal S. B.; Kakade, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009)
Improvement of the mechanical properties of hydroxyapatite (HA) can be achieved by the incorporation of metal. In addition, incorporation of strontium ion into HA crystal structures has been proved effective to enhance biochemical... more
Improvement of the mechanical properties of hydroxyapatite (HA) can be achieved by the incorporation of metal. In addition, incorporation of strontium ion into HA crystal structures has been proved effective to enhance biochemical properties of bone implant. In this research, strontium-doped HA powder was developed via a sol-gel method to produce extraordinarily fine strontium-doped HA (Sr-doped HA) powder. XRD measurement had shown that the powder contained hydroxyapatite phase only for all doping concentration except for 2%, showing that Sr atoms have suppressed the appearance of beta-TCP as the secondary phase. Morphological evaluation by FESEM measurement shows that the particles of the Sr-doped HA agglomerates are globular in shape with an average size of 1-2 microm in diameter while the primary particles have a diameter of 30-150 nm in average.
http://www.scopus.com/inward/record.url?eid=2-s2.0-58949093477&partnerID=40&md5=cfe253e30cbceb8e2f5d6f7597ef1351
http://www.scopus.com/inward/record.url?eid=2-s2.0-58949093477&partnerID=40&md5=cfe253e30cbceb8e2f5d6f7597ef1351
Research Interests: Mathematical Physics, Chemistry, String Theory, Effects Of Light On Humans, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, and 13 moreHuman, Powders Synthesis, Strontium, Article, Higgs physics, Gels, Powder, Gel, Hydroxyapatites, Strontium Hydroxyapatite, Unclassified Drug, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition
The use of response surface methodology for minimizing the surface roughness in machining titanium alloy, a topic of current interest, has been discussed in this article. The surface roughness model has been developed in terms of cutting... more
The use of response surface methodology for minimizing the surface roughness in machining titanium alloy, a topic of current interest, has been discussed in this article. The surface roughness model has been developed in terms of cutting parameters such as cutting speed, feed, and depth of cut. Machining tests have been carried out using CVD (TiN-TiCN-Al2O3-TiN) coated carbide insert under different cutting conditions using Taguchi's orthogonal array. The experimental results have been investigated using analysis of variance (ANOVA). The results indicated that the feed rate is the main influencing factor on surface roughness. Surface roughness increased with increasing feed rate, but decreased with increasing cutting speed and depth of cut. The predicted results are fairly close to experimental values and hence, the developed models can be used for prediction satisfactorily.
http://www.tandfonline.com/doi/abs/10.1080/10426910701774700#.UdZ2pqyTX1U
http://www.tandfonline.com/doi/abs/10.1080/10426910701774700#.UdZ2pqyTX1U
Research Interests: Artificial Intelligence, Metal Cutting, Response Surface Methodology, Numerical Analysis, Machining, and 15 moreComputational Mathematics, Surface Roughness, Simulation, Orthogonal Array, Dynamic Systems and Control, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, SEM STUDIES, Contour Plots, Analysis of Variance (ANOVA), CVD-coated Carbide Inserts, Linear Graph, Response Surface Plots, and Integration Technology of Automation Systems(Computational Mathematics, Surface Roughness, Simulation, Orthogonal Array, Dynamic Systems and Control, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, SEM STUDIES, Contour Plots, Analysis of Variance (ANOVA), CVD-coated Carbide Inserts, Linear Graph, Response Surface Plots, and Integration Technology of Automation Systems)
(Computational Mathematics, Surface Roughness, Simulation, Orthogonal Array, Dynamic Systems and Control, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, SEM STUDIES, Contour Plots, Analysis of Variance (ANOVA), CVD-coated Carbide Inserts, Linear Graph, Response Surface Plots, and Integration Technology of Automation Systems)
In this research, (X)PZT-(1-X)PMN ceramics (where X is 0.25, 0.5 and 0.75) were achieved from a conventional mixed-oxide method. Lead Zirconate titanate (PZT) powders with composition near the morphotropic phase boundary have been... more
In this research, (X)PZT-(1-X)PMN ceramics (where X is 0.25, 0.5 and 0.75) were achieved from a conventional mixed-oxide method. Lead Zirconate titanate (PZT) powders with composition near the morphotropic phase boundary have been synthesized via a microemulsion processing route. Modified mixed oxides method was used for obtaining single phase Lead Magnesium niobate (PMN) powder with high relative density (98% of T.D.) and good electrical properties (dielectric constant of ≈10 4 at room temperature). Two-step sintering (TSS) has been applied to suppress the accelerated grain growth of PZT-PMN composite compacts in the last sintering stage. The produced samples with high PZT content showed low densities due to the low compaction ratio of PZT powder. The dielectric properties of PZT-rich and PMN-rich materials were high (dielectric constant of about 0.7×10 3 and 1×10 3 was measured for PZT-rich and PMN-rich ceramics, respectively) while the other sample exhibited lower dielectric properties. The X-ray diffraction analysis of the sintered samples indicated that PZT-PMN ceramic was produced successfully with traces of pyrochlore phase formed in the structure.
http://www.scopus.com/inward/record.url?eid=2-s2.0-84859759563&partnerID=40&md5=dbfe9b73f0764c466309a1c6c69d9e1d
http://www.scopus.com/inward/record.url?eid=2-s2.0-84859759563&partnerID=40&md5=dbfe9b73f0764c466309a1c6c69d9e1d
Research Interests:
Strontium doped hydroxyapatite (Sr-doped HA) nanopowder has been synthesized using a sol-gel method. The concentration of strontium was varied at 2, 5, 10 and 15 mol%. The as synthesized powders were calcined at temperatures of 500-900°C.... more
Strontium doped hydroxyapatite (Sr-doped HA) nanopowder has been synthesized using a sol-gel method. The concentration of strontium was varied at 2, 5, 10 and 15 mol%. The as synthesized powders were calcined at temperatures of 500-900°C. The calcined white Sr-doped HA powders were characterized using differential and thermogravimetric analysis (TG/DTA), field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Morphological evaluation by FESEM measurement shows that the particles of the Sr-doped HA agglomerates are globular in shape with an average size of 1-2 mm in diameter while the primary particles have a diameter of 30-150 nm in average. The calcined powders contained hydroxyapatite phase only for all doping concentration except for the smallest doping concentration, 2 mol%, where â-TCP appeared as the secondary phase. This indicates that the substitution of Sr atoms for Ca atoms have stabilized the HA phase, leading to the inhibition of the appearance of â-TCP phase upon high temperature calcination. Even, for 2 mol% Sr-doped HA, the appearance of â-TCP peak only started to appear at a temperature as high as of 900°C, compared to non-Sr doping HA which appeared at a temperature below 800°C.
medind.nic.in/taa/t09/i2/taat09i2p105.pdf
medind.nic.in/taa/t09/i2/taat09i2p105.pdf
Research Interests: Shamanism, FTIR spectroscopy, Entheogens, Tiwanaku, Hallucinogens, and 19 moreApatite, The investigation of degradation and mineralization of high concentrations of formaldehyde in an electro-Fenton process combined with the biodegradation, Calcination Temperature, Average Grain Size, Calcined Powder, Secondary Phase, As-synthesized Powder, Doping Concentration, Field Emission Scanning Electron Microscopy, High-temperature Calcination, Phase-only, Primary Particles, TCP Phase, Snuff Powders, Anadenanthera, Graphene and Carbon Nanotechnology, Nanoelectrocrystalization, Nanostructured Powders and Surfaces, and Sensor Nanotechnology(Apatite, The investigation of degradation and mineralization of high concentrations of formaldehyde in an electro-Fenton process combined with the biodegradation, Calcination Temperature, Average Grain Size, Calcined Powder, Secondary Phase, As-synthesized Powder, Doping Concentration, Field Emission Scanning Electron Microscopy, High-temperature Calcination, Phase-only, Primary Particles, TCP Phase, Snuff Powders, Anadenanthera, Graphene and Carbon Nanotechnology, Nanoelectrocrystalization, Nanostructured Powders and Surfaces, and Sensor Nanotechnology)
(Apatite, The investigation of degradation and mineralization of high concentrations of formaldehyde in an electro-Fenton process combined with the biodegradation, Calcination Temperature, Average Grain Size, Calcined Powder, Secondary Phase, As-synthesized Powder, Doping Concentration, Field Emission Scanning Electron Microscopy, High-temperature Calcination, Phase-only, Primary Particles, TCP Phase, Snuff Powders, Anadenanthera, Graphene and Carbon Nanotechnology, Nanoelectrocrystalization, Nanostructured Powders and Surfaces, and Sensor Nanotechnology)
The nanocrystalline HA powders were produced through sol-gel method which employed calcium nitrate tetrahydrate [Ca(NO3)2.4H2O] and diammonium hydrogen phosphate [(NH4)2HPO4] as calcium and phosphorous precursors. Sodium ion (Na+) is one... more
The nanocrystalline HA powders were produced through sol-gel method which employed calcium nitrate tetrahydrate [Ca(NO3)2.4H2O] and diammonium hydrogen phosphate [(NH4)2HPO4] as calcium and phosphorous precursors. Sodium ion (Na+) is one of the trace elements found in biological apatite and believed to have important effect in its performance. The concentrations of sodium dopant were varied from 0 mol% until 15 mol% by using sodium nitrate (NaNO3) as the source of dopant. Characterization of nanopowders was investigated by using X-ray diffraction (XRD), Fourier transform infra red (FTIR) and Transmission Electron Microscope (TEM). XRD analysis revealed that there are no other phases exist in the synthesized powder, evinced single phase of HA and a trend shows an increase of cristallinity with increase of sodium dopant concentration. While the TEM images showed evidence that the particle sizes were bigger with the increasing sodium concentration, showing the effect of sodium dopant on the densification of the powder.
http://www.scientific.net/MSF.694.128
http://www.scientific.net/MSF.694.128
Research Interests:
The sintering behaviour of Y-TZP ceramics, their resulting microstructures and properties are influenced not only by the characteristics of the raw materials but also were found to be dependent on the thermal history during the... more
The sintering behaviour of Y-TZP ceramics, their resulting microstructures and properties are influenced not only by the characteristics of the raw materials but also were found to be dependent on the thermal history during the fabrication process. It is generally understood that fracture toughness increases as grain size increases up to a certain limit but in the present investigation, the results obtained challenge this view. The work is concerned with grain size dependence on the mechanical properties, in particular on the fracture toughness. Two commercially available powders based on two different processing techniques (i.e. coated and co-precipitated) were studied. It has been found that both materials exhibited different fracture toughness trends. Smaller grains of coated Y-TZP resulted in high fracture toughness > 12 MPa m1/2 while the opposite effect was seen in the co-precipitated material which showed enhanced fracture toughness with increasing grain size above a certain lower limit from a nonconventional heat treatment.
http://link.springer.com/article/10.1007%2FBF01152158
http://link.springer.com/article/10.1007%2FBF01152158
Research Interests:
In the present work, the sintering behaviour of HA particles prepared via the wet precipitation method (HAp) and wet mechanochemical technique (HAwm) was investigated. The sintering behaviour of a commercial HA powder (HAc) was also... more
In the present work, the sintering behaviour of HA particles prepared via the wet precipitation method (HAp) and wet mechanochemical technique (HAwm) was investigated. The sintering behaviour of a commercial HA powder (HAc) was also studied for comparison purpose. All the three powders were characterised in terms of particle size, Ca/P ratio and crystal size. Green samples were prepared and sintered in air at temperatures ranging from 1000 degrees C to 1400 degrees C. The sintered bodies were studied in terms of the phase stability, relative density, Young's modulus, Vickers hardness, fracture toughness and grain size. The results indicated that HAwm samples suffered phase decomposition while the HAp and HAc sintered samples showed no phase disruption throughout the temperature range employed. The HAp samples exhibited the overall best densification and properties when compared to the HAc and HAwm samples. Furthermore, the results showed that mechanical properties of sintered samples were governed by both the bulk density and the grain size.
http://ac.els-cdn.com/S0272884212005123/1-s2.0-S0272884212005123-main.pdf?_tid=b5fed1cc-e777-11e2-8dd4-00000aacb35e&acdnat=1373251391_058bd8e278c7c581214ffe34cd632cf8
http://ac.els-cdn.com/S0272884212005123/1-s2.0-S0272884212005123-main.pdf?_tid=b5fed1cc-e777-11e2-8dd4-00000aacb35e&acdnat=1373251391_058bd8e278c7c581214ffe34cd632cf8
Research Interests: Organizational Behavior, Biochemistry, Medicinal Chemistry, Mechanical Properties of Ceramics, Ceramics (Archaeology), and 12 moreBioinorganic Chemistry, HIGH TEMPERATURE SUPERCONDUCTIVITY, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Thermal Stability of Nuclear Reactor, Organic Synthesis, Biomedical applications, Sinterability, Nanocrystalline Hydroxyapatite, Mechanical-properties, Calcium-phosphate Apatites, Wet-chemical-synthesis, and Atomic Ratio(Bioinorganic Chemistry, HIGH TEMPERATURE SUPERCONDUCTIVITY, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Thermal Stability of Nuclear Reactor, Organic Synthesis, Biomedical applications, Sinterability, Nanocrystalline Hydroxyapatite, Mechanical-properties, Calcium-phosphate Apatites, Wet-chemical-synthesis, and Atomic Ratio)
(Bioinorganic Chemistry, HIGH TEMPERATURE SUPERCONDUCTIVITY, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Thermal Stability of Nuclear Reactor, Organic Synthesis, Biomedical applications, Sinterability, Nanocrystalline Hydroxyapatite, Mechanical-properties, Calcium-phosphate Apatites, Wet-chemical-synthesis, and Atomic Ratio)
In the present work, densification of synthesised hydroxyapatite (HA) bioceramic prepared via chemical precipitation method was investigated. HA samples was prepared by compaction at 200 MPa and sintered at temperatures ranging from 800°C... more
In the present work, densification of synthesised hydroxyapatite (HA) bioceramic prepared via chemical precipitation method was investigated. HA samples was prepared by compaction at 200 MPa and sintered at temperatures ranging from 800°C to 1400°C. The results revealed that the HA phase was stable for up to sintering temperature of 1250°C. However, decomposition of HA was observed in samples sintered at 1300°C with the formation of tetra-calcium phosphate (TTCP) and CaO. Samples sintered above 1400°C were found to melt into glassy phases. The bulk density increases with increasing temperature and attained a maximum value of 3.14 gcm-3 at 1150°C whereas maximum hardness value of 6.64 GPa was measured in HA sintered at 1050°C. These results are discussed in terms of the role of grain size.
http://www.scientific.net/AMR.264-265.1856
http://www.scientific.net/AMR.264-265.1856
Research Interests: Sintering, Powder Metallurgy, Biomaterials, Hydroxyapatite, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, and 22 moreAlumina, Mechanical Alloying, Forsterite, Apatite, Grain size distribution, Gene Delivery, Calcium Phosphate, Bioceramic, Titanium alloys, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Chemical Precipitation, Wet-chemical Method, Sintering Temperatures, Maximum Hardnesses, Chemical Precipitation Method, Maximum Values, Glassy Phasis, Ceramics Composites, Porous Metals, Hard Tissue Engineering, Ceramics (Zirconia, and Steatite)(Alumina, Mechanical Alloying, Forsterite, Apatite, Grain size distribution, Gene Delivery, Calcium Phosphate, Bioceramic, Titanium alloys, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Chemical Precipitation, Wet-chemical Method, Sintering Temperatures, Maximum Hardnesses, Chemical Precipitation Method, Maximum Values, Glassy Phasis, Ceramics Composites, Porous Metals, Hard Tissue Engineering, Ceramics (Zirconia, and Steatite))
(Alumina, Mechanical Alloying, Forsterite, Apatite, Grain size distribution, Gene Delivery, Calcium Phosphate, Bioceramic, Titanium alloys, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Chemical Precipitation, Wet-chemical Method, Sintering Temperatures, Maximum Hardnesses, Chemical Precipitation Method, Maximum Values, Glassy Phasis, Ceramics Composites, Porous Metals, Hard Tissue Engineering, Ceramics (Zirconia, and Steatite))
The effects of doping small amounts of TiO2 up to 5 wt% on the sintering behaviour of alumina (Al2O3) was studied. Green samples were prepared and pressureless sintered in air at temperatures ranging from 1250°C to 1600°C, at a furnace... more
The effects of doping small amounts of TiO2 up to 5 wt% on the sintering behaviour of alumina (Al2O3) was studied. Green samples were prepared and pressureless sintered in air at temperatures ranging from 1250°C to 1600°C, at a furnace ramp rate of 10°C/min. and soaking time of 2 hours. Sintered samples were characterized to determine bulk density, hardness and Young's modulus. It has been found that all the doped samples exhibited higher bulk density than the undoped samples. The bulk density increases with increasing temperature and attained a maximum value of 3.9 Mgm-3 for samples doped with 1.0 wt% TiO2 at 1450°C. The addition of 1 wt% TiO2 when sintered at 1450°C was found to be the most beneficial throughout the studied range as the samples exhibited the highest Young's modulus of 381 GPa and Vickers hardness of 16.5 GPa as compared to 256.7 GPa and 11.2 GPa for the undoped alumina. Titanium oxide doping is one economical way of improving the densification of Al2O3 without affecting mechanical properties.
http://link.springer.com/chapter/10.1007/978-3-540-69139-6_89
http://link.springer.com/chapter/10.1007/978-3-540-69139-6_89
Research Interests: Mechanical Properties of Ceramics, ZnO,TiO2 nanowires, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Biodegradable Polymers for Biomedical Applications, Ellectrospinning, Alumina, and 12 moreYoung's Modulus of Ceramic, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Spray deposited titanium oxide thin films as passive counter electrodes, Sintered Samples, Sintering Behaviour, Doped Sample, Green Samples, Ramp Rates, Pressureless-sintered, Doped Alumina, Maximum Values, and Soaking Time(Young's Modulus of Ceramic, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Spray deposited titanium oxide thin films as passive counter electrodes, Sintered Samples, Sintering Behaviour, Doped Sample, Green Samples, Ramp Rates, Pressureless-sintered, Doped Alumina, Maximum Values, and Soaking Time)
(Young's Modulus of Ceramic, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, Spray deposited titanium oxide thin films as passive counter electrodes, Sintered Samples, Sintering Behaviour, Doped Sample, Green Samples, Ramp Rates, Pressureless-sintered, Doped Alumina, Maximum Values, and Soaking Time)
The sintering behaviour of alumina-Y-TZP composites prepared by slip-casting technique were studied. Slip-cast samples containing varying amounts of Y-TZP ranging up to 90 vol% were prepared and evaluated. Sintering studies were carried... more
The sintering behaviour of alumina-Y-TZP composites prepared by slip-casting technique were studied. Slip-cast samples containing varying amounts of Y-TZP ranging up to 90 vol% were prepared and evaluated. Sintering studies were carried out at 1450 degrees C to 1600 degrees C. Sintered samples were characterised where appropriate to determine phases present, grain sizes, bulk density and mechanical properties. Good correlation was obtained between the calculated prepared powder density and experimental results. The sintered bulk density of the composites was observed to increase with increasing Y-TZP content and sintering temperature up to 1550 degrees C. Maximum hardness values (> 14 GPa) were obtained for all samples containing < 60 vol% Y-TZP and when sintered at 1550 degrees C. It has been found that the additions of up to 50 vol% Y-TZP was effective in suppressing Al2O3 grain growth.
http://link.springer.com/content/pdf/10.1023%2FA%3A1004837516291.pdf
http://link.springer.com/content/pdf/10.1023%2FA%3A1004837516291.pdf
Research Interests:
The sintering behaviour of a commercial HA and synthesized HA was investigated over the temperature range of 700 degrees C to 1400 degrees C in terms of phase stability, bulk density, Young's modulus and Vickers hardness. In the present... more
The sintering behaviour of a commercial HA and synthesized HA was investigated over the temperature range of 700 degrees C to 1400 degrees C in terms of phase stability, bulk density, Young's modulus and Vickers hardness. In the present research, a wet chemical precipitation reaction was successfully employed to synthesize a submicron, highly crystalline, high purity and single phase stoichiometric HA powder that is highly sinteractive particularly at low temperature regimes below 1100 degrees C. It has been revealed that the sinterability of the synthesized HA was significantly greater than that of the commercial HA. The temperature for the onset of sintering and the temperature required to achieve densities above 98% of theoretical value were approximately 150 degrees C lower for the synthesized HA than the equivalent commercial HA. Nevertheless, decomposition of HA phase upon sintering was not observed in the present work for both powders.
http://www.ncbi.nlm.nih.gov/pubmed/19024998
http://www.ncbi.nlm.nih.gov/pubmed/19024998
Research Interests: Biochemistry, Mathematical Physics, Human Computer Interaction, Chemistry, Powder Metallurgy, and 33 moreMedicinal Chemistry, Biomaterials, String Theory, Nanoparticles, 3D printing, Comparative Study, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Organic Synthesis, Ceramics, Heart, Article, Lay concepts of psychosis in Busoga, Eastern Uganda: A pilot Study, Higgs physics, Hardness removal, Particle, Rats, Morphology tuning and surface property tunning of Nanomaterials, Bone Prosthesis, Materials Testing, RP Technologies, Process Parameters, Post Processing, Tensile Strength, Drying Process and Technology, Spray Drying, Fluidised bed Dryer, Solid Phase Crystallization, Theoretical High Energy Physics : Supersymmetry, Cosmological Phase Transition, Biocompatible Materials, Drug Carriers, and Silicon Dioxide(Medicinal Chemistry, Biomaterials, String Theory, Nanoparticles, 3D printing, Comparative Study, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Organic Synthesis, Ceramics, Heart, Article, Lay concepts of psychosis in Busoga, Eastern Uganda: A pilot Study, Higgs physics, Hardness removal, Particle, Rats, Morphology tuning and surface property tunning of Nanomaterials, Bone Prosthesis, Materials Testing, RP Technologies, Process Parameters, Post Processing, Tensile Strength, Drying Process and Technology, Spray Drying, Fluidised bed Dryer, Solid Phase Crystallization, Theoretical High Energy Physics : Supersymmetry, Cosmological Phase Transition, Biocompatible Materials, Drug Carriers, and Silicon Dioxide)
(Medicinal Chemistry, Biomaterials, String Theory, Nanoparticles, 3D printing, Comparative Study, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Organic Synthesis, Ceramics, Heart, Article, Lay concepts of psychosis in Busoga, Eastern Uganda: A pilot Study, Higgs physics, Hardness removal, Particle, Rats, Morphology tuning and surface property tunning of Nanomaterials, Bone Prosthesis, Materials Testing, RP Technologies, Process Parameters, Post Processing, Tensile Strength, Drying Process and Technology, Spray Drying, Fluidised bed Dryer, Solid Phase Crystallization, Theoretical High Energy Physics : Supersymmetry, Cosmological Phase Transition, Biocompatible Materials, Drug Carriers, and Silicon Dioxide)
With the assistance of heat treatment, forsterite (Mg 2SiO 4) powder was successfully synthesized using talc and magnesium oxide as the basic starting materials. Sintering behavior and mechanical properties were evaluated upon sintering... more
With the assistance of heat treatment, forsterite (Mg 2SiO 4) powder was successfully synthesized using talc and magnesium oxide as the basic starting materials. Sintering behavior and mechanical properties were evaluated upon sintering the synthesized forsterite compacts from 1200 °C to 1500 °C. Forsterite phase without any secondary phase were observed at all sintering temperatures analyzed by X-ray diffractometer (XRD). Results also showed that relative density of 90.7% was obtained at sintering temperature of 1500 °C. Optimal fracture toughness (4.88 MPa.m 1/2) and Vickers micro-hardness (7.11 GPa) were achieved when sintered at 1400 °C.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6136415&tag=1
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6136415&tag=1
Research Interests: Natural Fibre Composites, Fracture Mechanics, Mechanical properties, Alumina, Polymer Composites, and 11 moreMaterials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Forsterite, Zirconia, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Fracture Toughness, Sintering Behaviors, Forsterites, Secondary Phase, Vickers Microhardness, X Ray Diffractometers, and Bio Meterial (Hydroxyapatite(Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Forsterite, Zirconia, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Fracture Toughness, Sintering Behaviors, Forsterites, Secondary Phase, Vickers Microhardness, X Ray Diffractometers, and Bio Meterial (Hydroxyapatite)
(Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Forsterite, Zirconia, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Fracture Toughness, Sintering Behaviors, Forsterites, Secondary Phase, Vickers Microhardness, X Ray Diffractometers, and Bio Meterial (Hydroxyapatite)
The sintering behaviour of three different HA, i.e. a commercial HA(C) and synthesized HA by wet precipitation, HA(W) and mechanochemical method, HA(M) were investigated over the temperature range of 1000°C to 1350°C. In the present... more
The sintering behaviour of three different HA, i.e. a commercial HA(C) and synthesized HA by wet precipitation, HA(W) and mechanochemical method, HA(M) were investigated over the temperature range of 1000°C to 1350°C. In the present research, a wet chemical precipitation reaction was successfully employed to synthesize highly crystalline, high purity and single phase stoichiometric HA powder that is highly sinteractive particularly at low temperatures below 1100°C. It has been revealed that the sinterability and mechanical properties of the synthesized HA by this method was significantly higher than that of the commercial material and HA which was synthesized by mechanochemical method. The optimum sintering temperature for the synthesized HA(W) was 1100°C with the following properties being recorded: 99.8% relative density, Vickers hardness of 7.04 GPa and fracture toughness of 1.22 MPam1/2. In contrast, the optimum sintering temperature for the commercial HA(C) and synthesized HA(M) was 1300°C with relative density of 98% and 95.5%, Vickers hardness of 5.47 GPa and 4.73 GPa, fracture toughness of 0.75 MPam1/2 and 0.82 MPam1/2 being measured, respectively.
http://onlinelibrary.wiley.com/doi/10.1002/9780470584354.ch12/summary
http://onlinelibrary.wiley.com/doi/10.1002/9780470584354.ch12/summary
Research Interests: Hydroxyapatite, Shamanism, Entheogens, Tiwanaku, Alumina, and 17 moreHallucinogens, Forsterite, Single Phase Motor, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Low Temperatures, project materials on the roles of commercial banks in d economic development of rural areas in Nigeria, Temperature Range, High Purity, Sintering Behaviors, Sintering Temperatures, Mechanochemical Method, Sinterability, Snuff Powders, Anadenanthera, Ceramics Composites, Ceramics (Zirconia, and Steatite)(Hallucinogens, Forsterite, Single Phase Motor, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Low Temperatures, project materials on the roles of commercial banks in d economic development of rural areas in Nigeria, Temperature Range, High Purity, Sintering Behaviors, Sintering Temperatures, Mechanochemical Method, Sinterability, Snuff Powders, Anadenanthera, Ceramics Composites, Ceramics (Zirconia, and Steatite))
(Hallucinogens, Forsterite, Single Phase Motor, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Low Temperatures, project materials on the roles of commercial banks in d economic development of rural areas in Nigeria, Temperature Range, High Purity, Sintering Behaviors, Sintering Temperatures, Mechanochemical Method, Sinterability, Snuff Powders, Anadenanthera, Ceramics Composites, Ceramics (Zirconia, and Steatite))
Dense manganese-doped biphasic calcium phosphate (Mn-BCP) ceramics were fabricated via uniaxial pressing using the sol-gel derived powders. The compacted discs were sintered in ambient atmosphere with temperatures ranging from 800C to... more
Dense manganese-doped biphasic calcium phosphate (Mn-BCP) ceramics were fabricated via uniaxial pressing using the sol-gel derived powders. The compacted discs were sintered in ambient atmosphere with temperatures ranging from 800C to 1400C. Manganese (Mn) level was varied in the range of 0.6, 1.9, 4.3, and 11.9mol%, and its effect on physical and mechanical properties of the dense samples were investigated. All dense samples have been proved to show HA and -TCP phases only. Mn doping has shifted the onset of the sintering temperature of the BCP, leading to the improved densification of BCP ceramics. The relative density also increased with sintering temperature. Considerable grain growth has been observed for Mn-doped BCP samples when compared to the undoped BCP. Furthermore, 11.9mol% Mn-doped BCP dense samples showed the maximum hardness of 6.66GPa compared to 2.89GPa for the undoped BCP. The incorporation of Mn was also found to be beneficial in enhancing the fracture toughness of BCP throughout the temperature range employed. This study has shown that Mn doping was effective in improving the sintering properties of BCP without affecting the phase stability.
http://www.tandfonline.com/doi/pdf/10.1080/10426914.2011.557285
http://www.tandfonline.com/doi/pdf/10.1080/10426914.2011.557285
Research Interests: Mechanical Engineering, Biomaterials, Nanomaterials Characterization, Nanomaterials, Manganese, and 16 morePhysical and Mechanical Properties of Polymers, Ceramics, Mn doping, High quantum yield, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Influence of Co-dopant on properties of Giant Magneto-Resistance, Biphasic Calcium Phosphates, Sintering Temperatures, Maximum Hardnesses, Ambient Atmosphere, Mn-doped, Sintering Properties, Sol-gel Derived Powders, Graphene and Carbon Nanotechnology, Nanoelectrocrystalization, Nanostructured Powders and Surfaces, and Sensor Nanotechnology(Physical and Mechanical Properties of Polymers, Ceramics, Mn doping, High quantum yield, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Influence of Co-dopant on properties of Giant Magneto-Resistance, Biphasic Calcium Phosphates, Sintering Temperatures, Maximum Hardnesses, Ambient Atmosphere, Mn-doped, Sintering Properties, Sol-gel Derived Powders, Graphene and Carbon Nanotechnology, Nanoelectrocrystalization, Nanostructured Powders and Surfaces, and Sensor Nanotechnology)
(Physical and Mechanical Properties of Polymers, Ceramics, Mn doping, High quantum yield, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, Influence of Co-dopant on properties of Giant Magneto-Resistance, Biphasic Calcium Phosphates, Sintering Temperatures, Maximum Hardnesses, Ambient Atmosphere, Mn-doped, Sintering Properties, Sol-gel Derived Powders, Graphene and Carbon Nanotechnology, Nanoelectrocrystalization, Nanostructured Powders and Surfaces, and Sensor Nanotechnology)
Hydroxyapatite (HA) has been extensively studied for its exceptional ability in promoting osseointegration as in bone graft substitute and biomimetic coating of prosthetic implants. However poor mechanical properties of HA, in particular... more
Hydroxyapatite (HA) has been extensively studied for its exceptional ability in promoting osseointegration as in bone graft substitute and biomimetic coating of prosthetic implants. However poor mechanical properties of HA, in particular its low fracture toughness, has made its widespread adaption in a number of biomedical applications challenging. Here we employ an optimized wet precipitation method to synthesize nanocrystalline HA with significantly improved mechanical properties. In addition doping by MgO is found to effectively suppress grain growth and enhance fracture toughness by nearly 50% while good densification and phase stability in all samples regardless of concentration of dopant are fully maintained. Microstructural analysis further suggests that the exceptionally superior mechanical properties can be explained by migration of MgO to grain boundaries where they transform the more common transgranular fracture into an intergranular mode. Our biodegradation tests also confirm that MgO-doped HA is indeed a suitable candidate for load bearing implants.
Research Interests: Biochemistry, Medicinal Chemistry, Mechanical Properties of Ceramics, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, and 3 moreOrganic Synthesis, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, and Sinterability
In the present research, nano hydroxyapatite (HA) powder doped with magnesia (MgO) was studied. The dopant was added to pure HA powder and ball milling was done for 1 hour. Green samples, in the form of discs and rectangular bars, were... more
In the present research, nano hydroxyapatite (HA) powder doped with magnesia (MgO) was studied. The dopant was added to pure HA powder and ball milling was done for 1 hour. Green samples, in the form of discs and rectangular bars, were prepared and consolidated in air at temperatures ranging from 1000 °C to 1300 °C. The sintered samples were characterized to determine the phase stability, relative density, hardness, fracture toughness and Young's modulus. The phase analysis revealed that the HA phase was not disrupted regardless of dopant additions and sintering temperature. It has been revealed that all HA samples achieved >98% relative density when sintered between 1100 °C-1300 °C. However, the addition of 0.5 wt% MgO when sintered at 1100 °C was found to be most beneficial in aiding sintering with samples exhibiting the highest Young's modulus of 122.15 GPa and fracture toughness of 1.64 MPa m1/2 as compared to 116.57 GPa and 1.18 MPa m 1/2 for the undoped HA.
http://www.ingentaconnect.com/content/asp/asl/2012/00000014/00000001/art00051
http://www.ingentaconnect.com/content/asp/asl/2012/00000014/00000001/art00051
Research Interests:
The effect of holding time variation and sintering temperature on the mechanical properties and sinterability of yttria stabilized tetragonal zirconia doped with 1 wt. % MnO2 was investigated. Samples were sintered at 1150-1500 °C with... more
The effect of holding time variation and sintering temperature on the mechanical properties and sinterability of yttria stabilized tetragonal zirconia doped with 1 wt. % MnO2 was investigated. Samples were sintered at 1150-1500 °C with holding times varying from 12 and 120 minutes. Comparing to the MnO2-doped Y-TZP, longer holding time resulted in enhanced densification of the undoped Y-TZP samples. In the case of MnO2-doped Y-TZP however, Bulk density, Young’s modulus, Vickers hardness and fracture toughness results show the beneficial effect of MnO2 in enhancing the densification of Y-TZP ceramics.
http://www.scientific.net/AMM.110-116.1284
http://www.scientific.net/AMM.110-116.1284
Research Interests:
The effect of rapid sintering by microwave heating on the properties of nanocrystalline hydroxyapatite (HA) bioceramic powder was studied. The starting high-purity nano HA crystals was synthesized using a wet chemical precipitation... more
The effect of rapid sintering by microwave heating on the properties of nanocrystalline hydroxyapatite (HA) bioceramic powder was studied. The starting high-purity nano HA crystals was synthesized using a wet chemical precipitation technique. The HA compacts were microwave-sintered over the temperature range 1000-1300 °C, using a rapid sintering schedule of 30 min for each temperature. Shrinkage of all compacts was uniform and the sintered material did not exhibit any cracks. XRD phase analysis indicated that the HA phase stability was not disrupted throughout the sintering regime employed. A relative density of 90-91% was attained for samples sintered at 1000 °C, whereas a higher relative density of above 96% and ∼98% was measured for HA sintered at 1100 °C and 1300 °C, respectively. The present work revealed that microwave heating was beneficial in preventing grain growth, particularly when sintered at temperatures <1200 °C, and coupled with improved mechanical properties, i.e., high fracture toughness of 1.45 MPa m 1/2 and hardness of 6.38 GPa were measured for HA compacts sintered at 1050 °C and 1150 °C,
http://ac.els-cdn.com/S027288420600215X/1-s2.0-S027288420600215X-main.pdf?_tid=a264fe2a-e777-11e2-bd3d-00000aab0f02&acdnat=1373251358_e01cb1b6a6cfd5e9afc8955bbe208d43
http://ac.els-cdn.com/S027288420600215X/1-s2.0-S027288420600215X-main.pdf?_tid=a264fe2a-e777-11e2-bd3d-00000aab0f02&acdnat=1373251358_e01cb1b6a6cfd5e9afc8955bbe208d43
Research Interests: Mechanical Properties of Ceramics, Hydroxyapatite, Microwave Sintering of Metals, Nano-bioceramics for prosthetic implants through tissue engineering, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, and 6 moreMicrowave Heating, Urban Densification, Nanocrystalline Electro Ceramic Materials,Polymer Composites, X ray diffraction, High Temperature Effects, and Rapid Densification
The properties of porous hydroxyapatite (HA) bioceramic produced by heat treatment (annealing) of bovine bone were evaluated over temperatures between 400 T and 1200 T. The annealed body was characterized by thermal analysis... more
The properties of porous hydroxyapatite (HA) bioceramic produced by heat treatment (annealing) of bovine bone were evaluated over temperatures between 400 T and 1200 T. The annealed body was characterized by thermal analysis (thermogravimetric analysis (TG)/differential thermal analysis (DTA)), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and Fourier transformed infrared (FTIR) spectroscopy. The XRD results showed that the annealing process enhanced the crystallinity of HA phase in the bone matrix particularly when annealed above 700 degrees C. There was no secondary phase formation in bones annealed between 600 degrees C and 1000 T. However, decomposition of HA to P-tricalcium phosphate (TCP) was observed for samples heat-treated at 1100 degrees C and 1200 degrees C. The FTIR spectra and the TG/DTA thermogram of as-received bovine bone indicated the presence of organic compounds, which upon annealing at temperatures above 600 T was completely removed from the matrices. Bovine bone annealed between 800 degrees C and 1000 degrees C revealed the characteristics of a natural bone with the interconnecting pore network being retained in the structure.
http://ac.els-cdn.com/S0272884206001581/1-s2.0-S0272884206001581-main.pdf?_tid=a8a80a70-e777-11e2-bed9-00000aab0f02&acdnat=1373251369_464deb31602df9bf8fde7b74324703c4
http://ac.els-cdn.com/S0272884206001581/1-s2.0-S0272884206001581-main.pdf?_tid=a8a80a70-e777-11e2-bed9-00000aab0f02&acdnat=1373251369_464deb31602df9bf8fde7b74324703c4
Research Interests: Economic Growth, Composites, Hydroxyapatite, Phosphate Analysis, Ceramics (Archaeology), and 7 moreTissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Ancient Glass, Meta-Heuristics (Tabu Search, Genetic Algorithms, Simulated Annealing, Ant-Colony, Particle Swarm Optimization), Physicochemical Characterization, Natural bone accumulation, Bovine Bone, and Mechanical-properties(Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Ancient Glass, Meta-Heuristics (Tabu Search, Genetic Algorithms, Simulated Annealing, Ant-Colony, Particle Swarm Optimization), Physicochemical Characterization, Natural bone accumulation, Bovine Bone, and Mechanical-properties)
(Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Ancient Glass, Meta-Heuristics (Tabu Search, Genetic Algorithms, Simulated Annealing, Ant-Colony, Particle Swarm Optimization), Physicochemical Characterization, Natural bone accumulation, Bovine Bone, and Mechanical-properties)
In the present work, 3 mol% Yttria-stabilized tetragonal zirconia (Y-TZP) composite containing 25 wt.% of zirconium diboride (ZrB2) was prepared via pressureless sintering method in an inert atmosphere over the temperature range of... more
In the present work, 3 mol% Yttria-stabilized tetragonal zirconia (Y-TZP) composite containing 25 wt.% of zirconium diboride (ZrB2) was prepared via pressureless sintering method in an inert atmosphere over the temperature range of 1350-1550°C for one hour. The effect of zirconium diboride content in the zirconia matrix, as well as the sintering temperature on densification, phase stability and electrical properties of sintered samples have been studied. The results revealed that there was a significant increased in electrical conductivity of sintered samples when 25 wt.% of ZrB2 is incorporated into Y-TZP matrix.
http://www.scientific.net/MSF.694.304
http://www.scientific.net/MSF.694.304
Research Interests: Sintering, Computational Fluid Dynamics, Heat Transfer, Nanotechnology, Metal Matrix Composites, and 25 moreNanoscience, Pressureless Sintering, Yttria-stabilized zirconia, Urban Densification, Zirconia, Electrical Conductivity, Zirconium-Diboride, Zirconium, Sintered Samples, Temperature Range, Tetragonal Zirconia Polycrystals, Sintering Temperatures, Yttria-stabilized Tetragonal Zirconia, Inert Atmospheres, Zirconia Matrix, Borides, Yttrium Alloys, Zirconium Compounds, What Is the Effect of Nutrient Values on Ph Value, Total Desolved Solods, Disolved Oxygen, Biological Disolved Oxygen, Two Phase Flows, Nanofluids Stability, and Rheological Studies(Nanoscience, Pressureless Sintering, Yttria-stabilized zirconia, Urban Densification, Zirconia, Electrical Conductivity, Zirconium-Diboride, Zirconium, Sintered Samples, Temperature Range, Tetragonal Zirconia Polycrystals, Sintering Temperatures, Yttria-stabilized Tetragonal Zirconia, Inert Atmospheres, Zirconia Matrix, Borides, Yttrium Alloys, Zirconium Compounds, What Is the Effect of Nutrient Values on Ph Value, Total Desolved Solods, Disolved Oxygen, Biological Disolved Oxygen, Two Phase Flows, Nanofluids Stability, and Rheological Studies)
(Nanoscience, Pressureless Sintering, Yttria-stabilized zirconia, Urban Densification, Zirconia, Electrical Conductivity, Zirconium-Diboride, Zirconium, Sintered Samples, Temperature Range, Tetragonal Zirconia Polycrystals, Sintering Temperatures, Yttria-stabilized Tetragonal Zirconia, Inert Atmospheres, Zirconia Matrix, Borides, Yttrium Alloys, Zirconium Compounds, What Is the Effect of Nutrient Values on Ph Value, Total Desolved Solods, Disolved Oxygen, Biological Disolved Oxygen, Two Phase Flows, Nanofluids Stability, and Rheological Studies)
Hydroxyapatite (HA), is among the leading ceramic materials for hard tissue replacement implants. Despite the excellent bioactivity of HA, low toughness has limited the application of these materials to non-load bearing areas. The... more
Hydroxyapatite (HA), is among the leading ceramic materials for hard tissue replacement implants. Despite the excellent bioactivity of HA, low toughness has limited the application of these materials to non-load bearing areas. The sinterability of nanocrystalline hydroxyapatite (HA) powder via new heating profile for conventional pressureless sintering was studied. The starting nanocrystalline HA powder was synthesized by wet chemical precipitation method. After uniaxial pressing followed by isostatic pressing, HA powder compacts are sintered over the temperature range of 1000°C to 1300°C. Different holding time of 1 minute and 120 minutes was applied as a heating profile of HA samples. The results revealed that new heating profile was effective in producing a HA body with high density of 98% when sintered at 1200°C. Subsequently, mechanical properties such as fracture toughness and hardness, of HA compacts increased with decrease in grain size. HA showed the highest hardness of 9.51 GPa and fracture toughness of 1.41 MPa.m 1/2 when sintered at 1100°C. XRD analysis indicated that decomposition of HA phase during sintering at high temperatures (> 1200°C) do not occur. Short holding time of 1 minutes led to finer (< 0.1 μm) microstructure of HA and subsequently better mechanical properties.
http://www.scopus.com/inward/record.url?eid=2-s2.0-84859780638&partnerID=40&md5=7cefa640bcdb6be6067dc166467fff8f
http://www.scopus.com/inward/record.url?eid=2-s2.0-84859780638&partnerID=40&md5=7cefa640bcdb6be6067dc166467fff8f
Research Interests:
Hydroxyapatite (HA) has been used clinically for many years. It has good biocompatibility in bone contact as its chemical composition is similar to that of bone material. Porous HA ceramics have found enormous use in biomedical... more
Hydroxyapatite (HA) has been used clinically for many years. It has good biocompatibility in bone contact as its chemical composition is similar to that of bone material. Porous HA ceramics have found enormous use in biomedical applications including bone tissue regeneration, cell proliferation, and drug delivery. In bone tissue engineering it has been applied as filling material for bone defects and augmentation, artificial bone graft material, and prosthesis revision surgery. Its high surface area leads to excellent osteoconductivity and resorbability providing fast bone ingrowth. Porous HA can be produced by a number of methods including conversion of natural bones, ceramic foaming technique, polymeric sponge method, gel casting of foams, starch consolidation, microwave processing, slip casting, and electrophoretic deposition technique. Some of these methods have been combined to fabricate porous HA with improved properties. These combination methods have yielded some promising results. This paper discusses briefly fundamental aspects of porous HA for artificial bone applications as well as various techniques used to prepare porous HA. Some of our recent results on development of porous HA will be presented as well.
http://www.sciencedirect.com/science/article/pii/S1468699606002348
http://www.sciencedirect.com/science/article/pii/S1468699606002348
Research Interests: Bioarchaeology, Paleopathology, Tissue Engineering, Hydroxyapatite, Meta-Analysis and Systematic Review, and 15 moreCapillary electrophoresis, Cell Proliferation and Neurogenesis, Porous Materials, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Biocompatibility, Musculoskeletal Stress Markers (MSM), Drug Stability, Controlled Release Drug Delivery, Prodrugs, Preparation, GNSS Augmentation, Precise Positioning, Activity patterns, Cells, Long Bone Biomechanics, Artificial Bone Applications, Bone Tissue Regeneration, and Human Rehabilitation Equipment(Capillary electrophoresis, Cell Proliferation and Neurogenesis, Porous Materials, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Biocompatibility, Musculoskeletal Stress Markers (MSM), Drug Stability, Controlled Release Drug Delivery, Prodrugs, Preparation, GNSS Augmentation, Precise Positioning, Activity patterns, Cells, Long Bone Biomechanics, Artificial Bone Applications, Bone Tissue Regeneration, and Human Rehabilitation Equipment)
(Capillary electrophoresis, Cell Proliferation and Neurogenesis, Porous Materials, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Biocompatibility, Musculoskeletal Stress Markers (MSM), Drug Stability, Controlled Release Drug Delivery, Prodrugs, Preparation, GNSS Augmentation, Precise Positioning, Activity patterns, Cells, Long Bone Biomechanics, Artificial Bone Applications, Bone Tissue Regeneration, and Human Rehabilitation Equipment)
Hydroxyapatite containing yttria-tetragonal zirconia polycrystals (Y-TZP) with different concentrations were prepared by using the conventional ball-milling technique. Samples prepared from these powders were compacted and sintered at... more
Hydroxyapatite containing yttria-tetragonal zirconia polycrystals (Y-TZP) with different concentrations were prepared by using the conventional ball-milling technique. Samples prepared from these powders were compacted and sintered at three different temperatures (1250°C, 1400°C and 1600°C). The sintering behaviour of the composites were studied in terms of phase stability, densification and microstructural evolution. By X-ray diffraction, tetragonal zirconia as wall as HA was identified as the major phases in the composites. In addition, small diffraction peaks corresponding to α-TCP was evident indicating sign of HA decomposition. Reaction between the zirconia and HA to form CaZrO2 was also detected in the composite system containing up to 20 wt% Y-TZP.SEM examination of the sintered composites at room temperature suggested the involvement of a reactive liquid phase during sintering. The presence of zirconia phase in hydroxyapatite matrix played an important role in the stability of the HA phase.
http://www.worldscientific.com/doi/abs/10.4015/S1016237201000091
http://www.worldscientific.com/doi/abs/10.4015/S1016237201000091
Research Interests: Biomedical Engineering, Sintering, Composite Materials and Structures, Nonlinear dynamics, Scanning Electron Microscopy, and 16 moreDensity-functional theory, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Temperature, Bifurcation, Chemical Analysis, Article, Urban Densification, Yttrium, Temperature Sensitivity in Composite Propellants, Investigation of lead and tilt angle effects in 5-axis ball-end milling processes, Zirconia, Zirconium oxide, Stability and Chaos, Tetragonal Zirconia Polycrystals, and Microstructural Development(Density-functional theory, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Temperature, Bifurcation, Chemical Analysis, Article, Urban Densification, Yttrium, Temperature Sensitivity in Composite Propellants, Investigation of lead and tilt angle effects in 5-axis ball-end milling processes, Zirconia, Zirconium oxide, Stability and Chaos, Tetragonal Zirconia Polycrystals, and Microstructural Development)
(Density-functional theory, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Temperature, Bifurcation, Chemical Analysis, Article, Urban Densification, Yttrium, Temperature Sensitivity in Composite Propellants, Investigation of lead and tilt angle effects in 5-axis ball-end milling processes, Zirconia, Zirconium oxide, Stability and Chaos, Tetragonal Zirconia Polycrystals, and Microstructural Development)
The effect of manganese oxide on the sintering of steatite-based ceramic was studied. Steatite powder used in this work was doped with varying amounts of manganese oxide-5% to 30% (wt). The green samples were cold-isostatically pressed... more
The effect of manganese oxide on the sintering of steatite-based ceramic was studied. Steatite powder used in this work was doped with varying amounts of manganese oxide-5% to 30% (wt). The green samples were cold-isostatically pressed and pressureless sintered at temperatures ranging from 950°C to 1150°C using varying holding times. X-ray diffraction analysis revealed no secondary phases detected in any samples regardless of dopant addition and sintering conditions. It was revealed that the bulk density of steatite ceramic increased with manganese oxide when sintering at 1050°C. However, sintering at 1100°C using 1 minute holding time was found to be the most effective in enhancing the bulk density as well as the Vickers hardness of manganese oxide-doped steatite ceramic.
http://umpir.ump.edu.my/1655/
http://umpir.ump.edu.my/1655/
Research Interests:
Powder compaction at elevated temperature or known as warm compaction is a process of producing green compacts from metal powder, which is generally conducted between the ambient and the recrystalization temperature of the main powder... more
Powder compaction at elevated temperature or known as warm compaction is a process of producing green compacts from metal powder, which is generally conducted between the ambient and the recrystalization temperature of the main powder constituent. Even though, warm compaction was initiated at around 1998, not a lot of information can be found in the literature especially on the numerical simulation of the process. Therefore, this paper presents the simulation of warm metal powder forming process by using the developed computer code. The Elliptical Cap yield model has been used to represent the deformation behaviour of the powder mass during the forming process at above ambient temperature. The material properties of powder mass, i. e., friction coefficient, elastic index, and plastic index, at different forming temperature, are established through warm compaction experiment. The simulation was conducted to generate a green compact of a plain bush component. Some numerical simulation results were validated through experimentation, where a good agreement was found between the numerical simulation and the experimental results.
http://www.scientific.net/kem.462-463.704
http://www.scientific.net/kem.462-463.704
Research Interests: Critical Theory, Artificial Intelligence, Political Economy, Globalization, Powder Metallurgy, and 32 moreDesign of Experiments, Numerical Analysis, Intellectual Property Law, Cultural Economy, Fracture Mechanics, Computational Mathematics, Authorship, Material Culture, Simulation, Copyright Law, High Temperature Fiber-Forming Polymers, Experimentation, Dynamic Systems and Control, Deformation Behaviour of RCC Members under creep, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, Elevated Temperature Material Properties, Green Compacts, Warm Compaction, Ambient Temperatures, Computer Codes, Forming Process, Friction Coefficients, Powder Compactions, Yield Models, Integration Technology of Automation Systems, Overvoltages Computation, Insulation Coordination Studeis, Compaction and Uprating of Transmission System, Earthing Design of Transmisison and Distribution System, and The History of Print(Design of Experiments, Numerical Analysis, Intellectual Property Law, Cultural Economy, Fracture Mechanics, Computational Mathematics, Authorship, Material Culture, Simulation, Copyright Law, High Temperature Fiber-Forming Polymers, Experimentation, Dynamic Systems and Control, Deformation Behaviour of RCC Members under creep, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, Elevated Temperature Material Properties, Green Compacts, Warm Compaction, Ambient Temperatures, Computer Codes, Forming Process, Friction Coefficients, Powder Compactions, Yield Models, Integration Technology of Automation Systems, Overvoltages Computation, Insulation Coordination Studeis, Compaction and Uprating of Transmission System, Earthing Design of Transmisison and Distribution System, and The History of Print)
(Design of Experiments, Numerical Analysis, Intellectual Property Law, Cultural Economy, Fracture Mechanics, Computational Mathematics, Authorship, Material Culture, Simulation, Copyright Law, High Temperature Fiber-Forming Polymers, Experimentation, Dynamic Systems and Control, Deformation Behaviour of RCC Members under creep, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, Elevated Temperature Material Properties, Green Compacts, Warm Compaction, Ambient Temperatures, Computer Codes, Forming Process, Friction Coefficients, Powder Compactions, Yield Models, Integration Technology of Automation Systems, Overvoltages Computation, Insulation Coordination Studeis, Compaction and Uprating of Transmission System, Earthing Design of Transmisison and Distribution System, and The History of Print)
Hydroxyapatite (HA) which compose around 70 % of our bone is an example of bioactive ceramics most commonly used in bone implantation. Because of their excellent bioactivities, hydroxyapatites are regarded as attractive biomedical... more
Hydroxyapatite (HA) which compose around 70 % of our bone is an example of bioactive ceramics most commonly used in bone implantation. Because of their excellent bioactivities, hydroxyapatites are regarded as attractive biomedical materials. In this work we have succeeded in producing hydroxyapatite powder by using eggshell waste as the raw material. Eggshell waste is available in huge quantity from food processing, egg breaking and hatching industries. The process involved drying and thermal decomposition of eggshell into calcium oxide followed by hydrothermal reaction at low temperature with diammonium hydrogen phosphate and water. The produced hydroxyapatite powder is extraordinarily fine with nanosize primary particles. Its high purity proved that the product fulfills medical requirement. The present invention provides an environmentally beneficial and cost effective method of producing medical grade hydroxyapatite materials utilizing eggshell waste.
http://link.springer.com/chapter/10.1007/978-3-540-69139-6_85
http://link.springer.com/chapter/10.1007/978-3-540-69139-6_85
Research Interests: Protein, Polymers, Shape memory materials for biomedical applications, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Drugs, and 22 moreCnt, Growth Factors, Marketing and Promotional Strateggies most commonly used by Travel Agencies, Low Temperatures, Primary Biological Aerosol Particles, TIO2 NANOPARTICALS BY SOL-GEL METHODE OR HYDROTHERMAL, Calcium Oxide, High Purity, Hydroxyapatite Powder, Cost-effective Methods, Eggshell Waste, Bioactive Ceramic, Bone Implantation, Chemical Conversions, Di-ammonium Hydrogen Phosphate, Hydrothermal Methods, Hydrothermal Reaction, Medical Grades, Nano-size, Thermal Decompositions, Modification of Titania Nanotubes Using Bioactive Materials(BMP, and Graphene Ect.)(Cnt, Growth Factors, Marketing and Promotional Strateggies most commonly used by Travel Agencies, Low Temperatures, Primary Biological Aerosol Particles, TIO2 NANOPARTICALS BY SOL-GEL METHODE OR HYDROTHERMAL, Calcium Oxide, High Purity, Hydroxyapatite Powder, Cost-effective Methods, Eggshell Waste, Bioactive Ceramic, Bone Implantation, Chemical Conversions, Di-ammonium Hydrogen Phosphate, Hydrothermal Methods, Hydrothermal Reaction, Medical Grades, Nano-size, Thermal Decompositions, Modification of Titania Nanotubes Using Bioactive Materials(BMP, and Graphene Ect.))
(Cnt, Growth Factors, Marketing and Promotional Strateggies most commonly used by Travel Agencies, Low Temperatures, Primary Biological Aerosol Particles, TIO2 NANOPARTICALS BY SOL-GEL METHODE OR HYDROTHERMAL, Calcium Oxide, High Purity, Hydroxyapatite Powder, Cost-effective Methods, Eggshell Waste, Bioactive Ceramic, Bone Implantation, Chemical Conversions, Di-ammonium Hydrogen Phosphate, Hydrothermal Methods, Hydrothermal Reaction, Medical Grades, Nano-size, Thermal Decompositions, Modification of Titania Nanotubes Using Bioactive Materials(BMP, and Graphene Ect.))
The notch root elasto-plastic strains of circumferentially grooved round specimen of cast magnesium WE43-T6 were experimentally measured using the electronic speckle pattern interferometry (ESPI) and numerically evaluated using the finite... more
The notch root elasto-plastic strains of circumferentially grooved round specimen of cast magnesium WE43-T6 were experimentally measured using the electronic speckle pattern interferometry (ESPI) and numerically evaluated using the finite element analysis (FEA). The specimens have notch radii of 1.6 mm and 0.8 mm and an opening angle of 60°. The technique of ESPI showed its accuracy in measuring three-dimensional surface deformations on large negatively curved manifolds. The measured nominal stress for rupture is well beyond the ultimate strength, suggesting the existence of significant biaxial stress at the notch root region. The ESPI-based strains on the notch tips were shown to be in agreement with those evaluated by the FEA. The FEA also showed that the maximum elastic strain is shifted away from the notch root surface as the plastic strain is predominant.
http://www.sciencedirect.com/science/article/pii/S0261306913003348
http://www.sciencedirect.com/science/article/pii/S0261306913003348
Research Interests: Hydroxyapatite, Alumina, Forsterite, Zirconia, Ceramics (Engineering Ceramics, Microstructural Investigation), and 6 moreCutting Tool Technology (Ceramics Cutting Tool, Ceramics Machining), Failure Analysis (Materials Charaterization, Microstructural Investigation), Bio Meterial (Hydroxyapatite, Ceramics Composites, Ceramics (Zirconia, and Steatite)
Siliceous mesoporous materials with pores of ordered 2-D hexagonal structure were successfully prepared without hydrothermal treatment from condensation-polymerization of various concentration of quaternary ammonium salt as structure... more
Siliceous mesoporous materials with pores of ordered 2-D hexagonal structure were successfully prepared without hydrothermal treatment from condensation-polymerization of various concentration of quaternary ammonium salt as structure directing agents and silica precursor from the supernatant of coal fly ash (CFA) in the presence of catalyst. The synthesized materials had high surface area of ca. 740 m2 g-1 and pore volume of ca. 0.42 mL g-1. The synthesized material exhibited a narrow size pore distribution and the mean pore diameter as measured by Dollimore-Heal method was about 2.3 nm. The formation of ammonium salt that act as precipitant during the synthesis enable the hydrolysis and co-condensation of the sodium silicate at room temperature.
http://ac.els-cdn.com/S0254058406001957/1-s2.0-S0254058406001957-main.pdf?_tid=94fbfb08-e777-11e2-8c2f-00000aacb361&acdnat=1373251336_eadd3997df60cb3e1b7112b8859a6a6b
http://ac.els-cdn.com/S0254058406001957/1-s2.0-S0254058406001957-main.pdf?_tid=94fbfb08-e777-11e2-8c2f-00000aacb361&acdnat=1373251336_eadd3997df60cb3e1b7112b8859a6a6b
Research Interests: Renewable Energy, Catalysts, Coal, Bose Einstein Condensation, Enzymatic hydrolysis, and 15 moreMesoporous Silica Modification, 1453, Fly Ash, Mesoporous Materials, Coal Fly Ash, Room Temperature Synthesis, Sodium Silicate Process, K. F.; Sapkal S. B.; Kakade, Biomass to Bioethanol, Fermentation Microorganisms, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009(Mesoporous Silica Modification, 1453, Fly Ash, Mesoporous Materials, Coal Fly Ash, Room Temperature Synthesis, Sodium Silicate Process, K. F.; Sapkal S. B.; Kakade, Biomass to Bioethanol, Fermentation Microorganisms, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009)
(Mesoporous Silica Modification, 1453, Fly Ash, Mesoporous Materials, Coal Fly Ash, Room Temperature Synthesis, Sodium Silicate Process, K. F.; Sapkal S. B.; Kakade, Biomass to Bioethanol, Fermentation Microorganisms, 11. Boric Acid As An Efficient Catalyst for the Synthesis of 1, 1 diacetate Under Solvent free Condition Shelke, G. K.; Shinde, P. V.; Shingate B. B.; Shingare, and M. S. Chinese Chemical Letters 2009)
Nanocrystalline lead zirconate titanate (PZT) powders have been synthesized using microemulsion processing route. Microemulsion is one of the major processing techniques to synthesize a nanosize, homogenous, and almost agglomerate free... more
Nanocrystalline lead zirconate titanate (PZT) powders have been synthesized using microemulsion processing route. Microemulsion is one of the major processing techniques to synthesize a nanosize, homogenous, and almost agglomerate free ceramic powders. The ternary microemulsion system is consisted of cyclohexane as the oil phase, Triton X100 as the nonionic surfactant phase, and an aqueous phase containing 0.619MPb 2+, 0.325MZr 4+, and 0.3MTi 4+, representing a Pb 2+: Zr 4+: Ti 4+ molar ratio of 1:0.52:0.48. The ratio of these cations has been adjusted using Inductively Coupled Plasma (ICP) technique. After coprecipitation of metallic hydroxides by adding ammonia solution in microemulsion system, the PZT precursor was obtained. PZT powders have been prepared upon calcination of precursor at 800°C. Prepared powders was characterised using techniques such as X-ray diffraction, differential thermal analysis, and scanning electron microscopy. The characteristics of microemulsion processed powder is discussed, with emphasis on the presence of nano scaled PZT powder with a composition near to morphotropic phase boundary (MPB) without formation of any intermediate phases.
http://proceedings.aip.org/resource/2/apcpcs/1315/1/265_1?isAuthorized=no
http://proceedings.aip.org/resource/2/apcpcs/1315/1/265_1?isAuthorized=no
Research Interests:
In recent years there has been considerable growth in the use of optical methods for evaluating surfaces. Conventional stylus techniques, though powerful, have their own limitations. These include the resolution of the stylus, and the... more
In recent years there has been considerable growth in the use of optical methods for evaluating surfaces. Conventional stylus techniques, though powerful, have their own limitations. These include the resolution of the stylus, and the damage caused by the moving diamond stylus when tracing profiles on soft materials. Hence non-contact methods of measuring surface finish of often required. One approach in this direction is the use of an optical diffraction technique. The unique properties of the diffraction phenomenon make this technique useful and the validity of this technique in the evaluation of surface finish is investigated in this paper.
http://ac.els-cdn.com/0043164895068147/1-s2.0-0043164895068147-main.pdf?_tid=8ddcddce-e777-11e2-aba1-00000aacb35f&acdnat=1373251324_f2cb5cbd66ac93ab11576001f8be9fe2
http://ac.els-cdn.com/0043164895068147/1-s2.0-0043164895068147-main.pdf?_tid=8ddcddce-e777-11e2-aba1-00000aacb35f&acdnat=1373251324_f2cb5cbd66ac93ab11576001f8be9fe2
Research Interests: Computed Tomography, Optical Switching Techniques, Acoustic Measurement Techniques, Surface Roughness, Cutting Parameters and Surface Roughness, and 10 moreMaterials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Dimensional Metrology, Roughness measurements and analysis, Optical Filters, Graphical Filtering, Stylus Measurement, Electromagnetic Wave Diffraction, Optical Diffraction Technique, X ray Inspection, and Surface Finish Characterisation(Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Dimensional Metrology, Roughness measurements and analysis, Optical Filters, Graphical Filtering, Stylus Measurement, Electromagnetic Wave Diffraction, Optical Diffraction Technique, X ray Inspection, and Surface Finish Characterisation)
(Materials Characterization, X-ray diffraction and Rietveld Method applied areas of physics, chemistry, geology, medical and engineering and materials science., Dimensional Metrology, Roughness measurements and analysis, Optical Filters, Graphical Filtering, Stylus Measurement, Electromagnetic Wave Diffraction, Optical Diffraction Technique, X ray Inspection, and Surface Finish Characterisation)
Titanium alloys are extensively used in aerospace, biomedical applications and they are used in corrosive environments. In this study, the effect of cutting parameters on the surface roughness in turning of titanium alloy has been... more
Titanium alloys are extensively used in aerospace, biomedical applications and they are used in corrosive environments. In this study, the effect of cutting parameters on the surface roughness in turning of titanium alloy has been investigated using response surface methodology. The experimental studies were conducted under varying cutting speeds, feed and depths of cut. The chip formation and SEM analysis are discussed to enhance the supportive surface quality achieved in turning. The work material used for the present investigation is commercial aerospace titanium alloy (gr5) and the tool used is RCMT 10T300 - MT TT3500 round insert. The equation developed using response surface methodology is used for predicting the surface roughness in machining of titanium alloy. The results revealed that the feed was the most influential factor which affect the surface roughness.
http://ac.els-cdn.com/S0263224112000255/1-s2.0-S0263224112000255-main.pdf?_tid=8ad9be44-e777-11e2-90e1-00000aacb35d&acdnat=1373251320_e9ff2e88dc9e33a4c4e66e6bdf8e387c
http://ac.els-cdn.com/S0263224112000255/1-s2.0-S0263224112000255-main.pdf?_tid=8ad9be44-e777-11e2-90e1-00000aacb35d&acdnat=1373251320_e9ff2e88dc9e33a4c4e66e6bdf8e387c
Research Interests: Artificial Intelligence, Academic Integrity, Numerical Analysis, Computational Mathematics, High speed machining of titanium, and 19 moreSurface Roughness, Simulation, Tool, Taguchi Methods, Composite, Coatings, Methodologies, Wear mechanisms, Orthogonal Array, Dynamic Systems and Control, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, Chip Formation, Aerospace Titanium Alloy (Gr5), Response Surface Modeling, Round Coated Carbide Insert, Chemical-vapor-deposition, and Integration Technology of Automation Systems(Surface Roughness, Simulation, Tool, Taguchi Methods, Composite, Coatings, Methodologies, Wear mechanisms, Orthogonal Array, Dynamic Systems and Control, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, Chip Formation, Aerospace Titanium Alloy (Gr5), Response Surface Modeling, Round Coated Carbide Insert, Chemical-vapor-deposition, and Integration Technology of Automation Systems)
(Surface Roughness, Simulation, Tool, Taguchi Methods, Composite, Coatings, Methodologies, Wear mechanisms, Orthogonal Array, Dynamic Systems and Control, Information Technology and System Integration, Optimization Technology, System Modeling and Simulation, Chip Formation, Aerospace Titanium Alloy (Gr5), Response Surface Modeling, Round Coated Carbide Insert, Chemical-vapor-deposition, and Integration Technology of Automation Systems)
Problem statement: Metal Matrix Composites (MMC) have become a leading material among composite materials and in particular, particle reinforced aluminum MMCs have received considerable attention due to their excellent engineering... more
Problem statement: Metal Matrix Composites (MMC) have become a leading material among composite materials and in particular, particle reinforced aluminum MMCs have received considerable attention due to their excellent engineering properties. These materials are known as the difficult-to-machine materials because of the hardness and abrasive nature of reinforcement elementlike Alumina (Al 2O 3). Approach: In this study, an attempt has been made to model the machinability evaluation through the response surface methodology in machining of homogenized 10% micron Al 2O 3 LM25 Al MMC manufactured through stir casting method. Results: The combined effects of three machining parameters including cutting speed (s), feed rate (f) and depth of cut (d) on the basis of three performance characteristics of tool wear (VB), surface Roughness (Ra) and cutting Force (Fz) were investigated. The contour plots were generated to study the effect of process parameters as well as their interactions. Conclusion: The process parameters are optimized using desirability-based approach response surface methodology.
http://www.scopus.com/inward/record.url?eid=2-s2.0-84856766421&partnerID=40&md5=459b80c0097890d4923fdbbc596182e8
http://www.scopus.com/inward/record.url?eid=2-s2.0-84856766421&partnerID=40&md5=459b80c0097890d4923fdbbc596182e8
Research Interests:
Intelligent Air-Cushion Tracked Vehicle (IACTV) is intended as an alternative to conventional off-road vehicles, which are driven by track system and air-cushion system. To make IACTV as efficient as possible, proper investigation of... more
Intelligent Air-Cushion Tracked Vehicle (IACTV) is intended as an alternative to conventional off-road vehicles, which are driven by track system and air-cushion system. To make IACTV as efficient as possible, proper investigation of vehicle performance is essential. However, most relevant factors that affect the competitive efficiency of the air-cushion tracked vehicle are the tractive effort, motion resistance and power consumption. Therefore, an Artificial Neural-Network (ANN) model is proposed to investigate the vehicle performance. Cushion Clearance Height (CH), and Air-Cushion Pressure (CP) are used at the input layers while Power Consumption (PC), Tractive Effort (TE) and Motion Resistance (MR) arc used at the output layers. Experiments are carried out in the field to investigate the vehicle performance and compared with the results obtained from ANN.
http://irep.iium.edu.my/id/eprint/16834
http://irep.iium.edu.my/id/eprint/16834
Research Interests: Chemistry, Design, MRI, Consumer Culture Theory, Artificial Neural Networks, and 13 moreTe, Pedagogical Content Knowledge (PCK), System, Meta-Heuristics (Tabu Search, Genetic Algorithms, Simulated Annealing, Ant-Colony, Particle Swarm Optimization), Laser Scanning, Digital Terrain and Surface Modeling, Digital Photogrammetry, Aspect Oriented Programming Language Approach Using Fuzzy Logic, Tractive Effort Curves, Politics of Consumption, Cushion Clearance Height, Motion Resistance, Power Relations In the Market Place, Gender Identity and Consumption Practices, and Socio cultural and Ideological Patterning of Consumption(Te, Pedagogical Content Knowledge (PCK), System, Meta-Heuristics (Tabu Search, Genetic Algorithms, Simulated Annealing, Ant-Colony, Particle Swarm Optimization), Laser Scanning, Digital Terrain and Surface Modeling, Digital Photogrammetry, Aspect Oriented Programming Language Approach Using Fuzzy Logic, Tractive Effort Curves, Politics of Consumption, Cushion Clearance Height, Motion Resistance, Power Relations In the Market Place, Gender Identity and Consumption Practices, and Socio cultural and Ideological Patterning of Consumption)
(Te, Pedagogical Content Knowledge (PCK), System, Meta-Heuristics (Tabu Search, Genetic Algorithms, Simulated Annealing, Ant-Colony, Particle Swarm Optimization), Laser Scanning, Digital Terrain and Surface Modeling, Digital Photogrammetry, Aspect Oriented Programming Language Approach Using Fuzzy Logic, Tractive Effort Curves, Politics of Consumption, Cushion Clearance Height, Motion Resistance, Power Relations In the Market Place, Gender Identity and Consumption Practices, and Socio cultural and Ideological Patterning of Consumption)
The sintering behavior of yttria-stabilized zirconia, with the influence of small additions of MnO2 (up to 1 wt %) sintered over the temperature range from 1250°C to 1500°C was investigated. It was found that the mechanical properties of... more
The sintering behavior of yttria-stabilized zirconia, with the influence of small additions of MnO2 (up to 1 wt %) sintered over the temperature range from 1250°C to 1500°C was investigated. It was found that the mechanical properties of Y-TZP were dependent on the dopant amount and sintering temperature. The results revealed that relative densities above 97.5% of theoretical (i.e. >5.95Mgm-3) could be obtained in Y-TZPs sintered at low temperatures, 1250°C and 1300°C, with the additions of ≤0.3wt%MnO2. In comparison to the undoped samples, the additions of up to 1 wt% MnO2 and for sintering up to 1350°C was found to be beneficial in enhancing the Vickers hardness of the ceramic. The fracture toughness of Y-TZP however, was found to increase only in the 1wt%MnO 2-doped samples when sintered above 1400°C. The relation between the measured mechanical properties is discussed with the emphasis on the role of the manganese oxide.
http://proceedings.aip.org/resource/2/apcpcs/1315/1/283_1?isAuthorized=no
http://proceedings.aip.org/resource/2/apcpcs/1315/1/283_1?isAuthorized=no
Research Interests:
The influence of small additions of MnO2 (up to 1 wt. %) on the sintering behaviour of yttria-stabilized zirconia sintered over the temperature range from 1250°C to 1500°C was investigated. It was found that the mechanical properties of... more
The influence of small additions of MnO2 (up to 1 wt. %) on the sintering behaviour of yttria-stabilized zirconia sintered over the temperature range from 1250°C to 1500°C was investigated. It was found that the mechanical properties of Y-TZP were dependent on the dopant amount and sintering temperature. The results revealed that relative densities above 97.5 % of theoretical (i.e. < 5.95 Mg m-3) could be obtained in Y-TZPs sintered at low temperatures, 1250°C and 1300°C, with the additions of ≥ 0.3 wt. % MnO2. In comparison to the undoped samples, the additions of up to 1 wt. % MnO2 and for sintering up to 1350°C was found to be beneficial in enhancing the Vickers hardness of the ceramic. The fracture toughness of Y-TZP however, was found to increase only in the 1 wt. % MnO 2-doped samples when sintered above 1400°C. The relation between the measured mechanical properties is discussed with the emphasis on the role of the manganese oxide.
http://www.scopus.com/inward/record.url?eid=2-s2.0-84878945053&partnerID=40&md5=950226902fa7fee5de87eac337871622
http://www.scopus.com/inward/record.url?eid=2-s2.0-84878945053&partnerID=40&md5=950226902fa7fee5de87eac337871622
Research Interests:
The effect of Manganese (Mn) addition on the Vickers hardness and relative density of nanocrystalline hydroxyapatite (HA) dense bodies were studied. The starting Mn doped HA powders was synthesized via sol-gel method with Mn concentration... more
The effect of Manganese (Mn) addition on the Vickers hardness and relative density of nanocrystalline hydroxyapatite (HA) dense bodies were studied. The starting Mn doped HA powders was synthesized via sol-gel method with Mn concentration varies from 2 mol% up to 15 mol% Mn. The Mn doped HA disc samples were prepared by uniaxial pressing at 200MPa and subsequently sintered at 1300 degrees C. Characterization was carried out where appropriate to determine the phases present, bulk density, Vickers hardness of the various content of Mn doped HA dense bodies. The addition of Mn was observed to influence the color appearance of the powders and dense bodies as well. Higher Mn concentration resulted in dark grey powders. It was also found that the hardness and relative density of the material increased as the Mn content increased and influenced by the crystallinity of the prepared Mn doped HA powders.
http://irep.iium.edu.my/6292/1/Influence_of_Mg_Doping_-MJM_2008.pdf
http://irep.iium.edu.my/6292/1/Influence_of_Mg_Doping_-MJM_2008.pdf
Research Interests: Biochemistry, Mathematical Physics, Chemistry, Medicinal Chemistry, Biomaterials, and 20 moreString Theory, Nanoparticles, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Human, Organic Synthesis, Article, Higgs physics, Particle, Powder, Bone Prosthesis, Bone Substitutes, Manganese Derivative, Coated Materials, Biocompatible, Drying Process and Technology, Spray Drying, Fluidised bed Dryer, Solid Phase Crystallization, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition(String Theory, Nanoparticles, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Human, Organic Synthesis, Article, Higgs physics, Particle, Powder, Bone Prosthesis, Bone Substitutes, Manganese Derivative, Coated Materials, Biocompatible, Drying Process and Technology, Spray Drying, Fluidised bed Dryer, Solid Phase Crystallization, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition)
(String Theory, Nanoparticles, Bioinorganic Chemistry, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Human, Organic Synthesis, Article, Higgs physics, Particle, Powder, Bone Prosthesis, Bone Substitutes, Manganese Derivative, Coated Materials, Biocompatible, Drying Process and Technology, Spray Drying, Fluidised bed Dryer, Solid Phase Crystallization, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition)
The sinterability of magnesium oxide (MgO) doped hydroxyapatite (HA) ranging from 0.05 to 1 wt% was investigated. Green samples were prepared and sintered in air at temperatures ranging from 1000°C to 1400°C. Sintered bodies were... more
The sinterability of magnesium oxide (MgO) doped hydroxyapatite (HA) ranging from 0.05 to 1 wt% was investigated. Green samples were prepared and sintered in air at temperatures ranging from 1000°C to 1400°C. Sintered bodies were characterized to determine the phase stability, bulk density, hardness, fracture toughness and Young's modulus. XRD analysis revealed that the HA phase stability was not disrupted throughout the sintering regime employed. In general, samples containing 1 wt% MgO and when sintered at lower temperatures possessed better mechanical properties than the undoped HA. The study revealed that all HA samples achieved > 98% relative density when sintered between 1050°C-1300°C. The addition of 1 wt% MgO when sintered at 1150°C was found to be most beneficial throughout the studied range as the samples exhibited the highest Young's modulus of 136.3 GPa, Vickers's hardness of 7.66 GPa and fracture toughness of 1.48 MPam 1/2 as compared to 113.57 GPa, 7.10 GPa and 1.08 MPam 1/2 for the undoped HA.
http://link.springer.com/chapter/10.1007%2F978-3-540-69139-6_83?LI=true
http://link.springer.com/chapter/10.1007%2F978-3-540-69139-6_83?LI=true
Research Interests: Mechanical Properties of Ceramics, Hydroxyapatite, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Alumina, Vickers Hardness, and 18 moreXRD, Young's Modulus of Ceramic, Forsterite, Apatite, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, PIXE, Magnesium oxide wallboard, Green Samples, Sintered Body, Sinterability, Magnesium Doping, Magnesium Oxides, Analysis of Environmental Samples Using Nuclear Techniques Such As XRF, AAS Among Others, Ceramics Composites, Ceramics (Zirconia, and Steatite)(XRD, Young's Modulus of Ceramic, Forsterite, Apatite, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, PIXE, Magnesium oxide wallboard, Green Samples, Sintered Body, Sinterability, Magnesium Doping, Magnesium Oxides, Analysis of Environmental Samples Using Nuclear Techniques Such As XRF, AAS Among Others, Ceramics Composites, Ceramics (Zirconia, and Steatite))
(XRD, Young's Modulus of Ceramic, Forsterite, Apatite, Temporal variation of soil bulk density and degree of compactness of an Oxisol under no-tillage chiseled, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, PIXE, Magnesium oxide wallboard, Green Samples, Sintered Body, Sinterability, Magnesium Doping, Magnesium Oxides, Analysis of Environmental Samples Using Nuclear Techniques Such As XRF, AAS Among Others, Ceramics Composites, Ceramics (Zirconia, and Steatite))
In the present research, nano hydroxyapatite (HA) powder doped with magnesia (MgO) was studied. The dopant was added to pure HA powder and ball milling was done for 1 hour. Green samples, in the form of discs and rectangular bars, were... more
In the present research, nano hydroxyapatite (HA) powder doped with magnesia (MgO) was studied. The dopant was added to pure HA powder and ball milling was done for 1 hour. Green samples, in the form of discs and rectangular bars, were prepared and consolidated in air at temperatures ranging from 1000°C to 1300°C. The sintered samples were characterized to determine the phase stability, relative density, hardness, fracture toughness and Young's modulus. The phase analysis revealed that the HA phase was not disrupted regardless of dopant additions and sintering temperature. It has been revealed that all HA samples achieved > 98% relative density when sintered between 1100°C-1300°C. However, the addition of 0.5 wt% MgO when sintered at 1100°C was found to be most beneficial in aiding sintering with samples exhibiting the highest Young's modulus of 122.15 GPa and fracture toughness of 1.64 MPam 1/2 as compared to 116.57 GPa and 1.18 MPam 1/2 for the undoped HA.
http://link.springer.com/chapter/10.1007/978-3-642-21729-6_23
http://link.springer.com/chapter/10.1007/978-3-642-21729-6_23
Research Interests: Mechanical Properties of Ceramics, Shamanism, Entheogens, Tiwanaku, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, and 18 moreMechanical properties, Bioceramics, Hallucinogens, Electrophoretic Deposition, Synthesis of Nano Crystalline Hydroxyapatite in Injectable Forms, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, mGovernment, 3 PHASE FIVE LEVEL MULTILEVEL INVERTER ANALYSIS WITH DIFFERENT STRATEGIES USING MATLAB SIMULINK, Green Samples, Sinterability, Magnesium Doping, Rectangular Bar, Snuff Powders, Anadenanthera, Hydroxyapatite Based Coatings, Corrosion Behaviour, Solgelcoating etc, and Dopant Additions(Mechanical properties, Bioceramics, Hallucinogens, Electrophoretic Deposition, Synthesis of Nano Crystalline Hydroxyapatite in Injectable Forms, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, mGovernment, 3 PHASE FIVE LEVEL MULTILEVEL INVERTER ANALYSIS WITH DIFFERENT STRATEGIES USING MATLAB SIMULINK, Green Samples, Sinterability, Magnesium Doping, Rectangular Bar, Snuff Powders, Anadenanthera, Hydroxyapatite Based Coatings, Corrosion Behaviour, Solgelcoating etc, and Dopant Additions)
(Mechanical properties, Bioceramics, Hallucinogens, Electrophoretic Deposition, Synthesis of Nano Crystalline Hydroxyapatite in Injectable Forms, A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85 .Calculate the periodic time of small oscillations when the cylinder floats with its axis vertical in sill water, mGovernment, 3 PHASE FIVE LEVEL MULTILEVEL INVERTER ANALYSIS WITH DIFFERENT STRATEGIES USING MATLAB SIMULINK, Green Samples, Sinterability, Magnesium Doping, Rectangular Bar, Snuff Powders, Anadenanthera, Hydroxyapatite Based Coatings, Corrosion Behaviour, Solgelcoating etc, and Dopant Additions)
The paper reports on the effect of Ca/P ratio (1.57, 1.67 and 1.87) on the densification behaviour of nanocrystalline hydroxyapatite (HA) prepared by a chemical precipitation method. Green compacts were prepared and sintered at... more
The paper reports on the effect of Ca/P ratio (1.57, 1.67 and 1.87) on the densification behaviour of nanocrystalline hydroxyapatite (HA) prepared by a chemical precipitation method. Green compacts were prepared and sintered at temperatures ranging from 1000°C to 1350°C. The sintered samples were characterized to determine the HA phase stability, bulk density, hardness, fracture toughness and Young's modulus. XRD analysis revealed that the phase stability was not disrupted throughout the sintering regime employed for HA having Ca/P ratio of 1.57 and 1.67. However, secondary phases were observed for HA having a Ca/P ratio of 1.87 when sintered at high temperatures. In general, regardless of Ca/P ratio, the HA bodies achieved > 95% relative density when sintered at 1100°C-1250°C. The results indicated that the stoichiometric HA (Ca/P ratio = 1.67) exhibited the overall best properties, with the highest hardness of 7.23 GPa and fracture toughness of 1.28 MPam1/2 being attained when sintered at 1000°C-1050°C.
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1333648
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1333648
Research Interests: Sintering, Hydroxyapatite, Electronic properties of materials, Nanotechnology, Natural Fibre Composites, and 27 moreBiological Materials, Fracture Mechanics, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Mechanical properties, Polymer Composites, Bioceramics, Hardness, Apatite, Electrophoretic Deposition, Nano Thermal Barrier Coatings and its Corrosion at high temperatures, Chemical Precipitation, Chemical sensors, Physical Sensors, Fracture Toughness, Sinterability, Hydroxylation, Bulk Densities, Ca/p Ratios, Chemical Precipitation Method, Densification Behaviour, Green Compacts, Hydroxyapatite Based Coatings, Corrosion Behaviour, Solgelcoating etc, Conducting Polymer Based Temperature Sensor, Charge Transport Properties of Nanostructures, and Bulk Films(Biological Materials, Fracture Mechanics, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Mechanical properties, Polymer Composites, Bioceramics, Hardness, Apatite, Electrophoretic Deposition, Nano Thermal Barrier Coatings and its Corrosion at high temperatures, Chemical Precipitation, Chemical sensors, Physical Sensors, Fracture Toughness, Sinterability, Hydroxylation, Bulk Densities, Ca/p Ratios, Chemical Precipitation Method, Densification Behaviour, Green Compacts, Hydroxyapatite Based Coatings, Corrosion Behaviour, Solgelcoating etc, Conducting Polymer Based Temperature Sensor, Charge Transport Properties of Nanostructures, and Bulk Films)
(Biological Materials, Fracture Mechanics, Tissue Engineering: Hard Tissue Engineering (Bone Substitutes and Implants),Bioceramics such as Calcium Phosphate Especially Hydroxyapatite and Beta Tricalcium Phosphate, Porous Bioceramics for Bone Implants, Mechanical properties, Polymer Composites, Bioceramics, Hardness, Apatite, Electrophoretic Deposition, Nano Thermal Barrier Coatings and its Corrosion at high temperatures, Chemical Precipitation, Chemical sensors, Physical Sensors, Fracture Toughness, Sinterability, Hydroxylation, Bulk Densities, Ca/p Ratios, Chemical Precipitation Method, Densification Behaviour, Green Compacts, Hydroxyapatite Based Coatings, Corrosion Behaviour, Solgelcoating etc, Conducting Polymer Based Temperature Sensor, Charge Transport Properties of Nanostructures, and Bulk Films)
The effects of CuO additions on the grain interior and grain boundary resistivity in coated 2.5 mol% Y-TZP ceramics have been studied by using impedance spectroscopy. In addition, the effects of hydrothermal ageing on the conductivities... more
The effects of CuO additions on the grain interior and grain boundary resistivity in coated 2.5 mol% Y-TZP ceramics have been studied by using impedance spectroscopy. In addition, the effects of hydrothermal ageing on the conductivities of the ceramics were evaluated. The results showed that the grain interior and grain boundary resistivities increased with increasing CuO content. In particular, the grain boundary resistivity was observed to increase significantly in the doped ceramics, which could have been due to the formation of compounds, and resulted in lower conductivity. Impedance spectroscopy performed on the hydrothermally aged Y-TZPs revealed that the grain boundary regions were significantly affected, i.e. the grain boundary resistivities of the undoped and CuO-doped samples were increased by 65% and 45% respectively after ageing for 200 h. Thus, the indication is that the ageing-induced tetragonal to monoclinic phase transformation is closely associated with changes in the grain boundary regions.
http://link.springer.com/content/pdf/10.1023%2FA%3A1004455130927.pdf
http://link.springer.com/content/pdf/10.1023%2FA%3A1004455130927.pdf
Research Interests: Mathematical Physics, Segregation, String Theory, Yttria-stabilized zirconia, Higgs physics, and 13 moreElectrical Conductivity, Impurities, Dc Ionic Conductivity, Tetragonal Zirconia Polycrystals, Grain-boundary Resistivity, Stabilized Zirconia, Zro2-y2o3, What Is the Effect of Nutrient Values on Ph Value, Total Desolved Solods, Disolved Oxygen, Biological Disolved Oxygen, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition(Electrical Conductivity, Impurities, Dc Ionic Conductivity, Tetragonal Zirconia Polycrystals, Grain-boundary Resistivity, Stabilized Zirconia, Zro2-y2o3, What Is the Effect of Nutrient Values on Ph Value, Total Desolved Solods, Disolved Oxygen, Biological Disolved Oxygen, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition)
(Electrical Conductivity, Impurities, Dc Ionic Conductivity, Tetragonal Zirconia Polycrystals, Grain-boundary Resistivity, Stabilized Zirconia, Zro2-y2o3, What Is the Effect of Nutrient Values on Ph Value, Total Desolved Solods, Disolved Oxygen, Biological Disolved Oxygen, Theoretical High Energy Physics : Supersymmetry, and Cosmological Phase Transition)