- Southampton, UK
Single event electrospraying (SEE) is a method for the on-demand deposition of picoliter volumes of liquid. To investigate the influence of the size of the meniscus on the volume deposited per SEE, glass capillaries were used with and... more
Single event electrospraying (SEE) is a method for the on-demand deposition of picoliter volumes of liquid. To investigate the influence of the size of the meniscus on the volume deposited per SEE, glass capillaries were used with and without an anti-wetting coating comprising a self-assembled 1H,1H,2H,2H-perfluorodecyltrichlorosilane-based monolayer to control the meniscus size. The deposited volume was determined experimentally and we developed a model that incorporates electrostatics and electrodynamics on the one hand, and hydrostatics, fluid dynamics, and surface tension effects on the other hand. The volumes deposited from both a capillary with unmodified nozzle front (large meniscus) and from a capillary with a modified nozzle front (small meniscus) can be predicted by the theoretical model.
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... Review ; Research and development ; Foodstuff ; Plastic bag packaging ; Packaging material ; Polymer ; Plasma application ; Surface treatment ; Surface properties ; Quality ; Adhesivity ; Transport properties ; Food security ;... more
... Review ; Research and development ; Foodstuff ; Plastic bag packaging ; Packaging material ; Polymer ; Plasma application ; Surface treatment ; Surface properties ; Quality ; Adhesivity ; Transport properties ; Food security ; Property processing relationship ; Processing time ; ...
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The corrosion resistance of electrostatic powder coatings depends upon obtaining a smooth, nonporous film deposited uniformly over the surface of the entire substrate. The film must be free of voids, pinholes, and other surface defects.... more
The corrosion resistance of electrostatic powder coatings depends upon obtaining a smooth, nonporous film deposited uniformly over the surface of the entire substrate. The film must be free of voids, pinholes, and other surface defects. Two common defects on powder coated film arise from: (1) Faraday Cage effect causing uneven film thickness of recessed surface and (2) back corona that
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ABSTRACT This study investigates pressure loss in pipe bends at a novel combination of conditions - large pipe curvature and high Re. Detailed measurements of pressure drop, including measurements on the inside and outside of the pipe... more
ABSTRACT This study investigates pressure loss in pipe bends at a novel combination of conditions - large pipe curvature and high Re. Detailed measurements of pressure drop, including measurements on the inside and outside of the pipe bend, are made over a range of high Reynolds numbers (> 3 x 105). Under these conditions, upstream effects are much more pronounced than in previous investigations, and correlations for pressure drop in pipe bends significantly underpredict the measured pressure loss. The effect of two downstream exit configurations is also studied. The downstream exit configuration does not influence the pressure drop behavior upstream of the pipe bend, but leads to significant variations throughout the pipe bend. In all cases, wall friction is the dominant factor contributing to pressure loss in the bend.
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Development of a transparent electrodynamic shield to protect panels from dust deposition is described. The shield contains a clear panel with embed- ded parallel electrodes connected to a single-phase AC supply for producing an... more
Development of a transparent electrodynamic shield to protect panels from dust deposition is described. The shield contains a clear panel with embed- ded parallel electrodes connected to a single-phase AC supply for producing an electromagnetic wave. The electromagnetic field produced by the electrodes on the surface of the panel repels dust particles that have already deposited on the panel surface,
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The dry powder inhaler (DPI) is widely used for treating lung diseases such as asthma, emphysema and cystic fibrosis. Electrostatic charge has been shown to influence the deposition of inhaled particles in the lung increasing the... more
The dry powder inhaler (DPI) is widely used for treating lung diseases such as asthma, emphysema and cystic fibrosis. Electrostatic charge has been shown to influence the deposition of inhaled particles in the lung increasing the deposition fraction for 4.5 μm particles from 0.28 for particles under no electric field to 0.58 for particles that are negatively charged. To study
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Electrohydrodynamic atomization (EHDA) is an attractive technique to make new types of composite particles for pharmaceutical use. The aim of this work is to prove that EHDA can be successfully used to attach nano/micro-particles of... more
Electrohydrodynamic atomization (EHDA) is an attractive technique to make new types of composite particles for pharmaceutical use. The aim of this work is to prove that EHDA can be successfully used to attach nano/micro-particles of protein to lactose, the commonly used excipient for pulmonary delivery, keeping all the biological properties of the protein after dissolution of the complex. Bovine serum albumin (BSA) was used as a model protein. The atomization of BSA was tested with two different solvents, dimethyl sulfoxide (DMSO) and ethanol. The process using DMSO resulted in the formation of a thin layer of protein while the tests using ethanol resulted in the formation of spherical particles with mean diameters around 700 nm. Ethanol as solvent was also used to produce a composite formed by BSA adsorbed at the surface of lactose by electrostatic forces. No denaturation or significant conformational changes of the protein were observed, although an increase in the exposition of the lactose to the jet of the solution decreases the reproducibility of the method. Due to the absence of denaturation in the model protein, this new approach can be tested for the production of new formulations for dry powders for drug delivery systems.
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Continued innovations in the polymer industry have made polymer surface modification methods a subject of intense research. The importance and necessity of surface modification of plastics are explained, and the advantages of physical... more
Continued innovations in the polymer industry have made polymer surface modification methods a subject of intense research. The importance and necessity of surface modification of plastics are explained, and the advantages of physical surface treatments over the less-sophisticated chemical methods are outlined. Currently available physical surface modification methods for food packaging polymers are reviewed from the food packaging perspective. These
Research Interests: Nutrition and Dietetics, Technology, Polymers, Material Science, Animal Production, and 16 moreSurface modification, Food Packaging, Modification, Corona Discharge, Surface treatment, Surface Properties, Food Sciences, Ion Beam, Properties of materials, Laser Treatment, Critical Reviews in Food Science and Nutrition (CRIT REV FOOD SCI), Flame, Gamma Ray, Electron Beam, Gamma Irradiation, and Corona Effect(Surface modification, Food Packaging, Modification, Corona Discharge, Surface treatment, Surface Properties, Food Sciences, Ion Beam, Properties of materials, Laser Treatment, Critical Reviews in Food Science and Nutrition (CRIT REV FOOD SCI), Flame, Gamma Ray, Electron Beam, Gamma Irradiation, and Corona Effect)
(Surface modification, Food Packaging, Modification, Corona Discharge, Surface treatment, Surface Properties, Food Sciences, Ion Beam, Properties of materials, Laser Treatment, Critical Reviews in Food Science and Nutrition (CRIT REV FOOD SCI), Flame, Gamma Ray, Electron Beam, Gamma Irradiation, and Corona Effect)
DOE Scientific and Technical Information. DOE Scientific and Technical Information. ...
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DOE Scientific and Technical Information. DOE Scientific and Technical Information. ...
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ABSTRACT
Mercury removal from flue gases resulting from coal fired power plants is a prime concern. The goal of the Ohio Coal Research Consortium is to promote the use of Ohio coal by addressing the issues related to the control of trace substance... more
Mercury removal from flue gases resulting from coal fired power plants is a prime concern. The goal of the Ohio Coal Research Consortium is to promote the use of Ohio coal by addressing the issues related to the control of trace substance emission, ...
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Industrial use of single-nozzle electrohydrodynamic atomization for producing aerosol particles of uniform size is limited by the small throughput of the method. To increase it, out-scaling by means of multiple nozzles is inevitable. We... more
Industrial use of single-nozzle electrohydrodynamic atomization for producing aerosol particles of uniform size is limited by the small throughput of the method. To increase it, out-scaling by means of multiple nozzles is inevitable. We designed and tested a multi-nozzle system with a circular symmetry that provides a uniform flow rate and the same electric field intensity to all nozzles. Stability of particle production from multi-nozzle electrospray systems strongly depends on the precision of the liquid feeding system that typically requires high-cost pumps. A constant-head feeding system is a cost-effective alternative that can deliver the same performance. In order to describe the relation between flow rate and particle size in the constant-head operating mode, we developed a semi-empirical model that predicts the flow rate through the system. This model can be used with the conventional scaling law for predicting the diameter of the produced droplets.
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Experiments were conducted in order to study and characterize electrohydrodynamic atomization in the simple-jet mode for inviscid liquids. The operational window of this mode regarding the electric potential and liquid flow rate is... more
Experiments were conducted in order to study and characterize electrohydrodynamic atomization in the simple-jet mode for inviscid liquids. The operational window of this mode regarding the electric potential and liquid flow rate is presented. From the data it could be concluded that this mode can be divided by the characteristics of its breakup mechanism and that these characteristics are a function of the liquid Weber number and the electric Bond number for a given setup. Additionally we were also able to calculate the average charge per droplet and define the average size of primary and satellite droplets. The dispersion of the spray was also studied regarding its relation to the liquid Weber number and to the electric Bond number. We conclude that simple-jet mode electrosprays are a good option for applications which require monodisperse micrometer droplets with high throughput.
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The electrostatic microencapsulation process and the various means of achieving such encapsulation for developing composite particles with two or more powders is briefly reviewed, with a particular focus on the dual-function... more
The electrostatic microencapsulation process and the various means of achieving such encapsulation for developing composite particles with two or more powders is briefly reviewed, with a particular focus on the dual-function sorbent/scintillation particles for use in radionuclide selective sensing. In preparing the composite particles, two different types of particles, an ion-exchange resin and scintillating microbeads, were used. The sorbent particles