- Broomfield, United States
L'invention concerne un procede permettant la conversion de composes contenant du metal en metal ou oxyde metallique. Ce procede consiste a chauffer rapidement a une temperature elevee le compose contenant le metal afin de stimuler la... more
L'invention concerne un procede permettant la conversion de composes contenant du metal en metal ou oxyde metallique. Ce procede consiste a chauffer rapidement a une temperature elevee le compose contenant le metal afin de stimuler la conversion, et a le maintenir a une temperature elevee pendant un laps de temps suffisant afin d'obtenir une formation de metal ou d'oxyde metallique. Ce procede de fabrication de metaux et d'oxydes metalliques est efficace et economique.
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Micron-sized High Density Polyethylene (HDPE) particles were coated with ultrathin alumina (Al2O3) films in a Fluidized Bed Reactor (FBR) by Atomic Layer Deposition (ALD) at 77 oC. Fluidization of HDPE particles were achieved at reduced... more
Micron-sized High Density Polyethylene (HDPE) particles were coated with ultrathin alumina (Al2O3) films in a Fluidized Bed Reactor (FBR) by Atomic Layer Deposition (ALD) at 77 oC. Fluidization of HDPE particles were achieved at reduced pressure with the assistance of stirring or vibration. Al2O3 films on the HDPE particles were confirmed by different methods. These particles were extruded conventionally with the ceramic shells mixing intimately in the polymer matrix. The successful dispersion of the crushed Al2O3 shells in the polymer matrix following extrusion was confirmed.
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There exist materials problems in almost every established industry. These problems include thermal management, diffusional resistance characteristics, chemical reaction characteristics, surface property mismatches, structural integrity,... more
There exist materials problems in almost every established industry. These problems include thermal management, diffusional resistance characteristics, chemical reaction characteristics, surface property mismatches, structural integrity, and electrical properties, among others. As materials are being discovered to try to solve some of these problems, it turns out that a combination of existing materials is often the ideal solution. In many cases, a fine particle that is conformally encapsulated in an ultrathin layer of a second material is exactly what is needed to solve the problem. The particle maintains its bulk properties while its surface properties have been modified to desirably interact with the surrounding environment.
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Abstract : Report developed under STTR contract for topic AF02T007. The primary goal of this research is to establish the technical feasibility of using atomic layer deposition to produce composite thermite particles. Secondary goals were... more
Abstract : Report developed under STTR contract for topic AF02T007. The primary goal of this research is to establish the technical feasibility of using atomic layer deposition to produce composite thermite particles. Secondary goals were to establish the conditions for deposition of tin oxide, coat a quantity of aluminum particles with tin oxide, characterize and test the coated particles, design a larger scale system for deposition, and evaluate the economic feasibility of the process. Chemistry to deposit tin oxide on zirconia particles by atomic layer deposition was successfully developed. This established conditions to shift the chemistry to the desired aluminum particle substrate. Composite thermite particles were synthesized through this surface growth of tin oxide and were shown to be highly reactive. However, deposition was not as efficient on the aluminum particles as the zirconia particles. The measured reactivity is less than theoretically expected, however the tested particles had an atomic ratio of oxygen to aluminum of 0.28 instead of the optimum 1.5. The reactivity falls off rapidly as this ratio deviates from optimum. The process can be economically scaled in a fluidized bed with a cost of coating the particles estimated as $9/kg with a capital investment of $500,000.
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The effect of additives is investigated for the carbothermal reduction synthesis of nanophase silicon carbide/silicon nitride composite powders. Mixtures of silica, carbon, seed silicon nitride, and additive are reacted in a... more
The effect of additives is investigated for the carbothermal reduction synthesis of nanophase silicon carbide/silicon nitride composite powders. Mixtures of silica, carbon, seed silicon nitride, and additive are reacted in a thermogravimetric analyzer. The mass loss information combined with compositional and spectroscopic analysis allows product quality (morphology, surface area, a-Si3N4 and ß-SiC contents, oxygen content, etc.) information to be obtained.
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The present invention provides a method for carrying out high temperature thermal dissociation reactions requiring rapid-heating and short residence times using solar energy. In particular, the present invention provides a method for... more
The present invention provides a method for carrying out high temperature thermal dissociation reactions requiring rapid-heating and short residence times using solar energy. In particular, the present invention provides a method for carrying out high temperature thermal reactions such as dissociation of hydrocarbon containing gases and hydrogen sulfide to produce hydrogen and dry reforming of hydrocarbon containing gases with carbon
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A fluid-wall aerosol flow reactor has been used to thermally dissociate methane to carbon black and hydrogen. The reactor was heated to temperatures in excess of 2000 K by concentrated sunlight. Approximately 90% conversion of methane to... more
A fluid-wall aerosol flow reactor has been used to thermally dissociate methane to carbon black and hydrogen. The reactor was heated to temperatures in excess of 2000 K by concentrated sunlight. Approximately 90% conversion of methane to hydrogen has been obtained at a ...
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A fluid-wall aerosol flow reactor has been used to thermally dissociate methane to carbon black and hydrogen. The reactor was heated to temperatures in excess of 2000 K by concentrated sunlight. Approximately 90% conversion of methane to... more
A fluid-wall aerosol flow reactor has been used to thermally dissociate methane to carbon black and hydrogen. The reactor was heated to temperatures in excess of 2000 K by concentrated sunlight. Approximately 90% conversion of methane to hydrogen has been obtained at a ...
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... D. Noble, and Carl A. Koval . Departments of Chemical Engineering and of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309. Ind. Eng. Chem. Res. ... The results of Dulay and Fox demonstrated an enhancement... more
... D. Noble, and Carl A. Koval . Departments of Chemical Engineering and of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309. Ind. Eng. Chem. Res. ... The results of Dulay and Fox demonstrated an enhancement due to CPI in a TiO 2 catalyst slurry. ...
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... Richard D. Noble,* † Carl A. Koval, ‡ and William A. Jacoby § ‖. ... JG; Koval, CA; Noble, RD Evidence of Critical Illumination and Dark Recovery Times for Increasing the Photoefficiency of Aqueous Heterogeneous Photocatalysis. J.... more
... Richard D. Noble,* † Carl A. Koval, ‡ and William A. Jacoby § ‖. ... JG; Koval, CA; Noble, RD Evidence of Critical Illumination and Dark Recovery Times for Increasing the Photoefficiency of Aqueous Heterogeneous Photocatalysis. J. Photochem. Photobiol. A 1993, 74, 273. ...
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The effect of additives is investigated for the carbothermal reduction synthesis of nanophase silicon carbide/silicon nitride composite powders. Mixtures of silica, carbon, seed silicon nitride, and additive are reacted in a... more
The effect of additives is investigated for the carbothermal reduction synthesis of nanophase silicon carbide/silicon nitride composite powders. Mixtures of silica, carbon, seed silicon nitride, and additive are reacted in a thermogravimetric analyzer. The mass loss information combined with compositional and spectroscopic analysis allows product quality (morphology, surface area, α-Si3N4 and β-SiC contents, oxygen content, etc.) information to be obtained. It was observed that all of the additives used in this study increased the reaction rate. Lithium carbonate produced a silicon nitride/silicon carbide composite that was not significantly different from experiments without promoter. However, the product quality was severely affected in other instances.