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  • 1
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    Fluidized-Bed Particles Scavenge Silicon Fines (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Waste reduced, and silicon production rate improved. In new process silicon formed by thermal decomposition of SiH4. Part of silicon formed on silicon seed particles as result of surface chemical reaction. However, silicon formed by homogeneous reaction in gas phase tends to form aggregates of silicon atoms, which appear as fine particles (like dust). Believed that scavenging action of seed particles enables large fraction fines to be incorporated onto seed surface. This mode of growth confirmed by electron microscopy photographs.
    Keywords: MATERIALS
    Type: NPO-16034 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 98
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Producing Silicon Carbide for Semiconductor Devices (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Processes proposed for production of SiC crystals for use in semiconductors operating at temperatures as high as 900 degrees C. Combination of new processes produce silicon carbide chips containing epitaxial layers. Chips of SiC first grown on porous carbon matrices, then placed in fluidized bed, where additional layer of SiC grows. Processes combined to yield complete process. Liquid crystallization process used to make SiC particles or chips for fluidized-bed process.
    Keywords: MATERIALS
    Type: NPO-16391 , NASA Tech Briefs (ISSN 0145-319X); 9; 3; P. 103
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    NASA TECHNICAL REPORTS
  • 3
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    Extracting Silicon Product From Fluidized-Bed Reactors (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Silicon particles continuously removed from bottom of fluidizedbed reactor when grown to large size. In reactor, silane (SiH4) flows through bed of small silicon seed particles at temperature of 650 degrees to 700 degrees C. Silane decomposes into silicon vapor and hydrogen gas, and vapor deposits as solid on seed particles. With withdrawal system, reactor operates continuously.
    Keywords: MATERIALS
    Type: NPO-16385 , NASA Tech Briefs (ISSN 0145-319X); 9; 3; P. 96
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    NASA TECHNICAL REPORTS
  • 4
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    Membranes Remove Metal Ions Fron Industrial Liquids (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Use of membrane films affords convenient and economical alternative for removing and recovering metal cations present in low concentrations from large quantities of liquid solutions. Possible applications of membrane films include use in analytical chemistry for determination of small amounts of toxic metallic impurities in lakes, streams, and municipal effluents. Also suitable for use as absorber of certain pollutant gases and odors present in confined areas.
    Keywords: MATERIALS
    Type: LEW-13853 , NASA Tech Briefs (ISSN 0145-319X); 7; 2; P. 167
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    NASA TECHNICAL REPORTS
  • 5
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    Coal desulfurization with iron pentacarbonyl (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Coal desulfurization with iron pentacarbonyl treatment under mild conditions removes up to eighty percent of organic sulfur. Preliminary tests on treatment process suggest it may be economical enough to encourage investigation of use for coal desulfurization. With mild operating conditions, process produces environmentally-acceptable clean coal at reasonable cost.
    Keywords: MATERIALS
    Type: NPO-14272 , NASA Tech Briefs (ISSN 0145-319X); 3; 3; P. 361
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    NASA TECHNICAL REPORTS
  • 6
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    High-Purity Silicon Seeds for Silane Pyrolysis (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Seed particles for fluidized-bed production of silicon made by new contamination-free, economical method. In new method, large particles of semiconductor-grade silicon fired at each other by high-speed streams of gas and thereby break up into particles of suitable size for fluidized bed. No foreign materials introduced, and leaching unnecessary. Method used to feed fluidized-bed reactor for continuous production of high-purity silicon.
    Keywords: MATERIALS
    Type: NPO-16287 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 90
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    NASA TECHNICAL REPORTS
  • 7
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    Model of silicon production in a fluidized-bed reactor (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Mathematical model of fluidized-bed process for making high-purity silicon suitable for use in solar cell production can help evaluate potential performance and economics of such processes.
    Keywords: MATERIALS
    Type: NPO-14404 , NASA Tech Briefs (ISSN 0145-319X); 3; 4; P. 544
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  • 8
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    Irradiation pretreatment for coal desulfurization (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Process using highly-penetrating nuclear radiation (Beta and Gamma radiation) from nuclear power plant radioactive waste to irradiate coal prior to conventional desulfurization procedures increases total extraction of sulfur.
    Keywords: MATERIALS
    Type: NPO-14104 , NASA Tech Briefs (ISSN 0145-319X); 4; 1; P. 68
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    NASA TECHNICAL REPORTS
  • 9
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    Surfactant-assisted coal liquefaction (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improved process of coal liquefaction utilizing nonaqueous surfactant has increased oil yield from 50 to about 80%. Asphaltene molecule formation of colloid particles is prevented by surfactant. Separated molecules present more surface area for hydrogenation reaction. Lower requirements for temperature, pressure, and hydrogen lead to reduction in capital and operation costs.
    Keywords: MATERIALS
    Type: NPO-13904 , NASA Tech Briefs (ISSN 0145-319X); 1; 4; P. 574
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  • 10
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    New urea-absorbing polymers for artificial kidney machines (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Etherified polymer is made from modified cellulose derivative which is reacted with periodate. It will absorb 2 grams of urea per 100 grams of polymer. Indications are that polymers could be used to help remove uremic wastes in artificial kidneys, or they could be administered orally as therapy for uremia.
    Keywords: MATERIALS
    Type: NPO-13620
    Format: application/pdf
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