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  • Inorganic and Physical Chemistry  (2)
  • Communications and Radar  (1)
  • FABRICATION TECHNOLOGY  (1)
  • 1
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    Adhesion Casting In Low Gravity (1996)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Adhesion casting in low gravity proposed as technique for making new and improved materials. Advantages of low-gravity adhesion casting, in comparison with adhesion casting in normal Earth gravity, comes from better control over, and greater uniformity of, thicknesses of liquid films that form on and adhere to solid surfaces during casting.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28908 , NASA Tech Briefs (ISSN 0145-319X); 20; 1; P. 78
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    NASA TECHNICAL REPORTS
  • 2
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    Large-Scale Sakharov Condition (1999)
    In:  Other Sources
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    Publication Date: 2019-07-17
    Description: Recent far-reaching theoretical results have used the quantum vacuum noise as a fundamental electromagnetic radiation field to derive a frequency (w) -dependent version of Newton's gravitational coupling term, G(w). This paper reconciles the cutoff frequency with the observed cosmological constant, then briefly puts forward a realizable laboratory test case in the 10-100 Mhz frequency range. One analogy is drawn between the classical vacuum energy experiments with attraction between two closely spaced plates (Casimir cavity) and the arbitrarily dense material boundaries possible in Bose condensates, such as irradiation at Mhz frequencies of superfluid helium or superconductors.
    Keywords: Communications and Radar
    Type: Joint Propulsion; Jun 21, 1999; Los Angeles, CA; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Surface Plasmon Resonance Evaluation of Colloidal Metal Aerogel Filters (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We have fabricated aerogels containing gold, silver, and platinum nanoparticles for gas catalysis applications. By applying the concept of an average or effective dielectric constant to the heterogeneous interlayer surrounding each particle, we extend the technique of immersion spectroscopy to porous or heterogeneous media. Specifically, we apply the predominant effective medium theories for the determination of the average fractional composition of each component in this inhomogeneous layer. Hence, the surface area of metal available for catalytic gas reaction is determined. The technique is satisfactory for statistically random metal particle distributions but needs further modification for aggregated or surfactant modified systems. Additionally, the kinetics suggest that collective particle interactions in coagulated clusters are perturbed during silica gelation resulting in a change in the aggregate geometry.
    Keywords: Inorganic and Physical Chemistry
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    NASA TECHNICAL REPORTS
  • 4
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    Noble Metal Immersion Spectroscopy of Silica Alcogels and Aerogels (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We have fabricated aerogels containing gold and silver nanoparticles for gas catalysis applications. By applying the concept of an average or effective dielectric constant to the heterogeneous interlayer surrounding each particle, we extend the technique of immersion spectroscopy to porous or heterogeneous media. Specifically, we apply the predominant effective medium theories for the determination of the average fractional composition of each component in this inhomogeneous layer. Hence, the surface area of metal available for catalytic gas reaction is determined. The technique is satisfactory for statistically random metal particle distributions but needs further modification for aggregated or surfactant modified systems. Additionally, the kinetics suggest that collective particle interactions in coagulated clusters are perturbed during silica gelation resulting in a change in the aggregate geometry.
    Keywords: Inorganic and Physical Chemistry
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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