Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1991-09-05
1994-01-04
Chaudhuri, Olik
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
502233, 25231501, 2523156, C01B 3312, B01J 2100
Patent
active
052757960
ABSTRACT:
A two-step method is described for making transparent aerogels which have a density of less than 0.003 g/cm.sup.3 to those with a density of more than 0.8 g/cm.sup.3, by a sol/gel process and supercritical extraction. Condensed metal oxide intermediate made with purified reagents can be diluted to produce stable aerogels with a density of less than 0.02 g/cm.sup.3. High temperature, direct supercritical extraction of the liquid phase of the gel produces hydrophobic aerogels which are stable at atmospheric moisture conditions. Monolithic, homogeneous silica aerogels with a density of less than 0.02 to higher than 0.8 g/cm.sup.3, with high thermal insulation capacity, improved mechanical strength and good optical transparency, are described.
REFERENCES:
patent: 4610863 (1986-09-01), Tewari et al.
patent: 4717708 (1988-01-01), Cheng et al.
patent: 4806328 (1989-02-01), Van Lierop et al.
patent: 4810674 (1989-03-01), Che et al.
patent: 4911903 (1990-03-01), Unger et al.
S. A. Steward et al., "Silica Aerogel Process Optimization", UCRL-101606 Abst, Abst. of Presentation at Meeting on Scientific Computing and Automation, Philadelphia, Pa. (Oct. 10-13, 1989).
T. M. Tillotson et al., "Partially Hydrolyzed Alkoxysilanes as Precursors for Silica Aerogels", UCRL-9734 Ext Abs, Materials Research Soc., Pittsburgh, Pa. (Apr. 1988), pp. 685-689.
L. W. Hrubesh, "Development of Low Density Silica Aerogel as a Capture Media for Hyper-Velocity Particles", UCRL-21234, Summary Report FY 1989, NASA-Jet Propulsion Lab., Pasadena, Calif. 91109 (Oct. 1989).
Hrubesh Lawrence W.
Poco John F.
Thomas Ian M.
Tillotson Thomas M.
Chaudhuri Olik
Grzybicki Daryl S.
Horton Ken
Regents of the University of California
Sartorio Henry P.
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