Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1981-07-06
1983-09-06
Cooper, Jack
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
C01B 33158
Patent
active
044029276
ABSTRACT:
Silica aerogel in the form of a substantially crack-free, preferably transparent block is described, together with a method for the preparation of such aerogel and use thereof in solar panels. The preparation is effected by means of hydrolysis of a tetraalkoxysilane, preferably tetramethoxysilane, in an alcohol, preferably methanol, in the presence of a catalyst, preferably ammonia, for the formation of an alcogel which is aged for approximately 10 days and washed with alcohol for removing water. The alcogel is thereafter treated in an autoclave by means of a temperature increase to above the critical point of the alcohol, isothermic pressure drop by means of the release of alcohol vapor, and temperature drop. The temperature increase, the pressure drop and the temperature drop take place at such low mean rates that the aerogel does not crack. To this end, a total treatment time in the autoclave of at least 24 hours is required. After the autoclave treatment, a heat treatment at 500.degree. to 750.degree. C. is possibly carried out for further improving the transparency of the aerogel.
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patent: 4076651 (1978-02-01), Jaques
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Henning Sten A.
Svensson Leif O. G.
von Dardel Guy
Cooper Jack
Geoffrey, Jr. Eugene E.
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