Processes for the chemical modification of inorganic aerogels

Details Processes for the chemical modification of inorganic aerogels Processes for the chemical modification of inorganic aerogels

1996-08-16

1999-12-21

Gorgos, Kathryn L.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415743, 20415745, 20415747, 20415748, 20415751, 20415774, 20415781, 423338, C07C 100, C01B 5300, C01B 2500, B05D 304

Patent

active

060044365

ABSTRACT:
A process is described to modify the chemical structure of an aerogel under conditions which inhibit plasma formation within the aerogel pores, which process includes; (a) providing an aerogel with a pore size of less than 0.1.mu.; (b) exposing the initial aerogel to at least one gas selected from the group consisting of reducing gas, oxidizing gas, noble gas and combinations thereof, with the proviso that at least one reducing gas or one oxidizing gas is present; and (c) irradiating the combination of step (b) while maintaining the temperature to preserve the structural composition of the aerogel at a pressure of between about 0.1 and 54 Torr for between and about 5 and 960 minutes. This process produces a modified aerogel wherein the pore size does not allow for plasma formation within the pore. Chemical reactions occur within the pores of the aerogel of a nonplasma nature. These modified aerogels have a number of uses, including catalysts, ceramics, composites, chemical sensors, LED's and the like.

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