Preparation of high porosity xerogels by chemical surface modifi

Details Preparation of high porosity xerogels by chemical surface modifi Preparation of high porosity xerogels by chemical surface modifi

1993-04-28

1996-10-15

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

252 62, 2523156, 2523157, 423338, 427220, 428405, 501 12, B01J 1300, B05D 700, C03C 1730, E04B 174

Patent

active

055651429

ABSTRACT:
This invention provides an extremely porous xerogel dried at vacuum-to-below supercritical pressures but having the properties of aerogels which are typically dried at supercritical pressures. This is done by reacting the internal pore surface of the wet gel with organic substances in order to change the contact angle of the fluid meniscus in the pores during drying. Shrinkage of the gel (which is normally prevented by use of high autoclave pressures, such that the pore fluid is at temperature and pressure above its critical values) is avoided even at vacuum or ambient pressures.

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Fred W. Billmeyer,Jr.: Textbook of Polymer Science, Third Edition (1984) pp. 448-450.

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