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Title: Preparation of high porosity xerogels by chemical surface modification.

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.
 [1];  [2];  [3]
  1. (51 Michelle Dr. Apt. A 11, Lancaster, PA 17603)
  2. (1412 Marquette Pl. NE., Albuquerque, NM 87122)
  3. (14 Eagle Nest Dr. NE., Albuquerque, NM 87122)
Issue Date:
OSTI Identifier:
Deshpande, Ravindra (51 Michelle Dr. Apt. A 11, Lancaster, PA 17603);Smith, Douglas M. (1412 Marquette Pl. NE., Albuquerque, NM 87122);Brinker, C. Jeffrey (14 Eagle Nest Dr. NE., Albuquerque, NM 87122) SNL
Patent Number(s):
US 5565142
Contract Number:
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
preparation; porosity; xerogels; chemical; surface; modification; provides; extremely; porous; xerogel; dried; vacuum-to-below; supercritical; pressures; properties; aerogels; typically; reacting; internal; pore; wet; organic; substances; change; contact; angle; fluid; meniscus; pores; drying; shrinkage; normally; prevented; autoclave; temperature; pressure; critical; values; avoided; vacuum; ambient; surface modification; ambient pressure; pore fluid; ambient pressures; contact angle; chemical surface; organic substance; organic substances; critical pressure; critical value; /252/423/427/428/501/516/