Preparation of high porosity xerogels by chemical surface modification.
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.
- Inventors:
-
- 51 Michelle Dr. Apt. A 11, Lancaster, PA 17603
- 1412 Marquette Pl. NE., Albuquerque, NM 87122
- 14 Eagle Nest Dr. NE., Albuquerque, NM 87122
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 870640
- Patent Number(s):
- 5565142
- Assignee:
- 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)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
- DOE Contract Number:
- AC04-76
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 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/
Citation Formats
Deshpande, Ravindra, Smith, Douglas M, and Brinker, C Jeffrey. Preparation of high porosity xerogels by chemical surface modification.. United States: N. p., 1996.
Web.
Deshpande, Ravindra, Smith, Douglas M, & Brinker, C Jeffrey. Preparation of high porosity xerogels by chemical surface modification.. United States.
Deshpande, Ravindra, Smith, Douglas M, and Brinker, C Jeffrey. Mon .
"Preparation of high porosity xerogels by chemical surface modification.". United States. https://www.osti.gov/servlets/purl/870640.
@article{osti_870640,
title = {Preparation of high porosity xerogels by chemical surface modification.},
author = {Deshpande, Ravindra and Smith, Douglas M and Brinker, C Jeffrey},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1996},
month = {Mon Jan 01 00:00:00 EST 1996}
}
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