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Title: 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:
 [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:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
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)
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 = {1996},
month = {1}
}

Patent:

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