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Title: Method for rapidly producing microporous and mesoporous materials

Abstract

An improved, rapid process is provided for making microporous and mesoporous materials, including aerogels and pre-ceramics. A gel or gel precursor is confined in a sealed vessel to prevent structural expansion of the gel during the heating process. This confinement allows the gelation and drying processes to be greatly accelerated, and significantly reduces the time required to produce a dried aerogel compared to conventional methods. Drying may be performed either by subcritical drying with a pressurized fluid to expel the liquid from the gel pores or by supercritical drying. The rates of heating and decompression are significantly higher than for conventional methods.

Inventors:
 [1];  [1];  [2];  [3]
  1. Livermore, CA
  2. Pleasanton, CA
  3. Danville, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
871221
Patent Number(s):
5686031
Assignee:
Regents of University of California (Oakland, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; rapidly; producing; microporous; mesoporous; materials; improved; rapid; process; provided; including; aerogels; pre-ceramics; precursor; confined; sealed; vessel; prevent; structural; expansion; heating; confinement; allows; gelation; drying; processes; greatly; accelerated; significantly; reduces; time; required; produce; dried; aerogel; compared; conventional; methods; performed; subcritical; pressurized; fluid; expel; liquid; pores; supercritical; rates; decompression; significantly reduce; time required; conventional methods; porous material; pressurized fluid; porous materials; significantly reduces; producing microporous; mesoporous material; supercritical drying; drying process; heating process; rapid process; mesoporous materials; prevent structural; /264/

Citation Formats

Coronado, Paul R, Poco, John F, Hrubesh, Lawrence W, and Hopper, Robert W. Method for rapidly producing microporous and mesoporous materials. United States: N. p., 1997. Web.
Coronado, Paul R, Poco, John F, Hrubesh, Lawrence W, & Hopper, Robert W. Method for rapidly producing microporous and mesoporous materials. United States.
Coronado, Paul R, Poco, John F, Hrubesh, Lawrence W, and Hopper, Robert W. Wed . "Method for rapidly producing microporous and mesoporous materials". United States. https://www.osti.gov/servlets/purl/871221.
@article{osti_871221,
title = {Method for rapidly producing microporous and mesoporous materials},
author = {Coronado, Paul R and Poco, John F and Hrubesh, Lawrence W and Hopper, Robert W},
abstractNote = {An improved, rapid process is provided for making microporous and mesoporous materials, including aerogels and pre-ceramics. A gel or gel precursor is confined in a sealed vessel to prevent structural expansion of the gel during the heating process. This confinement allows the gelation and drying processes to be greatly accelerated, and significantly reduces the time required to produce a dried aerogel compared to conventional methods. Drying may be performed either by subcritical drying with a pressurized fluid to expel the liquid from the gel pores or by supercritical drying. The rates of heating and decompression are significantly higher than for conventional methods.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {1}
}

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Works referenced in this record:

Stress development during supercritical drying
journal, January 1992


The Processing and Characterization of DCCA Modified Gel-Derived Silica
journal, January 1984


A new Method of Preparation of Aerogel-Like Materials Using a Freeze-Drying Process
journal, April 1989


Freeze Drying of Silica gels Prepared from Siliciumethoxid
journal, April 1989


Drying Methods Preserving the Textural Properties of gels
journal, April 1989


Physicochemical transformation of silica gels during hypercritical drying
journal, January 1992


Supercritical drying of gels
journal, January 1986


Pore Structure Evolution of Silica Gel during Aging/ drying: Effect of Surface Tension
journal, January 1992