Title: Method for making monolithic metal oxide aerogels

Abstract

Transparent, monolithic metal oxide aerogels of varying densities are produced using a method in which a metal alkoxide solution and a catalyst solution are prepared separately and reacted. The resulting hydrolyzed-condensed colloidal solution is gelled, and the wet gel is contained within a sealed, but gas permeable, containment vessel during supercritical extraction of the solvent. The containment vessel is enclosed within an aqueous atmosphere that is above the supercritical temperature and pressure of the solvent of the metal alkoxide solution.

Inventors:

Coronado, Paul R ^[1]

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1. Livermore, CA

Issue Date:

1999-01-01

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

OSTI Identifier:

872537

Patent Number(s):

5958363

Assignee:

Regents of University of California (Oakland, CA)

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

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J13/0091 - {Preparation of aerogels, e.g. xerogels}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C01B13/32 - by oxidation or hydrolysis of elements or compounds in the liquid or solid state {or in non-aqueous solution, e.g. sol-gel process}
C01B33/1585 - {Dehydration into aerogels}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F

C01G35/00 - Compounds of tantalum

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

C01P2006/10 - Solid density
C01P2006/12 - Surface area

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

Y02P20/54 - characterised by the solvent

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DOE Contract Number:  

W-7405-ENG-48

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

method; monolithic; metal; oxide; aerogels; transparent; varying; densities; produced; alkoxide; solution; catalyst; prepared; separately; reacted; resulting; hydrolyzed-condensed; colloidal; gelled; wet; contained; sealed; gas; permeable; containment; vessel; supercritical; extraction; solvent; enclosed; aqueous; atmosphere; temperature; pressure; oxide aerogels; metal alkoxide; supercritical extraction; critical temperature; containment vessel; metal oxide; gas permeable; varying densities; colloidal solution; monolithic metal; supercritical temperature; alkoxide solution; catalyst solution; oxide solution; prepared separately; /423/501/