Process for forming transparent aerogel insulating arrays

Tewari, Param H; Hunt, Arlon J

Title: Process for forming transparent aerogel insulating arrays

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Abstract

An improved supercritical drying process for forming transparent silica aerogel arrays is described. The process is of the type utilizing the steps of hydrolyzing and condensing aloxides to form alcogels. A subsequent step removes the alcohol to form aerogels. The improvement includes the additional step, after alcogels are formed, of substituting a solvent, such as CO.sub.2, for the alcohol in the alcogels, the solvent having a critical temperature less than the critical temperature of the alcohol. The resulting gels are dried at a supercritical temperature for the selected solvent, such as CO.sub.2, to thereby provide a transparent aerogel array within a substantially reduced (days-to-hours) time period. The supercritical drying occurs at about 40.degree. C. instead of at about 270.degree. C. The improved process provides increased yields of large scale, structurally sound arrays. The transparent aerogel array, formed in sheets or slabs, as made in accordance with the improved process, can replace the air gap within a double glazed window, for example, to provide a substantial reduction in heat transfer. The thus formed transparent aerogel arrays may also be utilized, for example, in windows of refrigerators and ovens, or in the walls and doors thereof or as the active material inmore »« less

Inventors:

Tewari, Param H ^[1]; Hunt, Arlon J ^[2]

Milpitas, CA
Oakland, CA

Issue Date:: 1986-01-01

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

OSTI Identifier:: 865977

Patent Number(s):: 4610863

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C01B33/1585 - {Dehydration into aerogels}

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B38/0045 - {by a process involving the formation of a sol or a gel, e.g. sol-gel or precipitation processes}

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}

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DOE Contract Number:: AC03-76SF00098

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: process; forming; transparent; aerogel; insulating; arrays; improved; supercritical; drying; silica; described; type; utilizing; steps; hydrolyzing; condensing; aloxides; form; alcogels; subsequent; step; removes; alcohol; aerogels; improvement; additional; formed; substituting; solvent; critical; temperature; resulting; gels; dried; selected; provide; array; substantially; reduced; days-to-hours; time; period; occurs; 40; degree; 270; provides; increased; yields; scale; structurally; sound; sheets; slabs; accordance; replace; air; gap; double; glazed; window; example; substantial; reduction; heat; transfer; utilized; windows; refrigerators; ovens; walls; doors; active; material; detectors; analyzing; energy; elementry; particles; cosmic; rays; provides increased; process provides; substantially reduced; air gap; improved process; critical temperature; active material; heat transfer; time period; substantially reduce; substantial reduction; resulting gels; structurally sound; transparent aerogel; increased yields; supercritical drying; drying process; supercritical temperature; silica aerogel; subsequent step; cosmic rays; type utilizing; increased yield; transparent silica; forming transparent; additional step; aerogel insulating; double glazed; /423/502/

Citation Formats


                    Tewari, Param H, and Hunt, Arlon J. Process for forming transparent aerogel insulating arrays.  United States: N. p., 1986. 
        Web.

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                    Tewari, Param H, & Hunt, Arlon J. Process for forming transparent aerogel insulating arrays.  United States.

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                    Tewari, Param H, and Hunt, Arlon J. Wed .  
        "Process for forming transparent aerogel insulating arrays".  United States.  https://www.osti.gov/servlets/purl/865977.

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@article{osti_865977,

  title        = {Process for forming transparent aerogel insulating arrays},

  author       = {Tewari, Param H and Hunt, Arlon J},

  abstractNote = {An improved supercritical drying process for forming transparent silica aerogel arrays is described. The process is of the type utilizing the steps of hydrolyzing and condensing aloxides to form alcogels. A subsequent step removes the alcohol to form aerogels. The improvement includes the additional step, after alcogels are formed, of substituting a solvent, such as CO.sub.2, for the alcohol in the alcogels, the solvent having a critical temperature less than the critical temperature of the alcohol. The resulting gels are dried at a supercritical temperature for the selected solvent, such as CO.sub.2, to thereby provide a transparent aerogel array within a substantially reduced (days-to-hours) time period. The supercritical drying occurs at about 40.degree. C. instead of at about 270.degree. C. The improved process provides increased yields of large scale, structurally sound arrays. The transparent aerogel array, formed in sheets or slabs, as made in accordance with the improved process, can replace the air gap within a double glazed window, for example, to provide a substantial reduction in heat transfer. The thus formed transparent aerogel arrays may also be utilized, for example, in windows of refrigerators and ovens, or in the walls and doors thereof or as the active material in detectors for analyzing high energy elementry particles or cosmic rays.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1986},

  month        = {1}

}

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