Method for producing metal oxide aerogels

Tillotson, T M; Poco, J F; Hrubesh, L W; Thomas, I M

Title: Method for producing metal oxide aerogels

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Abstract

A two-step hydrolysis-condensation method was developed to form metal oxide aerogels of any density, including densities of less than 0.003g/cm{sup 3} and greater than 0.27g/cm{sup 3}. High purity metal alkoxide is reacted with water, alcohol solvent, and an additive to form a partially condensed metal intermediate. All solvent and reaction-generated alcohol is removed, and the intermediate is diluted with a nonalcoholic solvent. The intermediate can be stored for future use to make aerogels of any density. The aerogels are formed by reacting the intermediate with water, nonalcoholic solvent, and a catalyst, and extracting the nonalcoholic solvent directly. The resulting monolithic aerogels are hydrophobic and stable under atmospheric conditions, and exhibit good optical transparency, high clarity, and homogeneity. The aerogels have high thermal insulation capacity, high porosity, mechanical strength and stability, and require shorter gelation times than aerogels formed by conventional methods. 8 figs.

Inventors:: Tillotson, T M; Poco, J F; Hrubesh, L W; Thomas, I M

Issue Date:: 1995-04-25

Research Org.:: Univ. of California (United States)

OSTI Identifier:: 46300

Patent Number(s):: 5409683

Application Number:: PAN: 8-272,432

Assignee:: Univ. of California, Oakland, CA (United States)

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Resource Relation:: Other Information: PBD: 25 Apr 1995

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 40 CHEMISTRY; GELS; SYNTHESIS; PHYSICAL PROPERTIES; MECHANICAL PROPERTIES; THERMAL INSULATION; ALKOXIDES; CHEMICAL REACTIONS; REACTION INTERMEDIATES; SOLVENTS; OPTICAL PROPERTIES; HYDROLYSIS; DEHYDROCYCLIZATION

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                    Tillotson, T M, Poco, J F, Hrubesh, L W, and Thomas, I M. Method for producing metal oxide aerogels.  United States: N. p., 1995. 
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                    Tillotson, T M, Poco, J F, Hrubesh, L W, & Thomas, I M. Method for producing metal oxide aerogels.  United States.

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                    Tillotson, T M, Poco, J F, Hrubesh, L W, and Thomas, I M. Tue .  
        "Method for producing metal oxide aerogels".  United States.

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@article{osti_46300,

  title        = {Method for producing metal oxide aerogels},

  author       = {Tillotson, T M and Poco, J F and Hrubesh, L W and Thomas, I M},

  abstractNote = {A two-step hydrolysis-condensation method was developed to form metal oxide aerogels of any density, including densities of less than 0.003g/cm{sup 3} and greater than 0.27g/cm{sup 3}. High purity metal alkoxide is reacted with water, alcohol solvent, and an additive to form a partially condensed metal intermediate. All solvent and reaction-generated alcohol is removed, and the intermediate is diluted with a nonalcoholic solvent. The intermediate can be stored for future use to make aerogels of any density. The aerogels are formed by reacting the intermediate with water, nonalcoholic solvent, and a catalyst, and extracting the nonalcoholic solvent directly. The resulting monolithic aerogels are hydrophobic and stable under atmospheric conditions, and exhibit good optical transparency, high clarity, and homogeneity. The aerogels have high thermal insulation capacity, high porosity, mechanical strength and stability, and require shorter gelation times than aerogels formed by conventional methods. 8 figs.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1995},

  month        = {4}

}

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