Method for producing metal oxide aerogels having densities less than 0. 02 g/cc
Abstract
A two-step method is described for making transparent aerogels which have a density of less than 0.003 g/cm[sup 3] to those with a density of more than 0.8 g/cm[sup 3], by a sol/gel process and supercritical extraction. Condensed metal oxide intermediate made with purified reagents can be diluted to produce stable aerogels with a density of less than 0.02 g/cm[sup 3]. High temperature, direct supercritical extraction of the liquid phase of the gel produces hydrophobic aerogels which are stable at atmospheric moisture conditions. Monolithic, homogeneous silica aerogels with a density of less than 0.02 to higher than 0.8 g/cm[sup 3], with high thermal insulation capacity, improved mechanical strength and good optical transparency, are described. 7 figures.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 5158336
- Patent Number(s):
- 5275796
- Application Number:
- PPN: US 7-754349
- Assignee:
- Univ. of California, Oakland, CA ()
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 5 Sep 1991
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; FOAMS; FABRICATION; SILICON OXIDES; MECHANICAL PROPERTIES; OPTICAL PROPERTIES; SOL-GEL PROCESS; THERMAL INSULATION; CHALCOGENIDES; COLLOIDS; DISPERSIONS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SILICON COMPOUNDS; 360601* - Other Materials- Preparation & Manufacture
Citation Formats
Tillotson, T M, Poco, J F, Hrubesh, L W, and Thomas, I M. Method for producing metal oxide aerogels having densities less than 0. 02 g/cc. United States: N. p., 1994.
Web.
Tillotson, T M, Poco, J F, Hrubesh, L W, & Thomas, I M. Method for producing metal oxide aerogels having densities less than 0. 02 g/cc. United States.
Tillotson, T M, Poco, J F, Hrubesh, L W, and Thomas, I M. Tue .
"Method for producing metal oxide aerogels having densities less than 0. 02 g/cc". United States.
@article{osti_5158336,
title = {Method for producing metal oxide aerogels having densities less than 0. 02 g/cc},
author = {Tillotson, T M and Poco, J F and Hrubesh, L W and Thomas, I M},
abstractNote = {A two-step method is described for making transparent aerogels which have a density of less than 0.003 g/cm[sup 3] to those with a density of more than 0.8 g/cm[sup 3], by a sol/gel process and supercritical extraction. Condensed metal oxide intermediate made with purified reagents can be diluted to produce stable aerogels with a density of less than 0.02 g/cm[sup 3]. High temperature, direct supercritical extraction of the liquid phase of the gel produces hydrophobic aerogels which are stable at atmospheric moisture conditions. Monolithic, homogeneous silica aerogels with a density of less than 0.02 to higher than 0.8 g/cm[sup 3], with high thermal insulation capacity, improved mechanical strength and good optical transparency, are described. 7 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 04 00:00:00 EST 1994},
month = {Tue Jan 04 00:00:00 EST 1994}
}