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Chemically Layered Porous SolidsAerogels and other porous solids in which surfaces of pores have chemical properties varying with depth below macroscopic surfaces prepared by sequences of chemical treatments. Porous glass or silica bead treated to make two depth zones having different chemical properties. Beads dropped along tube filled with flowing gas containing atomic oxygen, generated in microwave discharge. General class of materials treatable include oxides of aluminum, silicon, zirconium, tin, titanium, and nickel, and mixtures of these oxides. Potential uses of treated materials include chromatographic separations, membrane separations, controlled releases of chemicals, and catalysis.
Document ID
19910000511
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Koontz, Steve
(NASA Lyndon B. Johnson Space Center, Houston, TX.)
Date Acquired
August 14, 2013
Publication Date
October 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 10
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
MSC-21487
Accession Number
91B10511
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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