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Title: Transparent monolithic metal ion containing nanophase aerogels

The formation of monolithic and transparent transition metal containing aerogels has been achieved through cooperative interactions of high molecular weight functionalized carbohydrates and silica precursors, which strongly influence the kinetics of gelation. After initial gelation, subsequent modification of the ligating character of the system, coordination of the group VIII metal ions, and supercritical extraction afford the aerogels. The structures at the nanophase level have been probed by photon and electron transmission and neutron scattering techniques to help elucidate the basis for structural integrity together with the small entity sizes that permit transparency in the visible range. They also help with understanding the chemical reactivities of the metal-containing sites in these very high surface area materials. These results are discussed in connection with new reaction studies.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
750610
Report Number(s):
ANL/IPNS/CP-100631
TRN: AH200019%%103
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 2000 MRS Spring Meeting, San Francisco, CA (US), 04/24/2000--04/28/2000; Other Information: PBD: 1 Dec 1999
Research Org:
Argonne National Lab., IL (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GELS; TRANSITION ELEMENTS; OPACITY; PRECURSOR; GELATION; SUPERCRITICAL GAS EXTRACTION; MICROSTRUCTURE; ACTIVATION ENERGY; SURFACE AREA; SILICA; CATALYSTS