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Hierarchically Structured Silica Monoliths

Published online by Cambridge University Press:  10 February 2011

Nicola Hüsing ,
Christina Raab  and
Viktoria Torma
Nicola Hüsing
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9 A-1060 Vienna, Austria, [email protected]
Christina Raab
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9 A-1060 Vienna, Austria, [email protected]
Viktoria Torma
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9 A-1060 Vienna, Austria, [email protected]
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Abstract

Large monoliths with periodic mesopores in a macroporous web-like network structure are prepared using a diol-modified silane as silica precursor and lyotropic liquid crystalline phases of surfactants in water as structure-directing agents. The surfactant concentration is varied from 5 to 40wt%. Highly porous materials are synthesized applying two different drying procedures: supercritical drying with CO2 or ethanol, in addition to ambient pressure drying including surfactant expulsion via silanisation treatments with trimethylchlorosilane or hexamethyl disilazane. The monolithic materials show a very unique macro- and mesostructure which is characterized by N2-sorption measurements, small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 775: Symposium P – Self-Assembled Nanostructured Materials , 2003 , P1.7
Copyright
Copyright © Materials Research Society 2003

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