Issue 35-36, 2005
From the journal:

Journal of Materials Chemistry

Simultaneous drying and chemical modification of hierarchically organized silica monoliths with organofunctional silanes

Doris Brandhuber,a   Herwig Peterlikb  and  Nicola Hüsing*c  

* Corresponding authors

a Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria

b Institute of Materials Physics, University of Vienna, Vienna, Austria

c Inorganic Chemistry I, University of Ulm, Albert-Einstein-Allee 11, Ulm, Germany
E-mail: nicola.huesing@uni-ulm.de
Fax: +49 731 5022733
Tel: +49 731 5022730

Abstract

Large, low density silica monoliths with a hierarchical organisation of macro- and periodically arranged mesopores are prepared by a true liquid crystal templating approach of an ethylene glycol-modified silane in the presence of a non-ionic block copolymer surfactant and subsequent drying of the wet gels with organosilanes. In this approach the silanes serve two functions: first, the silylation reactions allow for non-destructive drying of the monolithic gels and simultaneous extraction of the block copolymer template; second, they serve as surface functionalization agent. A variety of organofunctional silanes such as trimethylchlorosilane, 3-mercaptopropyltrimethoxysilane, phenyl-trimethoxysilane, 3-[(2,2-dimethyl-1-aza-2-silacyclopent-1-yl)dimethylsilyl]-1-propanamine, a cyclic silazane resulting in aminopropyldimethylsilyl groups on the silica surface, and (methylmethacryloyl)dimethyl-methoxysilane, has been successfully applied in the interfacial modification of the silica surface. The resulting silica monoliths were characterized with respect to their structure by SEM, SAXS, and nitrogen sorption and with respect to their chemical composition by elemental analysis, titrations and MAS-NMR spectroscopy.

Graphical abstract: Simultaneous drying and chemical modification of hierarchically organized silica monoliths with organofunctional silanes

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Article information

DOI
https://doi.org/10.1039/B505976C
Article type
Paper
Submitted
28 Apr 2005
Accepted
14 Jun 2005
First published
11 Jul 2005

J. Mater. Chem., 2005,15, 3896-3902

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Simultaneous drying and chemical modification of hierarchically organized silica monoliths with organofunctional silanes

D. Brandhuber, H. Peterlik and N. Hüsing, J. Mater. Chem., 2005, 15, 3896 DOI: 10.1039/B505976C

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