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@proceedings{1211445,
author = {Stýskalík, Aleš and Barnes, Craig Elliot and Pinkas, Jiří},
booktitle = {244th National Fall Meeting of the American-Chemical-Society (ACS), Philadelphia},
keywords = {silicophosphate; bronsted; lewis; acidity; non-hydrolytic; sol-gel},
language = {eng},
title = {Surface modification of phosphosilicate gels: Control of composition, porosity, acidity, and hydrophobicity},
year = {2012}
}
TY - CONF
ID - 1211445
AU - Stýskalík, Aleš - Barnes, Craig Elliot - Pinkas, Jiří
PY - 2012
TI - Surface modification of phosphosilicate gels: Control of composition, porosity, acidity, and hydrophobicity
KW - silicophosphate
KW - bronsted
KW - lewis
KW - acidity
KW - non-hydrolytic
KW - sol-gel
N2 - We developed a non-hydrolytic sol-gel synthesis of phosphosilicate gels and hybrid organic-inorganic materials from silicon acetates and trimethylsilyl phosphates and. The inorganic microporous SiOP frameworks with residual surface organic groups was built in a polycondensation reactions within the elimination of acetic acid ester. Herein we report chemical modification reactions of residual acetoxy and trimethylsilyloxy groups by variety of compounds (SiCl4, POCl3, RSiCl3, AlX3, ROH, Me3SiOSiMe3). Our aim was to show the versatility of the primarily synthesized phosphosilicate xerogels in tuning their properties. As an example, the phosphosilicate gels can be modified by alcohols to form Brônsted acidic POH groups on one hand and by aluminum compounds to form Lewis acidic four-coordinated Al atoms on the other hand. The obtained materials and by-products were characterized by liquid and solid-state NMR, IR, BET and elemental analyses.
ER -
STÝSKALÍK, Aleš, Craig Elliot BARNES and Jiří PINKAS. Surface modification of phosphosilicate gels: Control of composition, porosity, acidity, and hydrophobicity. In \textit{244th National Fall Meeting of the American-Chemical-Society (ACS), Philadelphia}. 2012. ISSN~0065-7727.
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