Silicophosphate Gels by Nonhydrolytic Condensation Reactions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14740%2F11%3A00074155" target="_blank" >RIV/00216224:14740/11:00074155 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Silicophosphate Gels by Nonhydrolytic Condensation Reactions
Original language description
Phosphosilicate gel materials are usually synthesized from aqueous phosphoric acid and silicon alkoxides by hydrolysis. A high hydrolytic instability of the Si-O-P bonds leads to the products that are actually silicagels impregnated by aqueous H3PO4. Their calcination then provides crystalline silicophosphate phases. We prepared phosphosilicate gels by an elimination of acetic acid esters in heterocondensation reactions between Si(OC(O)CH3)4 and OP(OSiMe3)3 in nonaqueous organic solvents. 3 Si(OC(O)CH3)4 + 4 OP(OSiMe3)3 = 12 CH3C(O)OSiMe3 + Si3P4O16 While the ester elimination from metal alkoxides and silicon tetraacetate was reported previously, its application to phosphoric acid esters is new. The nonhydrolytic ester elimination provides clear amorphous phosphosilicate gels at room temperature with a high surface area up to 450 m2 g-1. Trimethylsilylester of acetic acid was identified by NMR and GC/MS as the elimination byproduct.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
CA - Inorganic chemistry
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů