About: Silicophosphate Gels by Nonhydrolytic Condensation Reactions

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. 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. (en)
Title	Silicophosphate Gels by Nonhydrolytic Condensation Reactions Silicophosphate Gels by Nonhydrolytic Condensation Reactions (en)
skos:prefLabel	Silicophosphate Gels by Nonhydrolytic Condensation Reactions Silicophosphate Gels by Nonhydrolytic Condensation Reactions (en)
skos:notation	RIV/00216224:14740/11:00074155!RIV15-MSM-14740___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(ED1.1.00/02.0068), P(GA203/08/1111), P(LH11028), S
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Pinkas, Jiří Moravec, Zdeněk Stýskalík, Aleš Škoda, David
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Středoevropský technologický institut
http://linked.open...dnocenehoVysledku	229246
http://linked.open...ai/riv/idVysledku	RIV/00216224:14740/11:00074155
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Silicophosphate; Gels; Non-hydrolytic (en)
http://linked.open.../riv/klicoveSlovo	Gels Silicophosphate Non-hydrolytic
http://linked.open...ontrolniKodProRIV	[71E446F46291]
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Synthesis and properties of inorganic-organic polymeric materials Central european institute of technology Nonhydrolytic Sol-Gel Reactions for the Synthesis of Silicates and Phosphates with Controlled Porosity and Surface Functionality
http://linked.open...UplatneniVysledku	2011
http://linked.open...iv/tvurceVysledku	Moravec, Zdeněk Pinkas, Jiří Škoda, David Stýskalík, Aleš Barnes, Craig E.
http://localhost/t...ganizacniJednotka	14740

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