Synthesis of homogeneous silicophosphate xerogels by non-hydrolytic condensation reactions

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Publikace nespadá pod Filozofickou fakultu, ale pod Středoevropský technologický institut. Oficiální stránka publikace je na webu muni.cz.
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STÝSKALÍK Aleš ŠKODA David MORAVEC Zdeněk ABBOTT JG BARNES CE PINKAS Jiří

Rok publikování 2014
Druh Článek v odborném periodiku
Časopis / Zdroj MICROPOROUS AND MESOPOROUS MATERIALS
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www http://www.sciencedirect.com/science/article/pii/S1387181114003370#
Doi http://dx.doi.org/10.1016/j.micromeso.2014.06.019
Obor Anorganická chemie
Klíčová slova Sol-Gel; Non-hydrolytic; Silicophosphate; Phosphosilicate; Xerogel
Popis A novel non-hydrolytic synthesis of silicophosphate xerogels and optimization of reaction conditions to obtain products with a high degree of condensation and a large specific surface area are presented. Homogeneous products with a high content of Si-O-P bonds and SiO6 moieties were synthesized by an ester elimination route at low temperature from silicon acetate, Si(OAc)(4), and tris(trimethylsilyl) phosphate, OP(OSiMe3)(3) (TTP). Depending on the reaction conditions (temperature, solvent, time) it was possible to control the degree of condensation (up to 85.7%) and porosity of amorphous xerogels (apparent surface areas from 230 to 568 m(2) g(-1)). The composition and morphology of the xerogels, volatile reaction byproducts, thermal transformations and surface modification with methanol were followed by elemental analysis, IR spectroscopy, thermal analysis TG-DSC, nitrogen adsorption, C-13, Si-29, and P-31 solid-state NMR spectroscopy, and powder XRD. (C) 2014 Elsevier Inc. All rights reserved.
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