Mixed silica Titania materials prepared from single-source sol-gel precursor: A time-resolved SAXS study of the gelation, aging, supercritical drying and calcification processes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F05%3A00003109" target="_blank" >RIV/00216275:25310/05:00003109 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Mixed silica Titania materials prepared from single-source sol-gel precursor: A time-resolved SAXS study of the gelation, aging, supercritical drying and calcification processes

Original language description

The morphology of gels prepared from a silica/titania single-source precursor (1), obtained by reaction of 3-oxoethyl-6-trimethoxysilyl-hexan-2-one with Ti((OPr)-Pr-i)(4), was investigated by small-angle X-ray scattering (SAXS) through all stages of thepreparation process, that is, gelation, aging, drying, and calcination. The same investigations were performed for mixtures of 1 and Si(OEt)(4). Immediately after the start of the reaction small primary particles are formed, the size of which (r = 0.5 +/- 0.1 nm) remains constant through the gelationand aging process. Anomalous small-angle X-ray scattering (ASAXS) measurements strongly indicate that the primary particles are formed by hydrolysis and condensation of the titanium alkoxide moiety of 1. condensation proceeds by a slower aggregation of the primary particles. Additional Si/O from Si(OEt)(4) is incorporated between the clusters. The size of the mass fractal secondary particles formed by aggregation of the primary particles inc

Czech name

Směsi křemičitanů a titanu připravené pomocí sol-gel prekurzoru: Studium procesů gelace, stárnutí, superkritického schnutí,kalcifikace

Czech description

Morfologie gelu připravených z křemičitanů a titanu pomoci prekursoru byla studována ve všech fázích přípravy, tedy gelace, stárnutí, sušení a kalcifikace. Byly vytvořeny poměrně přesné představy o chování primárních a sekundárních částic při těchto dějích.

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CA - Inorganic chemistry

OECD FORD branch

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Project

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Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2005

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemistry Materials

ISSN

0897-4756

e-ISSN

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Volume of the periodical

17

Issue of the periodical within the volume

12

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

8

Pages from-to

3146-3153

UT code for WoS article

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EID of the result in the Scopus database

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