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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2005

Kód důvěrnosti údajů

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

Název periodika

Chemistry Materials

ISSN

0897-4756

e-ISSN

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Svazek periodika

17

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

8

Strana od-do

3146-3153

Kód UT WoS článku

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EID výsledku v databázi Scopus

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