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Hierarchically Organized Silica–Titania Monoliths Prepared under Purely Aqueous Conditions

Autor(en)

Sylvia Flaig, Johanna Akbarzadeh, Paolo Dolcet, Silvia Gross, Herwig Peterlik, Nicola Hüsing

Abstrakt

Hierarchically organized silica–titania monoliths were synthesized under

purely aqueous conditions by applying a new ethylene glycol-modified

single-source precursor, such as

3-[3-{tris(2-hydroxyethoxy)silyl}propyl]acetylacetone coordinated to a

titanium center. The influence of the silicon- and titanium-containing

single-source precursor, the novel glycolated organofunctional silane,

and the addition of tetrakis(2-hydroxyethyl)orthosilicate on the

formation of the final porous network was investigated by SEM, TEM,

nitrogen sorption, and SAXS/WAXS. In situ SAXS measurements were

performed to obtain insight into the development of the mesoporous

network during sol–gel transition. IR-ATR, UV/Vis, XPS, and XAFS

measurements showed that up to a Si/Ti ratio of 35:1, well-dispersed

titanium centers in a macro-/mesoporous SiO₂ network with a specific surface area of up to 582 m² g⁻¹

were obtained. An increase in Ti content resulted in a decrease in

specific surface area and a loss of the cellular character of the

macroporous network. With a 1:1 Si/Ti ratio, silica–titania powders with

circa 100 m² g⁻¹ and anatase domains within the SiO₂ matrix were obtained.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Università degli Studi di Padova, Paris-Lodron Universität Salzburg, Universität Ulm

Journal

Chemistry: A European Journal

Band

Seiten

17409–17419

Anzahl der Seiten

ISSN

0947-6539

DOI

https://doi.org/10.1002/chem.201402873

Publikationsdatum

12-2014

Peer-reviewed

ÖFOS 2012

103015 Kondensierte Materie, 104011 Materialchemie

Schlagwörter

ASJC Scopus Sachgebiete

Catalysis, Organic Chemistry

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