Publikationen

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, Fakultätszentrum für Nanostrukturforschung
Externe Organisation(en)
Università degli Studi di Padova, Paris-Lodron Universität Salzburg, Universität Ulm
Journal
Chemistry: A European Journal
Band
20
Seiten
17409–17419
Anzahl der Seiten
11
ISSN
0947-6539
DOI
https://doi.org/10.1002/chem.201402873
Publikationsdatum
12-2014
Peer-reviewed
Ja
ÖFOS 2012
Materialchemie, Kondensierte Materie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/hierarchically-organized-silicatitania-monoliths-prepared-under-purely-aqueous-conditions(b8da9a81-f16f-4c7a-8cf6-3d31613dc7ef).html