Die u:cris Detailansicht:
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
- 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
- 103015 Kondensierte Materie, 104011 Materialchemie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Catalysis, Organic Chemistry
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/b8da9a81-f16f-4c7a-8cf6-3d31613dc7ef