Hierarchically organized silica monoliths

Autor(en)

Sylvia Flaig, Johanna Akbarzadeh, Herwig Peterlik, Nicola Huesing

Abstrakt

The influence of different acids, such as hydrochloric acid, sulfuric acid, nitric acid, hydrobromic acid and acetic acid on the polymerization-induced phase separation process in the formation of hierarchically organized silica monoliths was investigated in detail. Special emphasis is given to systems synthesized from tetrakis(2-hydroxyethoxy)silane (EGMS) or tetramethoxysilane (TMOS) as the silica source in the presence of Pluronic(A (R)) P123 serving as structure-directing agent. The obtained silica monoliths exhibited a co-continuous and cellular macroporous structure comprising 2D hexagonally arranged mesopores with high specific surface areas ranging from 320-787 m(2) g(-1) independent of the applied silane precursor and regardless whether hydrochloric acid or sulfuric acid was used. A drastic change in macropore morphology to closed pores or particulate structures was observed for nitric, bromic as well as acetic acid. For sulfuric and nitric acid, the influence on the mesostructure was not as pronounced and 2D hexagonally arranged mesopores were obtained. With bromic and acetic acid a loss in mesopore ordering has been observed. Best developed hierarchically organized networks with respect to a co-continuous, cellular macroporous network, specific surface area and 2D hexagonally arranged mesopores were obtained for EGMS as well as for TMOS with P123 in sulfuric acid.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Paris-Lodron Universität Salzburg

Journal

Journal of Sol-Gel Science and Technology

Band

73

Seiten

103-111

Anzahl der Seiten

9

ISSN

0928-0707

DOI

https://doi.org/10.1007/s10971-014-3500-8

Publikationsdatum

01-2015

Peer-reviewed

Ja

ÖFOS 2012

103020 Oberflächenphysik, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Ceramics and Composites, Materials Chemistry, Chemistry(all), Biomaterials

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/hierarchically-organized-silica-monoliths(7073d095-08a9-4dce-b579-023d02682c32).html