Details
| Original language | English |
|---|---|
| Title of host publication | Silicon Chemistry |
| Subtitle of host publication | From the Atom to Extended Systems |
| Publisher | Wiley-Blackwell |
| Pages | 460-474 |
| Number of pages | 15 |
| ISBN (electronic) | 9783527610761 |
| ISBN (print) | 9783527306473 |
| Publication status | Published - 26 Sept 2003 |
Abstract
This work reports detailed investigations on the "one-pot" approach to the synthesis of organically functionalized mesostructures. As expected, the chemistry of surfactant-silica systems is further complicated by the addition of a trialkoxysilane, and it appears that the formation of mixed silica- organosiloxane mesostructures is difficult at elevated temperatures under hydrothermal conditions in basic media. Room temperature reactions show a higher degree of incorporation of the organosiloxane, but the pore systems of the materials are not stable towards extraction. Therefore, in general, the assembly of organically modified mesostructures from acidic solutions appears preferable. It is possible that mixed silica-organosiloxane mesostructures, which are actually formed at room temperature under basic conditions upon hydrolysis of the precursor molecules, segregate at higher synthesis temperatures due to the hydrolysis-recondensation of siloxane bridges. The latter process is hindered in acidic solutions.
Keywords
- Degree of incorporation, Extended networks, Influence of phenyltrimethoxysilane, Modification, Molecular building blocks, Ordered mesostructured materials, Si-O systems, Silica mesostructures, Silicon chemistry, Synthesis
ASJC Scopus subject areas
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Silicon Chemistry: From the Atom to Extended Systems. Wiley-Blackwell, 2003. p. 460-474.
Research output: Chapter in book/report/conference proceeding › Contribution to book/anthology › Research › peer review
}
TY - CHAP
T1 - Modification of ordered mesostructured materials during synthesis
AU - Altmair, Stephan
AU - Behrens, Peter
PY - 2003/9/26
Y1 - 2003/9/26
N2 - This work reports detailed investigations on the "one-pot" approach to the synthesis of organically functionalized mesostructures. As expected, the chemistry of surfactant-silica systems is further complicated by the addition of a trialkoxysilane, and it appears that the formation of mixed silica- organosiloxane mesostructures is difficult at elevated temperatures under hydrothermal conditions in basic media. Room temperature reactions show a higher degree of incorporation of the organosiloxane, but the pore systems of the materials are not stable towards extraction. Therefore, in general, the assembly of organically modified mesostructures from acidic solutions appears preferable. It is possible that mixed silica-organosiloxane mesostructures, which are actually formed at room temperature under basic conditions upon hydrolysis of the precursor molecules, segregate at higher synthesis temperatures due to the hydrolysis-recondensation of siloxane bridges. The latter process is hindered in acidic solutions.
AB - This work reports detailed investigations on the "one-pot" approach to the synthesis of organically functionalized mesostructures. As expected, the chemistry of surfactant-silica systems is further complicated by the addition of a trialkoxysilane, and it appears that the formation of mixed silica- organosiloxane mesostructures is difficult at elevated temperatures under hydrothermal conditions in basic media. Room temperature reactions show a higher degree of incorporation of the organosiloxane, but the pore systems of the materials are not stable towards extraction. Therefore, in general, the assembly of organically modified mesostructures from acidic solutions appears preferable. It is possible that mixed silica-organosiloxane mesostructures, which are actually formed at room temperature under basic conditions upon hydrolysis of the precursor molecules, segregate at higher synthesis temperatures due to the hydrolysis-recondensation of siloxane bridges. The latter process is hindered in acidic solutions.
KW - Degree of incorporation
KW - Extended networks
KW - Influence of phenyltrimethoxysilane
KW - Modification
KW - Molecular building blocks
KW - Ordered mesostructured materials
KW - Si-O systems
KW - Silica mesostructures
KW - Silicon chemistry
KW - Synthesis
UR - http://www.scopus.com/inward/record.url?scp=84955671185&partnerID=8YFLogxK
U2 - 10.1002/9783527610761.ch36
DO - 10.1002/9783527610761.ch36
M3 - Contribution to book/anthology
AN - SCOPUS:84955671185
SN - 9783527306473
SP - 460
EP - 474
BT - Silicon Chemistry
PB - Wiley-Blackwell
ER -