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Formation mechanism of mesoporous silica formed with triblock copolymers; effect of salt addition

Alfredsson, Viveka LU ; Amenitsch, H; Kleitz, F; Linden, M; Linton, Peter LU and Teixeira, CV (2005) In Studies in Surface Science and Catalysis 158. p.97-104
Abstract
SBA-15 was synthesised with Pluronic P104 ((EO)(27)-(PO)(61)-(EO)(27))) its Structure promoter at 45 degrees C, with and without NaCl (1.0 M) added to the Synthesis Mixture. TEOS (tetraethyl orthosilicate) was used as silica source. The formation process was studied by in-situ SAXS/SAXD using synchrotron light. Addition of salt affects the micellar size, initial cell-parameter of the 2-D hexagonal phase (p6mm) as well as the kinetics of the aggregation of the polymer-silica composite. The effects caused by the salt are explained by a general ionic effect. The salt makes the aqueous Solution more polar and hence a worse solvent for the polymer. The ethylene oxide chains of the polymer will be more solvophobic. This leads to a larger... (More)
SBA-15 was synthesised with Pluronic P104 ((EO)(27)-(PO)(61)-(EO)(27))) its Structure promoter at 45 degrees C, with and without NaCl (1.0 M) added to the Synthesis Mixture. TEOS (tetraethyl orthosilicate) was used as silica source. The formation process was studied by in-situ SAXS/SAXD using synchrotron light. Addition of salt affects the micellar size, initial cell-parameter of the 2-D hexagonal phase (p6mm) as well as the kinetics of the aggregation of the polymer-silica composite. The effects caused by the salt are explained by a general ionic effect. The salt makes the aqueous Solution more polar and hence a worse solvent for the polymer. The ethylene oxide chains of the polymer will be more solvophobic. This leads to a larger aggregation number ofthe micelles as well as to a stronger interaction between them. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Studies in Surface Science and Catalysis
volume
158
pages
97 - 104
publisher
Elsevier
external identifiers
  • wos:000234827500013
  • scopus:30944462734
ISSN
0167-2991
language
English
LU publication?
yes
id
d770aa30-64db-445d-ae72-afa3f1e7a3f5 (old id 209617)
date added to LUP
2007-08-13 11:37:54
date last changed
2017-02-19 04:11:01
@article{d770aa30-64db-445d-ae72-afa3f1e7a3f5,
  abstract     = {SBA-15 was synthesised with Pluronic P104 ((EO)(27)-(PO)(61)-(EO)(27))) its Structure promoter at 45 degrees C, with and without NaCl (1.0 M) added to the Synthesis Mixture. TEOS (tetraethyl orthosilicate) was used as silica source. The formation process was studied by in-situ SAXS/SAXD using synchrotron light. Addition of salt affects the micellar size, initial cell-parameter of the 2-D hexagonal phase (p6mm) as well as the kinetics of the aggregation of the polymer-silica composite. The effects caused by the salt are explained by a general ionic effect. The salt makes the aqueous Solution more polar and hence a worse solvent for the polymer. The ethylene oxide chains of the polymer will be more solvophobic. This leads to a larger aggregation number ofthe micelles as well as to a stronger interaction between them.},
  author       = {Alfredsson, Viveka and Amenitsch, H and Kleitz, F and Linden, M and Linton, Peter and Teixeira, CV},
  issn         = {0167-2991},
  language     = {eng},
  pages        = {97--104},
  publisher    = {Elsevier},
  series       = {Studies in Surface Science and Catalysis},
  title        = {Formation mechanism of mesoporous silica formed with triblock copolymers; effect of salt addition},
  volume       = {158},
  year         = {2005},
}