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Time-resolved in situ studies of the formation of cubic mesoporous silica formed with triblock copolymers

Flodström, Katarina LU ; Wennerström, Håkan LU ; Teixeira, C V; Amenitsch, H; Lindén, M and Alfredsson, Viveka LU (2004) In Langmuir 20(23). p.10311-10316
Abstract
The mechanism of formation of two different cubic mesoporous silica materials formed with Pluronic triblock copolymers is investigated with in situ time-resolved small-angle synchrotron X-ray scattering, in situ time-resolved H-1 nuclear magnetic resonance, and time-resolved transmission electron microscopy. The materials studied are the micellar cubic (Im (3) over barm) SBA-16 formed with Pluronic F108 and the bicontinuous cubic (Ia (3) over bard) silica material formed with Pluronic P103 and NaI. The formation mechanisms of the two cubic structures are shown to be dissimilar. For the Im (3) over barm material, in the early stages of the synthesis, floes of unordered micelles are observed, but areas where the micelles have started to... (More)
The mechanism of formation of two different cubic mesoporous silica materials formed with Pluronic triblock copolymers is investigated with in situ time-resolved small-angle synchrotron X-ray scattering, in situ time-resolved H-1 nuclear magnetic resonance, and time-resolved transmission electron microscopy. The materials studied are the micellar cubic (Im (3) over barm) SBA-16 formed with Pluronic F108 and the bicontinuous cubic (Ia (3) over bard) silica material formed with Pluronic P103 and NaI. The formation mechanisms of the two cubic structures are shown to be dissimilar. For the Im (3) over barm material, in the early stages of the synthesis, floes of unordered micelles are observed, but areas where the micelles have started to order are also present. With time, there is an increase in order; however, there is a coexistence of unordered micelles and ordered material all through this study. The bicontinuous cubic silica is formed via a different path. The system is phase-separated already before the addition of the silica source, which implies that a concentrated phase is present, acting as the structure director of the Ia (3) over bard structure. The results are compared with earlier reports on the formation of the hexagonal SBA-15 material. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
20
issue
23
pages
10311 - 10316
publisher
The American Chemical Society
external identifiers
  • wos:000224981600065
  • scopus:9144251731
ISSN
0743-7463
DOI
10.1021/la0482958
language
English
LU publication?
yes
id
677bd400-e8f7-411f-bffe-854941892188 (old id 153828)
date added to LUP
2007-07-11 11:34:03
date last changed
2017-08-20 03:33:00
@article{677bd400-e8f7-411f-bffe-854941892188,
  abstract     = {The mechanism of formation of two different cubic mesoporous silica materials formed with Pluronic triblock copolymers is investigated with in situ time-resolved small-angle synchrotron X-ray scattering, in situ time-resolved H-1 nuclear magnetic resonance, and time-resolved transmission electron microscopy. The materials studied are the micellar cubic (Im (3) over barm) SBA-16 formed with Pluronic F108 and the bicontinuous cubic (Ia (3) over bard) silica material formed with Pluronic P103 and NaI. The formation mechanisms of the two cubic structures are shown to be dissimilar. For the Im (3) over barm material, in the early stages of the synthesis, floes of unordered micelles are observed, but areas where the micelles have started to order are also present. With time, there is an increase in order; however, there is a coexistence of unordered micelles and ordered material all through this study. The bicontinuous cubic silica is formed via a different path. The system is phase-separated already before the addition of the silica source, which implies that a concentrated phase is present, acting as the structure director of the Ia (3) over bard structure. The results are compared with earlier reports on the formation of the hexagonal SBA-15 material.},
  author       = {Flodström, Katarina and Wennerström, Håkan and Teixeira, C V and Amenitsch, H and Lindén, M and Alfredsson, Viveka},
  issn         = {0743-7463},
  language     = {eng},
  number       = {23},
  pages        = {10311--10316},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Time-resolved in situ studies of the formation of cubic mesoporous silica formed with triblock copolymers},
  url          = {http://dx.doi.org/10.1021/la0482958},
  volume       = {20},
  year         = {2004},
}