Advanced

Triblock copolymers as templates in mesoporous silica formation : Structural dependence on polymer chain length and synthesis temperature

Kipkemboi, Pius ; Fogden, Andrew LU ; Alfredsson, Viveka LU and Flodström, Katarina LU (2001) In Langmuir 17(17). p.5398-5402
Abstract

Mesoporous silica can be formed with amphiphilic molecules acting as structure-directing templates in dilute systems. The templating properties of five related triblock copolymers, (EO)x-(PO)y-(EO)x (Pluronic L101, P103, P104, P105, and F108), have been investigated regarding the length of the EO blocks as well as the temperature of the synthesis. It was found that the number of EO units is essential in determining which silica mesophase is obtained. Lamellar structure is obtained with short EO chains (4 units); hexagonal structure, with medium length EO chains (17-37 units); and cubic structure, with long EO chains (132 units). The hydrophobicity of the (EO)x-(PO)y-(EO)x... (More)

Mesoporous silica can be formed with amphiphilic molecules acting as structure-directing templates in dilute systems. The templating properties of five related triblock copolymers, (EO)x-(PO)y-(EO)x (Pluronic L101, P103, P104, P105, and F108), have been investigated regarding the length of the EO blocks as well as the temperature of the synthesis. It was found that the number of EO units is essential in determining which silica mesophase is obtained. Lamellar structure is obtained with short EO chains (4 units); hexagonal structure, with medium length EO chains (17-37 units); and cubic structure, with long EO chains (132 units). The hydrophobicity of the (EO)x-(PO)y-(EO)x polymer is strongly affected by the temperature. This is to some extent reflected in the silica mesostructure formed; a multilamellar vesicle morphology can be obtained at elevated synthesis temperatures. Also, the temperature has an influence on particle size.

(Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
17
issue
17
pages
5 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:0035928939
ISSN
0743-7463
DOI
10.1021/la001715i
language
English
LU publication?
yes
id
18a480b0-614a-4567-9547-be2f0c315ba1
date added to LUP
2019-05-29 08:52:58
date last changed
2020-10-07 06:31:23
@article{18a480b0-614a-4567-9547-be2f0c315ba1,
  abstract     = {<p>Mesoporous silica can be formed with amphiphilic molecules acting as structure-directing templates in dilute systems. The templating properties of five related triblock copolymers, (EO)<sub>x</sub>-(PO)<sub>y</sub>-(EO)<sub>x</sub> (Pluronic L101, P103, P104, P105, and F108), have been investigated regarding the length of the EO blocks as well as the temperature of the synthesis. It was found that the number of EO units is essential in determining which silica mesophase is obtained. Lamellar structure is obtained with short EO chains (4 units); hexagonal structure, with medium length EO chains (17-37 units); and cubic structure, with long EO chains (132 units). The hydrophobicity of the (EO)<sub>x</sub>-(PO)<sub>y</sub>-(EO)<sub>x</sub> polymer is strongly affected by the temperature. This is to some extent reflected in the silica mesostructure formed; a multilamellar vesicle morphology can be obtained at elevated synthesis temperatures. Also, the temperature has an influence on particle size.</p>},
  author       = {Kipkemboi, Pius and Fogden, Andrew and Alfredsson, Viveka and Flodström, Katarina},
  issn         = {0743-7463},
  language     = {eng},
  month        = {08},
  number       = {17},
  pages        = {5398--5402},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Langmuir},
  title        = {Triblock copolymers as templates in mesoporous silica formation : Structural dependence on polymer chain length and synthesis temperature},
  url          = {http://dx.doi.org/10.1021/la001715i},
  doi          = {10.1021/la001715i},
  volume       = {17},
  year         = {2001},
}