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Transient Colloidal Stability Controls the Particle Formation of SBA-15.

Ruan, Juanfang LU ; Kjellman, Tomas LU ; Sakamoto, Yasuhiro and Alfredsson, Viveka LU (2012) In Langmuir 28(31). p.11567-11574
Abstract
A hypothesis about (transient) colloidal stability as a controlling mechanism for particle formation in SBA-15 is presented. The hypothesis is based on results from both in situ and ex situ investigations, including cryogenic transmission electron microscopy (cryo-TEM), UV-vis spectroscopy, and dynamic light scattering (DLS). Cryo-TEM images show that particles grow via the formation of silica-Pluronic-water "flocs", which coalesce in a seemingly arbitrary manner. Despite this, the final material consists of well-defined particles with a small size distribution. We argue that the interface between the flocs and surrounding media is covered by Pluronic molecules, which provide steric stabilization. As the flocs grow, the coverage of... (More)
A hypothesis about (transient) colloidal stability as a controlling mechanism for particle formation in SBA-15 is presented. The hypothesis is based on results from both in situ and ex situ investigations, including cryogenic transmission electron microscopy (cryo-TEM), UV-vis spectroscopy, and dynamic light scattering (DLS). Cryo-TEM images show that particles grow via the formation of silica-Pluronic-water "flocs", which coalesce in a seemingly arbitrary manner. Despite this, the final material consists of well-defined particles with a small size distribution. We argue that the interface between the flocs and surrounding media is covered by Pluronic molecules, which provide steric stabilization. As the flocs grow, the coverage of polymers at the interface is increased until a stable size is reached, and that regulates the particle size. By targeting the characteristics of the Pluronic molecules, during the on-going synthesis, the hypothesis is tested. The results are consistent with the concept of (transient) colloidal stability. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
28
issue
31
pages
11567 - 11574
publisher
The American Chemical Society
external identifiers
  • wos:000307159300033
  • pmid:22758927
  • scopus:84864691690
ISSN
0743-7463
DOI
10.1021/la3013969
language
English
LU publication?
yes
id
0d8abf26-63d3-41c0-9638-aecadbc2e2e6 (old id 2967545)
date added to LUP
2012-09-10 11:08:06
date last changed
2017-11-12 03:03:14
@article{0d8abf26-63d3-41c0-9638-aecadbc2e2e6,
  abstract     = {A hypothesis about (transient) colloidal stability as a controlling mechanism for particle formation in SBA-15 is presented. The hypothesis is based on results from both in situ and ex situ investigations, including cryogenic transmission electron microscopy (cryo-TEM), UV-vis spectroscopy, and dynamic light scattering (DLS). Cryo-TEM images show that particles grow via the formation of silica-Pluronic-water "flocs", which coalesce in a seemingly arbitrary manner. Despite this, the final material consists of well-defined particles with a small size distribution. We argue that the interface between the flocs and surrounding media is covered by Pluronic molecules, which provide steric stabilization. As the flocs grow, the coverage of polymers at the interface is increased until a stable size is reached, and that regulates the particle size. By targeting the characteristics of the Pluronic molecules, during the on-going synthesis, the hypothesis is tested. The results are consistent with the concept of (transient) colloidal stability.},
  author       = {Ruan, Juanfang and Kjellman, Tomas and Sakamoto, Yasuhiro and Alfredsson, Viveka},
  issn         = {0743-7463},
  language     = {eng},
  number       = {31},
  pages        = {11567--11574},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Transient Colloidal Stability Controls the Particle Formation of SBA-15.},
  url          = {http://dx.doi.org/10.1021/la3013969},
  volume       = {28},
  year         = {2012},
}