Transient Colloidal Stability Controls the Particle Formation of SBA-15.
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2967545
- author
- Ruan, Juanfang LU ; Kjellman, Tomas LU ; Sakamoto, Yasuhiro and Alfredsson, Viveka LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 28
- issue
- 31
- pages
- 11567 - 11574
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000307159300033
- pmid:22758927
- scopus:84864691690
- pmid:22758927
- 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
- 2016-04-01 10:04:01
- date last changed
- 2022-04-19 22:17:08
@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 (ACS)}}, series = {{Langmuir}}, title = {{Transient Colloidal Stability Controls the Particle Formation of SBA-15.}}, url = {{http://dx.doi.org/10.1021/la3013969}}, doi = {{10.1021/la3013969}}, volume = {{28}}, year = {{2012}}, }