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Controlling particle morphology and size in the synthesis of mesoporous SBA-15 materials

Linton, Peter LU ; Wennerström, Håkan LU and Alfredsson, Viveka LU (2010) In Physical Chemistry Chemical Physics 12(15). p.3852-3858
Abstract
Plate-like particles of SBA-15 form from smaller units (primary particles) that aggregate in an oriented manner. In this report we influence this aggregation by adding salt to the ongoing synthesis, generating well-ordered hexagonal p6m structure (SBA-15), with varying particle diameters. The additions, with either NaCl or NaI, were made at a time corresponding to the onset of oriented aggregation. Both salts promote the aggregation and particles with diameters of up to 5 mm were obtained. The thickness, about 0.4 mu m, of the particles was retained, in accordance with the proposed growth mechanism. The aggregation characteristic was dependent on the salt used and the concentration of the salt. Both the cation and the anion were found to... (More)
Plate-like particles of SBA-15 form from smaller units (primary particles) that aggregate in an oriented manner. In this report we influence this aggregation by adding salt to the ongoing synthesis, generating well-ordered hexagonal p6m structure (SBA-15), with varying particle diameters. The additions, with either NaCl or NaI, were made at a time corresponding to the onset of oriented aggregation. Both salts promote the aggregation and particles with diameters of up to 5 mm were obtained. The thickness, about 0.4 mu m, of the particles was retained, in accordance with the proposed growth mechanism. The aggregation characteristic was dependent on the salt used and the concentration of the salt. Both the cation and the anion were found to influence the aggregation. Having salt present already at the start of the synthesis gave a different product. The particle formation process depends on an interplay between attractive and repulsive forces between aggregates. We interpret the observed effect of salt addition to a medium which already has a very high ionic strength (1.6 M HCl) as due to ion binding to the combined polyethylene oxide-silica brush at the particles surface. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
12
issue
15
pages
3852 - 3858
publisher
Royal Society of Chemistry
external identifiers
  • wos:000276190900023
  • scopus:77950355551
ISSN
1463-9084
DOI
10.1039/b923364d
language
English
LU publication?
yes
id
c0689d55-8819-402c-87a4-be17cfa2fcee (old id 1586931)
date added to LUP
2010-04-27 12:22:09
date last changed
2018-05-29 11:43:02
@article{c0689d55-8819-402c-87a4-be17cfa2fcee,
  abstract     = {Plate-like particles of SBA-15 form from smaller units (primary particles) that aggregate in an oriented manner. In this report we influence this aggregation by adding salt to the ongoing synthesis, generating well-ordered hexagonal p6m structure (SBA-15), with varying particle diameters. The additions, with either NaCl or NaI, were made at a time corresponding to the onset of oriented aggregation. Both salts promote the aggregation and particles with diameters of up to 5 mm were obtained. The thickness, about 0.4 mu m, of the particles was retained, in accordance with the proposed growth mechanism. The aggregation characteristic was dependent on the salt used and the concentration of the salt. Both the cation and the anion were found to influence the aggregation. Having salt present already at the start of the synthesis gave a different product. The particle formation process depends on an interplay between attractive and repulsive forces between aggregates. We interpret the observed effect of salt addition to a medium which already has a very high ionic strength (1.6 M HCl) as due to ion binding to the combined polyethylene oxide-silica brush at the particles surface.},
  author       = {Linton, Peter and Wennerström, Håkan and Alfredsson, Viveka},
  issn         = {1463-9084},
  language     = {eng},
  number       = {15},
  pages        = {3852--3858},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Controlling particle morphology and size in the synthesis of mesoporous SBA-15 materials},
  url          = {http://dx.doi.org/10.1039/b923364d},
  volume       = {12},
  year         = {2010},
}