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Forces between silica surfaces with adsorbed cationic surfactants: Influence of salt and added nonionic surfactants

Stiernstedt, J ; Froberg, J C ; Tiberg, Fredrik LU and Rutland, M W (2005) In Langmuir 21(5). p.1875-1883
Abstract
Forces have been measured between silica surfaces with adsorbed surfactants by means of a bimorph surface force apparatus. The surfactants used are the cationic surfactant tetradecyltrimethylammonium bromide (TTAB) and the nonionic surfactant hexakis(ethylene glycol) mono-n-tetradecyl ether (C14E6) as well as mixtures of these two surfactants. The measurements were made at elevated pH, and the effect of salt was studied. At high pH the glass surface is highly charged, which increases the adsorption of TTAB. Despite the low adsorption generally seen for nonionic surfactants on silica at high pH, addition Of C14E6 has a considerable effect on the surface forces between two glass surfaces in a TTAB solution. The barrier force is hardly... (More)
Forces have been measured between silica surfaces with adsorbed surfactants by means of a bimorph surface force apparatus. The surfactants used are the cationic surfactant tetradecyltrimethylammonium bromide (TTAB) and the nonionic surfactant hexakis(ethylene glycol) mono-n-tetradecyl ether (C14E6) as well as mixtures of these two surfactants. The measurements were made at elevated pH, and the effect of salt was studied. At high pH the glass surface is highly charged, which increases the adsorption of TTAB. Despite the low adsorption generally seen for nonionic surfactants on silica at high pH, addition Of C14E6 has a considerable effect on the surface forces between two glass surfaces in a TTAB solution. The barrier force is hardly affected, but the adhesion is reduced remarkably. Also, addition of salt decreases the adhesion, but increases the barrier force. In the presence of salt, addition Of C14E6 also increases the thickness of the adsorbed layer. The force barrier height is also shown to be related to literature values for surface pressure data in these systems. (Less)
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; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
21
issue
5
pages
1875 - 1883
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:14844334915
  • pmid:15723484
ISSN
0743-7463
DOI
10.1021/la047763a
language
English
LU publication?
yes
id
73a2f33a-721f-4c52-a52d-f79a6a13ed9c (old id 157631)
date added to LUP
2016-04-01 12:36:54
date last changed
2020-09-30 02:20:59
@article{73a2f33a-721f-4c52-a52d-f79a6a13ed9c,
  abstract     = {Forces have been measured between silica surfaces with adsorbed surfactants by means of a bimorph surface force apparatus. The surfactants used are the cationic surfactant tetradecyltrimethylammonium bromide (TTAB) and the nonionic surfactant hexakis(ethylene glycol) mono-n-tetradecyl ether (C14E6) as well as mixtures of these two surfactants. The measurements were made at elevated pH, and the effect of salt was studied. At high pH the glass surface is highly charged, which increases the adsorption of TTAB. Despite the low adsorption generally seen for nonionic surfactants on silica at high pH, addition Of C14E6 has a considerable effect on the surface forces between two glass surfaces in a TTAB solution. The barrier force is hardly affected, but the adhesion is reduced remarkably. Also, addition of salt decreases the adhesion, but increases the barrier force. In the presence of salt, addition Of C14E6 also increases the thickness of the adsorbed layer. The force barrier height is also shown to be related to literature values for surface pressure data in these systems.},
  author       = {Stiernstedt, J and Froberg, J C and Tiberg, Fredrik and Rutland, M W},
  issn         = {0743-7463},
  language     = {eng},
  number       = {5},
  pages        = {1875--1883},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Langmuir},
  title        = {Forces between silica surfaces with adsorbed cationic surfactants: Influence of salt and added nonionic surfactants},
  url          = {http://dx.doi.org/10.1021/la047763a},
  doi          = {10.1021/la047763a},
  volume       = {21},
  year         = {2005},
}