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Effects of Counterions and Co-ions on Foam Films Stabilized by Anionic Dodecyl Sulfate.

Schelero, Natascha; Hedicke, Gabi; Linse, Per LU and Klitzing, Regine V (2010) In The Journal of Physical Chemistry Part B 114(47). p.15523-15529
Abstract
The influence of counterions and co-ions on the stability and thickness of foam films stabilized by anionic dodecyl sulfate (DS(-)) has been studied in a thin film pressure balance. Particularly, the effect on the properties of foam films of (i) the counterions Li(+), Na(+), and Cs(+) of DS(-) and (ii) monovalent inorganic salts added to sodium dodecyl sulfate solutions is considered. Generally, addition of salt improved the stability of the foam films. As a second order, an increasing ionic size led to an increased adsorption, which in the case of cations gave thinner and less stable films and in the case of anions led to thicker and more stable films. Hence, an effect of anions was observed though the film surfaces were already... (More)
The influence of counterions and co-ions on the stability and thickness of foam films stabilized by anionic dodecyl sulfate (DS(-)) has been studied in a thin film pressure balance. Particularly, the effect on the properties of foam films of (i) the counterions Li(+), Na(+), and Cs(+) of DS(-) and (ii) monovalent inorganic salts added to sodium dodecyl sulfate solutions is considered. Generally, addition of salt improved the stability of the foam films. As a second order, an increasing ionic size led to an increased adsorption, which in the case of cations gave thinner and less stable films and in the case of anions led to thicker and more stable films. Hence, an effect of anions was observed though the film surfaces were already negatively charged by the anionic DS(-), leading to the conclusion that adsorption of anions to the film surface is governed by ion specific rather than electrostatic interactions. At a fixed surfactant and varying salt concentration, a maximum in film thickness could be identified at a salt concentration well below the surfactant concentration. We anticipate that (i) at low salt concentration salt mainly affects the charging of a film interface, whereas (ii) at high salt concentration salt mainly affects the screening of the electrostatic repulsion between the two interfaces of the film. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
114
issue
47
pages
15523 - 15529
publisher
The American Chemical Society
external identifiers
  • wos:000284454500012
  • pmid:21058691
  • scopus:78649497319
ISSN
1520-5207
DOI
10.1021/jp1070488
language
English
LU publication?
yes
id
ae774a3b-ba2c-4067-88fd-792683cc784b (old id 1732197)
date added to LUP
2010-12-15 12:48:15
date last changed
2018-07-15 03:59:45
@article{ae774a3b-ba2c-4067-88fd-792683cc784b,
  abstract     = {The influence of counterions and co-ions on the stability and thickness of foam films stabilized by anionic dodecyl sulfate (DS(-)) has been studied in a thin film pressure balance. Particularly, the effect on the properties of foam films of (i) the counterions Li(+), Na(+), and Cs(+) of DS(-) and (ii) monovalent inorganic salts added to sodium dodecyl sulfate solutions is considered. Generally, addition of salt improved the stability of the foam films. As a second order, an increasing ionic size led to an increased adsorption, which in the case of cations gave thinner and less stable films and in the case of anions led to thicker and more stable films. Hence, an effect of anions was observed though the film surfaces were already negatively charged by the anionic DS(-), leading to the conclusion that adsorption of anions to the film surface is governed by ion specific rather than electrostatic interactions. At a fixed surfactant and varying salt concentration, a maximum in film thickness could be identified at a salt concentration well below the surfactant concentration. We anticipate that (i) at low salt concentration salt mainly affects the charging of a film interface, whereas (ii) at high salt concentration salt mainly affects the screening of the electrostatic repulsion between the two interfaces of the film.},
  author       = {Schelero, Natascha and Hedicke, Gabi and Linse, Per and Klitzing, Regine V},
  issn         = {1520-5207},
  language     = {eng},
  number       = {47},
  pages        = {15523--15529},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Effects of Counterions and Co-ions on Foam Films Stabilized by Anionic Dodecyl Sulfate.},
  url          = {http://dx.doi.org/10.1021/jp1070488},
  volume       = {114},
  year         = {2010},
}