Advanced

Adsorption and aggregation of cationic amphiphilic polyelectrolytes on silica

Samoshina, Yulia LU ; Nylander, Tommy LU ; Claesson, P; Schillén, Karin LU ; Iliopoulos, I and Lindman, Björn LU (2005) In Langmuir 21(7). p.2855-2864
Abstract
The adsorption of two cationic amphiphilic polyelectrolytes, which are copolymers of two charged monomers, triethyl(vinylbenzyl)ammonium chloride and dimethyldodecyl(vinylbenzyl)ammonium chloride (which is the amphiphilic one) with different contents of amphiphilic groups (40% (40DT) and 80% (80DT)), onto the hydrophilic silica-aqueous solution interface has been studied by in situ null ellipsometry and tapping mode atomic force microscopy (AFM). Adsorption isotherms for both polyelectrolytes were obtained at 25 degrees C and at different ionic strengths, and the adsorption kinetics was also investigated. At low ionic strength, thin adsorbed layers were observed for both polyelectrolytes. The adsorption increases with polymer concentration... (More)
The adsorption of two cationic amphiphilic polyelectrolytes, which are copolymers of two charged monomers, triethyl(vinylbenzyl)ammonium chloride and dimethyldodecyl(vinylbenzyl)ammonium chloride (which is the amphiphilic one) with different contents of amphiphilic groups (40% (40DT) and 80% (80DT)), onto the hydrophilic silica-aqueous solution interface has been studied by in situ null ellipsometry and tapping mode atomic force microscopy (AFM). Adsorption isotherms for both polyelectrolytes were obtained at 25 degrees C and at different ionic strengths, and the adsorption kinetics was also investigated. At low ionic strength, thin adsorbed layers were observed for both polyelectrolytes. The adsorption increases with polymer concentration and reaches, in most cases, a plateau at a concentration below 50 ppm. For the 80DT polymer, at higher ionic strength, an association into aggregates occurs at concentrations at and above 50 ppm. The aggregates were observed directly by AFM at the surface, and by dynamic light scattering in the solution. The adsorption data for this case demonstrated multilayer formation, which correlates well with the increase in viscosity with the ionic strength observed for 80DT. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
21
issue
7
pages
2855 - 2864
publisher
The American Chemical Society
external identifiers
  • wos:000228042400036
  • pmid:15779958
  • scopus:16244376188
ISSN
0743-7463
DOI
10.1021/la047311y
language
English
LU publication?
yes
id
82e00d6d-7d32-4c25-86eb-73bfed0d6a45 (old id 157570)
date added to LUP
2007-07-12 11:02:25
date last changed
2017-08-27 04:16:15
@article{82e00d6d-7d32-4c25-86eb-73bfed0d6a45,
  abstract     = {The adsorption of two cationic amphiphilic polyelectrolytes, which are copolymers of two charged monomers, triethyl(vinylbenzyl)ammonium chloride and dimethyldodecyl(vinylbenzyl)ammonium chloride (which is the amphiphilic one) with different contents of amphiphilic groups (40% (40DT) and 80% (80DT)), onto the hydrophilic silica-aqueous solution interface has been studied by in situ null ellipsometry and tapping mode atomic force microscopy (AFM). Adsorption isotherms for both polyelectrolytes were obtained at 25 degrees C and at different ionic strengths, and the adsorption kinetics was also investigated. At low ionic strength, thin adsorbed layers were observed for both polyelectrolytes. The adsorption increases with polymer concentration and reaches, in most cases, a plateau at a concentration below 50 ppm. For the 80DT polymer, at higher ionic strength, an association into aggregates occurs at concentrations at and above 50 ppm. The aggregates were observed directly by AFM at the surface, and by dynamic light scattering in the solution. The adsorption data for this case demonstrated multilayer formation, which correlates well with the increase in viscosity with the ionic strength observed for 80DT.},
  author       = {Samoshina, Yulia and Nylander, Tommy and Claesson, P and Schillén, Karin and Iliopoulos, I and Lindman, Björn},
  issn         = {0743-7463},
  language     = {eng},
  number       = {7},
  pages        = {2855--2864},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Adsorption and aggregation of cationic amphiphilic polyelectrolytes on silica},
  url          = {http://dx.doi.org/10.1021/la047311y},
  volume       = {21},
  year         = {2005},
}