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Adsorption of cationic, anionic and hydrophobically modifie polyacrylamides on silica surfaces

Samoshina, Yulia LU ; Diaz, A; Becker, Y; Nylander, Tommy LU and Lindman, Björn LU (2003) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 231(1-3). p.195-205
Abstract
The adsorption of modified polyacrylamides (PAM) at the silica surface has been studied by ellipsometry. To study the influence of the type of modification of the polyacrylamide on the adsorption behaviour, we have used cationic, anionic and hydrophobically modified polyacrylamides with varying charge density and degree of hydrophobisation. The adsorbed amount and adsorbed layer thickness were obtained at a neutral pH and at a constant ionic strength (C-KCl = 0.1 M). The effect of surfactant present during the polymerisation process has also been investigated. Cationic modified polyacrylamides have been found to adsorb most strongly onto the silica surface and a large overcompensation of the surface charge has been observed in all cases.... (More)
The adsorption of modified polyacrylamides (PAM) at the silica surface has been studied by ellipsometry. To study the influence of the type of modification of the polyacrylamide on the adsorption behaviour, we have used cationic, anionic and hydrophobically modified polyacrylamides with varying charge density and degree of hydrophobisation. The adsorbed amount and adsorbed layer thickness were obtained at a neutral pH and at a constant ionic strength (C-KCl = 0.1 M). The effect of surfactant present during the polymerisation process has also been investigated. Cationic modified polyacrylamides have been found to adsorb most strongly onto the silica surface and a large overcompensation of the surface charge has been observed in all cases. For cationic modified polyacrylamides having additional hydrophobic groups the adsorbed amount decreases with density of hy

rophobic groups, and the adsorbed layer thickness is larger. Anionic modified

polyacrylamides also adsorb onto the negative silica surface, though

the adsorbed amounts are small. The presence of the surfactant Tween 80

leads to an increase in the adsorbed amount for the polymers which

adsorb weakly in the absence of the surfactant. However, for the

polymers, which have already shown a good ability to adsorb on silica,

the addition of surfactant has no significant effect on the adsorbed

amount. (C) 2003 Elsevier B.V. All rights

reserved. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
Non-ionic surfactant, Silica, Ellipsometry, Hydrophobic PAM, Anionic PAM, Adsorption, Modified polyacrylamides, Cationic PAM
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
231
issue
1-3
pages
195 - 205
publisher
Elsevier
external identifiers
  • wos:000188806000017
  • scopus:0347301710
ISSN
0927-7757
DOI
10.1016/j.colsurfa.2003.09.005
language
English
LU publication?
yes
id
62f0fd5a-0459-4aca-bcc8-6aba400a6aae (old id 122184)
date added to LUP
2007-07-12 10:56:44
date last changed
2018-10-21 04:15:07
@article{62f0fd5a-0459-4aca-bcc8-6aba400a6aae,
  abstract     = {The adsorption of modified polyacrylamides (PAM) at the silica surface has been studied by ellipsometry. To study the influence of the type of modification of the polyacrylamide on the adsorption behaviour, we have used cationic, anionic and hydrophobically modified polyacrylamides with varying charge density and degree of hydrophobisation. The adsorbed amount and adsorbed layer thickness were obtained at a neutral pH and at a constant ionic strength (C-KCl = 0.1 M). The effect of surfactant present during the polymerisation process has also been investigated. Cationic modified polyacrylamides have been found to adsorb most strongly onto the silica surface and a large overcompensation of the surface charge has been observed in all cases. For cationic modified polyacrylamides having additional hydrophobic groups the adsorbed amount decreases with density of hy<br/><br>
rophobic groups, and the adsorbed layer thickness is larger. Anionic modified<br/><br>
	polyacrylamides also adsorb onto the negative silica surface, though<br/><br>
	the adsorbed amounts are small. The presence of the surfactant Tween 80<br/><br>
	leads to an increase in the adsorbed amount for the polymers which<br/><br>
	adsorb weakly in the absence of the surfactant. However, for the<br/><br>
	polymers, which have already shown a good ability to adsorb on silica,<br/><br>
	the addition of surfactant has no significant effect on the adsorbed<br/><br>
	amount. (C) 2003 Elsevier B.V. All rights<br/><br>
	reserved.},
  author       = {Samoshina, Yulia and Diaz, A and Becker, Y and Nylander, Tommy and Lindman, Björn},
  issn         = {0927-7757},
  keyword      = {Non-ionic surfactant,Silica,Ellipsometry,Hydrophobic PAM,Anionic PAM,Adsorption,Modified polyacrylamides,Cationic PAM},
  language     = {eng},
  number       = {1-3},
  pages        = {195--205},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Adsorption of cationic, anionic and hydrophobically modifie polyacrylamides on silica surfaces},
  url          = {http://dx.doi.org/10.1016/j.colsurfa.2003.09.005},
  volume       = {231},
  year         = {2003},
}