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Cationic Poly(N-isopropylacrylamide) Block Copolymer Adsorption Investigated by Dual Polarization Interferometry and Lattice Mean-Field Theory

Shovsky, Alexander; Knohl, Stefan; Dedinaite, Andra; Zhu, Kaizheng; Kjoniksen, Anna-Lena; Nystrom, Bo; Linse, Per LU and Claesson, Per M. (2012) In Langmuir 28(39). p.14028-14038
Abstract
A series of cationic diblock copolymers, poly(N-isopropylacrylamide)(48)-block-poly((3-acrylamidopropyl)trimethylammonium chloride)(x), abbreviated as PNIPAAM(48)-b-PAMPTMA(X)(+) (X = 0, 6, 10, 14, and 20), has been synthesized, and their adsorption onto silicon oxynitride from aqueous solution has been investigated using dual polarization interferometry. The polymer adsorption was modeled by using a lattice mean-field theory, and a satisfactory consistency between theory and experiments was found in terms of surface excess and layer thickness. Both theory and experiments show that the adsorption is limited by steric repulsion for X < X-max and by electrostatic interactions for X > X-max Modeling demonstrates that significant surface... (More)
A series of cationic diblock copolymers, poly(N-isopropylacrylamide)(48)-block-poly((3-acrylamidopropyl)trimethylammonium chloride)(x), abbreviated as PNIPAAM(48)-b-PAMPTMA(X)(+) (X = 0, 6, 10, 14, and 20), has been synthesized, and their adsorption onto silicon oxynitride from aqueous solution has been investigated using dual polarization interferometry. The polymer adsorption was modeled by using a lattice mean-field theory, and a satisfactory consistency between theory and experiments was found in terms of surface excess and layer thickness. Both theory and experiments show that the adsorption is limited by steric repulsion for X < X-max and by electrostatic interactions for X > X-max Modeling demonstrates that significant surface charge regulation occurs due to adsorption. Both the nonionic and cationic block exhibit nonelectrostatic affinity to silicon oxynitride and thus contribute to the driving force for adsorption, and modeling is used for clarifying how changes in the nonelectrostatic affinity affects the surface excess. The segments of the nonionic and cationic blocks seem less segregated when both have a nonelectrostatic affinity for the surface compared to the case where the segments had no surface affinity. Adsorption kinetics was investigated experimentally. Two kinetic regimes were observed: the adsorption rate is initially controlled by the mass transfer rate to the surface and at higher coverage is limited by the attachment rate. (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
28
issue
39
pages
14028 - 14038
publisher
The American Chemical Society
external identifiers
  • wos:000309431100034
  • scopus:84867035483
ISSN
0743-7463
DOI
10.1021/la302154p
language
English
LU publication?
yes
id
b40b932b-4609-43a5-a72f-f343ce4adf7e (old id 3187410)
date added to LUP
2012-12-06 13:41:57
date last changed
2017-07-09 03:05:28
@article{b40b932b-4609-43a5-a72f-f343ce4adf7e,
  abstract     = {A series of cationic diblock copolymers, poly(N-isopropylacrylamide)(48)-block-poly((3-acrylamidopropyl)trimethylammonium chloride)(x), abbreviated as PNIPAAM(48)-b-PAMPTMA(X)(+) (X = 0, 6, 10, 14, and 20), has been synthesized, and their adsorption onto silicon oxynitride from aqueous solution has been investigated using dual polarization interferometry. The polymer adsorption was modeled by using a lattice mean-field theory, and a satisfactory consistency between theory and experiments was found in terms of surface excess and layer thickness. Both theory and experiments show that the adsorption is limited by steric repulsion for X &lt; X-max and by electrostatic interactions for X &gt; X-max Modeling demonstrates that significant surface charge regulation occurs due to adsorption. Both the nonionic and cationic block exhibit nonelectrostatic affinity to silicon oxynitride and thus contribute to the driving force for adsorption, and modeling is used for clarifying how changes in the nonelectrostatic affinity affects the surface excess. The segments of the nonionic and cationic blocks seem less segregated when both have a nonelectrostatic affinity for the surface compared to the case where the segments had no surface affinity. Adsorption kinetics was investigated experimentally. Two kinetic regimes were observed: the adsorption rate is initially controlled by the mass transfer rate to the surface and at higher coverage is limited by the attachment rate.},
  author       = {Shovsky, Alexander and Knohl, Stefan and Dedinaite, Andra and Zhu, Kaizheng and Kjoniksen, Anna-Lena and Nystrom, Bo and Linse, Per and Claesson, Per M.},
  issn         = {0743-7463},
  language     = {eng},
  number       = {39},
  pages        = {14028--14038},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Cationic Poly(N-isopropylacrylamide) Block Copolymer Adsorption Investigated by Dual Polarization Interferometry and Lattice Mean-Field Theory},
  url          = {http://dx.doi.org/10.1021/la302154p},
  volume       = {28},
  year         = {2012},
}