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Structure and Dynamics of Loosely Cross-Linked Ionic Microgel Dispersions in the Fluid Regime

Holmqvist, P.; Mohanty, Priti LU ; Naegele, G.; Schurtenberger, Peter LU and Heinen, M. (2012) In Physical Review Letters 109(4).
Abstract
We report a comprehensive experimental-theoretical study of the temperature-and concentration-dependent swelling behavior of weakly cross-linked PNiPAm ionic microgel particles in the deionized fluid phase. The particles swell reversibly when the dispersion is cooled from the collapsed state to lower temperatures. While the collapsed state shows no dependence on the microgel number density, the swelling at lower T is more pronounced at lower concentrations. The static pair correlations and short-time diffusion functions, and the concentration and temperature dependence of the microgel radius and effective charge, are studied using static and dynamic light scattering in combination with state-of-the-art analytical theoretical schemes based... (More)
We report a comprehensive experimental-theoretical study of the temperature-and concentration-dependent swelling behavior of weakly cross-linked PNiPAm ionic microgel particles in the deionized fluid phase. The particles swell reversibly when the dispersion is cooled from the collapsed state to lower temperatures. While the collapsed state shows no dependence on the microgel number density, the swelling at lower T is more pronounced at lower concentrations. The static pair correlations and short-time diffusion functions, and the concentration and temperature dependence of the microgel radius and effective charge, are studied using static and dynamic light scattering in combination with state-of-the-art analytical theoretical schemes based on a Yukawa-type effective pair potential and a core-shell model. We show that only such a combined, simultaneous fit of static and dynamic scattering functions allows for an unambiguous determination of the microgel radius and effective charge. (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
Physical Review Letters
volume
109
issue
4
publisher
American Physical Society
external identifiers
  • wos:000306933000012
  • scopus:84864239413
ISSN
1079-7114
DOI
10.1103/PhysRevLett.109.048302
language
English
LU publication?
yes
id
176a6fd4-942d-4bb5-bea8-6cabd7d39405 (old id 3080004)
date added to LUP
2012-09-25 08:51:59
date last changed
2017-10-01 03:03:54
@article{176a6fd4-942d-4bb5-bea8-6cabd7d39405,
  abstract     = {We report a comprehensive experimental-theoretical study of the temperature-and concentration-dependent swelling behavior of weakly cross-linked PNiPAm ionic microgel particles in the deionized fluid phase. The particles swell reversibly when the dispersion is cooled from the collapsed state to lower temperatures. While the collapsed state shows no dependence on the microgel number density, the swelling at lower T is more pronounced at lower concentrations. The static pair correlations and short-time diffusion functions, and the concentration and temperature dependence of the microgel radius and effective charge, are studied using static and dynamic light scattering in combination with state-of-the-art analytical theoretical schemes based on a Yukawa-type effective pair potential and a core-shell model. We show that only such a combined, simultaneous fit of static and dynamic scattering functions allows for an unambiguous determination of the microgel radius and effective charge.},
  articleno    = {048302},
  author       = {Holmqvist, P. and Mohanty, Priti and Naegele, G. and Schurtenberger, Peter and Heinen, M.},
  issn         = {1079-7114},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Structure and Dynamics of Loosely Cross-Linked Ionic Microgel Dispersions in the Fluid Regime},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.109.048302},
  volume       = {109},
  year         = {2012},
}