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@ARTICLE{Brito:867755,
author = {Brito, Mariano E. and Denton, Alan R. and Nägele, Gerhard},
title = {{M}odeling deswelling, thermodynamics, structure, and
dynamics in ionic microgel suspensions},
journal = {The journal of chemical physics},
volume = {151},
number = {22},
issn = {1089-7690},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {FZJ-2019-06370},
pages = {224901 -},
year = {2019},
abstract = {Ionic microgel particles in a good solvent swell to an
equilibrium size determined by a balance of electrostatic
and elastic forces. Whencrowded, ionic microgels deswell
owing to a redistribution of microions inside and outside
the particles. The concentration-dependentdeswelling affects
the interactions between the microgels, and, consequently,
the suspension properties. We present a comprehensive
theoreticalstudy of crowding effects on thermodynamic,
structural, and dynamic properties of weakly cross-linked
ionic microgels in a good solvent.The microgels are modeled
as microion- and solvent-permeable colloidal spheres with
fixed charge uniformly distributed over the polymergel
backbone, whose elastic and solvent-interaction free
energies are described using the Flory-Rehner theory. Two
mean-field methods forcalculating the crowding-dependent
microgel radius are investigated and combined with
calculations of the net microgel charge characterizingthe
electrostatic part of an effective microgel pair potential,
with charge renormalization accounted for. Using this
effective pair potential,thermodynamic and static suspension
properties are calculated including the osmotic pressure and
microgel pair distribution function. Thelatter is used in
our calculations of dynamic suspension properties, where we
account for hydrodynamic interactions. Results for
diffusionand rheological properties are presented over
ranges of microgel concentration and charge. We show that
deswelling mildly enhances selfdiffusionand collective
diffusion and the osmotic pressure, lowers the suspension
viscosity, and significantly shifts the suspension
crystallizationpoint to higher concentrations. This paper
presents a bottom-up approach to efficiently computing
suspension properties of crowdedionic microgels using
single-particle characteristics.},
cin = {ICS-3},
ddc = {530},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551)},
pid = {G:(DE-HGF)POF3-551},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31837680},
UT = {WOS:000505596000034},
doi = {10.1063/1.5129575},
url = {https://juser.fz-juelich.de/record/867755},
}