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@ARTICLE{Riest:188112,
author = {Riest, Jonas and Eckert, Thomas and Richtering, Walter and
Naegele, Gerhard},
title = {{D}ynamics of suspensions of hydrodynamically structured
particles: analytic theory and applications to experiments},
journal = {Soft matter},
volume = {11},
number = {14},
issn = {1744-6848},
address = {London},
publisher = {Royal Soc. of Chemistry},
reportid = {FZJ-2015-01579},
pages = {2821-2843},
year = {2015},
abstract = {We present an easy-to-use analytic toolbox for the
calculation of short-time transport properties of
concentrated suspensions of spherical colloidal particles
with internal hydrodynamic structure, and direct
interactions described by a hard-core or soft Hertz pair
potential. The considered dynamic properties include
self-diffusion and sedimentation coefficients, the
wavenumber-dependent diffusion function determined in
dynamic scattering experiments, and the high-frequency shear
viscosity. The toolbox is based on the hydrodynamic radius
model (HRM) wherein the internal particle structure is
mapped on a hydrodynamic radius parameter for unchanged
direct interactions, and on an existing simulation data base
for solvent-permeable and spherical annulus particles.
Useful scaling relations for the diffusion function and
self-diffusion coefficient, known to be valid for hard-core
interaction, are shown to apply also for soft pair
potentials. We further discuss extensions of the toolbox to
long-time transport properties including the low-shear
zero-frequency viscosity and the long-time self-diffusion
coefficient. The versatility of the toolbox is demonstrated
by the analysis of a previous light scattering study of
suspensions of non-ionic PNiPAM microgels [Eckert et al., J.
Chem. Phys., 2008, 129, 124902] in which a detailed
theoretical analysis of the dynamic data was left as an open
task. By the comparison with Hertz potential based
calculations, we show that the experimental data are
consistently and accurately described using the
Verlet–Weis corrected Percus–Yevick structure factor as
input, and for a solvent penetration length equal to three
percent of the excluded volume radius. This small amount of
solvent permeability of the microgel particles has a
significant dynamic effect at larger concentrations.},
cin = {ICS-3},
ddc = {530},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551) /
SFB 985 B06 - Kontinuierliche Trennung und Aufkonzentrierung
von Mikrogelen (B06) (221475706)},
pid = {G:(DE-HGF)POF3-551 / G:(GEPRIS)221475706},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000351711800013},
pubmed = {pmid:25707362},
doi = {10.1039/C4SM02816C},
url = {https://juser.fz-juelich.de/record/188112},
}