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@PHDTHESIS{Heinen:17828,
key = {17828},
othercontributors = {Heinen, Marco},
title = {{C}harged colloids and proteins: {S}tructure, diffusion and
rheology; {S}eptember 2011},
volume = {32},
school = {Heinrich-Heine-Universität Düsseldorf},
type = {Dr. (Univ.)},
address = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {PreJuSER-17828},
isbn = {978-3-89336-751-1},
series = {Schriften des Forschungszentrums Jülich.
Schlüsseltechnologien / Key Technologies},
pages = {XII, 186 S.},
year = {2011},
note = {Record converted from VDB: 12.11.2012;
Heinrich-Heine-Universität Düsseldorf, Diss., 2011},
abstract = {This thesis comprises a theoretical description of the
microstructure, diffusion and rheological properties of
dispersions of charged Brownian particles. We have
developed, and thoroughly tested, various analytical
theoretical methods to calculate static and dynamic
properties, and have applied them to various experimental
systems. The common features of these analytic methods are
their high levels of accuracy, versatility, and numeric
efficiency. We have calculated a large variety of
equilibrium and short-time dynamic properties and also some
long-time properties, including static structure factors,
translational collective and self-diffusion coefficients,
hydrodynamic functions, and static and high-frequency shear
viscosities. Suspensions of synthetic silica spheres,
moderately aspheric bovine serum albumin proteins, and thin
gibbsite platelets have been examined in collaboration with
experimental groups in Jülich, Tübingen, Utrecht
(Netherlands) and Košice (Slovakia). (Dynamic) Light- and
X-ray scattering data, and shear viscosities for these
systems have been calculated for concentrations up to the
liquid-solid or liquid-liquid crystal phase transition
point, allowing for a detailed characterization of the
suspended particles. In comprehensive parameter studies, we
have validated our analytic methods of calculating
equilibrium pair-correlations and (short-time) dynamics
against numerous computer simulation results. The computer
simulations were conducted by Prof. Banchio (Uni. Córdoba,
Argentina), in the course of an extended collaboration. A
model of monodisperse, charged Brownian spheres, suspended
in a structureless fluid, and interacting via a screened
Coulomb potential, serves as the basis of our analytic
schemes. The salt content of the suspension affects the
range of electrostatic repulsion, which can cause pronounced
pair correlations in low-salinity systems at very low
colloid concentrations. An important advancement of this
thesis is the development of a new analytic integral
equation scheme, named Modified Penetrating Background
corrected Rescaled Mean Spherical Approximation, which
allows for fast and accurate calculation of static pair
correlations. The pair correlation functions computed by
this method serve as input for various analytic methods of
calculating diffusion properties, and static and
high-frequency shear viscosities of chargestabilized
suspensions. A severe complication in computing dynamic
properties arises from the necessary inclusion of
long-ranged, non-pairwise additive hydrodynamic
interactions. To this end, we provide [...]},
cin = {ICS-3},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {BioSoft: Makromolekulare Systeme und biologische
Informationsverarbeitung},
pid = {G:(DE-Juel1)FUEK505},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
url = {https://juser.fz-juelich.de/record/17828},
}