KOPS - Das Institutionelle Repositorium der Universität Konstanz

Effects of confinement and external fields on structure and transport in colloidal dispersions in reduced dimensionality

Effects of confinement and external fields on structure and transport in colloidal dispersions in reduced dimensionality

Zitieren

Dateien zu dieser Ressource

Prüfsumme: MD5:2e48b7bd252b6195197cc0118a711825

WILMS, Dorothea, Sven DEUTSCHLÄNDER, Ullrich SIEMS, Kerstin FRANZRAHE, Peter HENSELER, Peter KEIM, Nadine SCHWIERZ, Peter VIRNAU, Kurt BINDER, Georg MARET, Peter NIELABA, 2012. Effects of confinement and external fields on structure and transport in colloidal dispersions in reduced dimensionality. In: Journal of Physics : Condensed Matter. 24(46), pp. 464119. ISSN 0953-8984. eISSN 1361-648X

@article{Wilms2012-11-21Effec-21099, title={Effects of confinement and external fields on structure and transport in colloidal dispersions in reduced dimensionality}, year={2012}, doi={10.1088/0953-8984/24/46/464119}, number={46}, volume={24}, issn={0953-8984}, journal={Journal of Physics : Condensed Matter}, author={Wilms, Dorothea and Deutschländer, Sven and Siems, Ullrich and Franzrahe, Kerstin and Henseler, Peter and Keim, Peter and Schwierz, Nadine and Virnau, Peter and Binder, Kurt and Maret, Georg and Nielaba, Peter}, note={Article Number: 464119} }

Nielaba, Peter Maret, Georg 2013-01-09T09:32:44Z Virnau, Peter 2013-01-09T09:32:44Z Nielaba, Peter Binder, Kurt 2012-11-21 Deutschländer, Sven Binder, Kurt Franzrahe, Kerstin Wilms, Dorothea Virnau, Peter Keim, Peter Deutschländer, Sven In this work, we focus on low-dimensional colloidal model systems, via simulation studies and also some complementary experiments, in order to elucidate the interplay between phase behavior, geometric structures and transport properties. In particular, we try to investigate the (nonlinear!) response of these very soft colloidal systems to various perturbations: uniform and uniaxial pressure, laser fields, shear due to moving boundaries and randomly quenched disorder.<br />We study ordering phenomena on surfaces or in monolayers by Monte Carlo computer simulations of binary hard-disk mixtures, the influence of a substrate being modeled by an external potential. Weak external fields allow a controlled tuning of the miscibility of the mixture. We discuss the laser induced de-mixing for the three different possible couplings to the external potential.<br />The structural behavior of hard spheres interacting with repulsive screened Coulomb or dipolar interaction in 2D and 3D narrow constrictions is investigated using Brownian dynamics simulations. Due to misfits between multiples of the lattice parameter and the channel widths, a variety of ordered and disordered lattice structures have been observed. The resulting local lattice structures and defect probabilities are studied for various cross sections. The influence of a self-organized order within the system is reflected in the velocity of the particles and their diffusive behavior.<br />Additionally, in an experimental system of dipolar colloidal particles confined by gravity on a solid substrate we investigate the effect of pinning on the dynamics of a two-dimensional colloidal liquid.<br />This work contains sections reviewing previous work by the authors as well as new, unpublished results. Among the latter are detailed studies of the phase boundaries of the de-mixing regime in binary systems in external light fields, configurations for shear induced effects at structured walls, studies on the effect of confinement on the structures and defect densities in three-dimensional systems, the effect of confinement and barriers on two-dimensional flow and diffusion, and the effect of pinning sites on the diffusion. Franzrahe, Kerstin Siems, Ullrich Keim, Peter Wilms, Dorothea Siems, Ullrich Journal of Physics : Condensed Matter ; 24 (2012), 46. - 464119 Schwierz, Nadine Henseler, Peter Henseler, Peter eng Schwierz, Nadine deposit-license Effects of confinement and external fields on structure and transport in colloidal dispersions in reduced dimensionality Maret, Georg

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

Wilms_210995.pdf 103

Das Dokument erscheint in:

KOPS Suche


Stöbern

Mein Benutzerkonto