%0 Book Section %1 statphys23_0956 %A Henseler, P. %A Nielaba, P. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K brownian colloids driven microchannel motion statphys23 topic-6 %T Transport of Colloids in Micro-Channels %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=956 %X The transport behavior of a system of gravitationally driven colloidal particles is investigated. The particle interactions are determined by the superparamagnetic behavior of the particles. They can thus be arranged in a hexagonal order by application of an external magnetic field. Therefore the motion of the particles through a narrow channel is governed by this positioning and a layered structure forms parallel to the walls. The arrangement of the particles is perturbed by diffusion and the motion induced by gravity. Due to these combined influences a density gradient forms along the direction of motion of the particles. A reconfiguration of the ordered structure is observed leading to a reduction of the number of layers. Experiments and Brownian dynamics (BD) simulations show that this is due to the density gradient along the channel. Furthermore we will present simulation results for particles in counterflow and for various channel geometries. 1) M.~Koppl, P. Henseler, A. Erbe, P. Nielaba and P. Leiderer, Phys. Rev. Lett. 97, 208302 (2006)

@incollection{statphys23_0956, abstract = {The transport behavior of a system of gravitationally driven colloidal particles is investigated. The particle interactions are determined by the superparamagnetic behavior of the particles. They can thus be arranged in a hexagonal order by application of an external magnetic field. Therefore the motion of the particles through a narrow channel is governed by this positioning and a layered structure forms parallel to the walls. The arrangement of the particles is perturbed by diffusion and the motion induced by gravity. Due to these combined influences a density gradient forms along the direction of motion of the particles. A reconfiguration of the ordered structure is observed leading to a reduction of the number of layers. Experiments and Brownian dynamics (BD) simulations show that this is due to the density gradient along the channel. Furthermore we will present simulation results for particles in counterflow and for various channel geometries. 1) M.~Koppl, P. Henseler, A. Erbe, P. Nielaba and P. Leiderer, Phys. Rev. Lett. {\bf 97}, 208302 (2006)}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Henseler, P. and Nielaba, P.}, biburl = {https://www.bibsonomy.org/bibtex/22ed760f2c1fb88ee330648e68956c314/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {1d3f6edf4d7cc8cbccc3a0268cf9ff30}, intrahash = {2ed760f2c1fb88ee330648e68956c314}, keywords = {brownian colloids driven microchannel motion statphys23 topic-6}, month = {9-13 July}, timestamp = {2007-06-20T10:16:35.000+0200}, title = {Transport of Colloids in Micro-Channels}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=956}, year = 2007 }