Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.46: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Non–additive resistance for the flow of colloids over two barriers — •Urs Zimmermann, Marco Heinen, and Hartmut Löwen — Institut für Theoretische Physik II, Universität Düsseldorf, Universitätsstr. 1, 40225 Düssedorf, Germany

Ohm’s law is one of the most central transport rules stating that the total resistance of sequential single resistances is additive. Using dynamical density functional theory we test additivity of sequential resistances on the scale of individual flowing particles by studying the transport of strongly interacting colloids over two barriers. If the barrier separation is getting comparable to the particle correlation length, the total resistance can be significantly larger or even smaller than the sum of the two individual resistances, depending on the barrier separation and the interaction strength between the particles. This allows to control and tune the total resistance with important applications in microfluidics.