Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 20: SYMPOSIUM Microfluidics I: Boundary conditions, manipulation, and transport

CPP 20.6: Talk

Thursday, March 30, 2006, 11:30–11:45, ZEU 160

Modeling particle motion in structured microfluidic devices — •Ralf Eichhorn and Peter Reimann — Universität Bielefeld, Fakultät für Physik, D-33615 Bielefeld

The motion of a colloidal particle in a structured microfluidic system under the influence of externally applied electric fields is modelled, including electroosmotic and electrophoretic effects as well as thermal fluctuations. The theory is applied to a microfluidic lab-on-a-chip known to exhibit absolute negative mobility [1] (i.e. net motion opposite to the net acting force) and predicts that two different species of like-charged particles may simultaneously migrate into opposite directions for suitable electric driving fields.

[1] A. Ros, R. Eichhorn, J. Regtmeier, T. Duong, P. Reimann, D. Anselmetti, Nature 436 , 928 (2005)