Regensburg 2016 – scientific programme

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BP: Fachverband Biologische Physik

BP 30: Microswimmers I (Joint Session with DY)

BP 30.7: Talk

Tuesday, March 8, 2016, 11:30–11:45, H47

Quantification of modular phoretic micro-swimmers — •Ran Niu, Christopher Wittenberg, Julian Weber, Denis Botin, and Thomas Palberg — Institut f. Physik, JGU Mainz, Staudingerweg 7, D-55128 Mainz, Germany

We have studied the swimming behavior of modular phoretic 2D micro-swimmers with particular focus on collective and cooperative effects[1,2]. These were exploited to proceed from isolated electrolyte releasing particles, driven by electro-osmotic flow field across a charged substrate, to multi-component complex, capable of self-generated, self-directed motion, transport and release of cargo and mutual long ranged interactions. Using optical techniques, such as microscopy and super-heterodyne laser doppler velocimetry, we accurately measured and characterized the swimmer properties and dynamics. From PH gradient measurements and particle tracking, we quantified the electric field and flow field around electrolyte releasing particle. The dependence of field strength on time and the size of electrolyte releasing particle were also determined. This provides the base for the quantitative understanding and establishing of a reliable model.

[1] T. Palberg, H. Schweinfurth,T. Koller,H. Muller,H.J. Schope, and A Reinmuller, European Physics Journal Special Topics 2013, 222:2835-2853. [2] A. Reinmuller, H.J. Schope, and T. Palberg, Langmuir 2013, 29:1738*1742.