Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 52: Poster: Active Matter, Microswimmer, Microfluidics

DY 52.8: Poster

Thursday, April 4, 2019, 15:00–18:00, Poster B2

Measurement of the fluid-flow-field generated by an attached self-thermo-phoretic micro swimmer — •Nicola Söker and Frank Cichos — Leipzig University

We measure the 3D flow field induced by a heated metal caped polystyrene micro particle adherent to a glass surface in water. In current literature it is assumed, that thermo-phoresis can be well described by an induced slip flow proportional to the temperature gradient along a surface or phase boundary. The motion performed by a self thermo-phoretic micro-swimmers is then given by slip flows along the swimmers surface and boundary slip-flows in the environment. We look at an adherent micro-swimmer since then the flow field is long ranged. Also a freely moving swimmer would also sample different environmental conditions. The average fluid velocity field is recorded using gold nanoparticle tracers. Three dimensional motion is extracted from the defocused images of the gold nanoparticles. The flow fields are compared to numerical calculations of the flow field including all hydrodynamic boundaries.