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BP: Fachverband Biologische Physik

BP 24: Active Matter IV (joint session DY/BP/CPP)

BP 24.9: Talk

Wednesday, March 18, 2020, 12:15–12:30, ZEU 160

Self-propelled thermophoretic colloidal swimmers — •Sergi Roca-Bonet and Marisol Ripoll — Theoretical Soft Matter and Biophysics, Institute of Complex Physics, Forschungszentrum Jülich, Germany

Self-propelled phoretic colloids have recently emerged as a promising avenue for the design of artificial microswimmers. We employ a hydrodynamic fluctuating mesoscale simulation approach to study both single and collective swimming. We investigate self-propelled colloidal multimers in which one monomer can eventually get higher temperature, and it is linked with one or more other monomers which induce the multimer motion. Single colloid swimming properties are varied by changing the number of the constituting monomers (here two or three), their spatial arrangement (rod-like or v-like) and the relative sizes of such monomers. We have investigated the effect of slid confinement in comparison to the 3d-bulk motion of these dimeric and trimeric colloids. The collective system properties are determined by the competition between hydrodynamic and phoretic interactions which vary as a function of the density, the colloid geometry, and the monomers phoretic affinity (philic or phobic). Examples of the resulting behaviour are clustering, swarming, or rotational motions.