Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 8: Active Matter DY II (joint session DY/CPP/BP)
BP 8.10: Vortrag
Montag, 12. März 2018, 18:00–18:15, BH-N 243
Active colloidal particles in evaporating liquid droplets — •Borge ten Hagen1, Maziyar Jalaal1, Hai Le The2, Christian Diddens1, Alvaro Marin1, and Detlef Lohse1,3 — 1Physics of Fluids Group and Max Planck Center Twente, University of Twente, Enschede, The Netherlands — 2MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands — 3Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany
Inspired by biological microswimmers, various types of artificial self-propelled particles have been developed and thoroughly characterized in recent years. While in most studies quiescent solvents or stationary flow fields were considered, much less is known about the behavior of synthetic microswimmers in more complicated flow environments as they often occur in biological systems under non-laboratory conditions. Here, we investigate the dynamics of self-propelling Janus particles in an evaporating droplet of hydrogen peroxide solution. The competition between the flows due to the evaporation and the active motion of the particles leads to a complex dynamical behavior. The system is analyzed using three-dimensional particle tracking measurements and numerical simulations of the nontrivial fluid flow within the evaporating droplet. It will also be discussed how the particle activity affects the coffee-ring formation in the final state of evaporation, where the orientation of the Janus particles introduces a new order parameter.