Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Colloids and Complex Fluids
CPP 12.3: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
Interactions of self-propelled micro-swimmers in viscoelastic fluids. — •Mahsa Sahebdivani1, Juan Ruben Gomez-Solano1, and Clemens Bechinger1,2 — 12. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Max-Planck-Institut fuer Intelligente Systeme, Heisenbergstrasse 3, 70569 Stuttgart, Germany
The motion of many natural micro-swimmers, such as bacteria and spermatozoa, commonly takes place in viscoelastic fluids and in complex crowded environments. Contrary to the extensive studies on the motion of artificial micro-swimmers in Newtonian fluids [1], only in a few experimental works, the swimming mechanism of some microorganisms e.g. algal cells [2], and E. coli [3] has been done. In our work, we experimentally investigate the motion of spherical Janus particles in viscoelastic fluids with very large relaxation times. In particular, we focus on the behavior of these active particles in presence of walls and obstacles, where very long-range interactions are mediated by the transient flow fields induced by the active motion of the micro-swimmers [4]. We also study inter-particle interactions between micro-swimmers, where the viscoelasticity of the surrounding fluid gives rise to dramatic differences in their collective behavior compared to the motion in Newtonian fluids.
[1] I. Buttinoni, et al., J. Phys.: Cond. Mat. 24, 284129 (2012) [2] B. Qin, et al., Sci. Rep. 5:9190 (2015) [3] A. E. Patteson, et al., Sci. Rep. 5:15761 (2015) [4] Gomez-Solano. , Bechinger, New J. Phys. 17(2015)103032