Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 20: Active Matter B (joint session DY/CPP)

DY 20.1: Vortrag

Dienstag, 2. April 2019, 14:00–14:15, H3

Collective behavior of active colloids in confined viscoelastic fluids — •N Narinder1, Mahsa Sahebdivani1, Juan Ruben Gomez-Solano2, and Clemens Bechinger11Fachbereich Physik, Universität Konstanz, Konstanz, Germany — 2Instituto de Física, Universidad Nacional Autónoma de México, México.

The natural habitat of microorganisms is complex not only in geometrical aspects but also in the sense that it is viscoelastic [1]. The fundamental question to address is what prime role such sophisticated surroundings play. To uncover this, we experimentally study the motion of light activated Janus particles in a viscoelastic fluid inside hard wall circular confinements. Unlike a Newtonian liquid [2], we observe that particles in viscoelastic fluids [3] experience an elastic repulsion from the walls which strongly depends on their activity and the elasticity of the surrounding fluid. Furthermore, strongly confined many-particle system inside circular pores exhibits a transition from liquid-like to a well-organized crystal-like behavior upon increasing the activity of particles. A further increase in activity liquifies the system and thus a reentrant liquid-like behavior is observed.

[1] J. Elgeti, R. G. Winkler, and G. Gompper, Rep. Prog. Phys. 78, 056601 (2015).

[2] G. Volpe, I. Buttinoni, D. Vogt, H. Kümmerer and C. Bechinger, Soft Matter 7, 8810 (2011).

[3] N. Narinder, C. Bechinger, and J. R. Gomez-Solano, Phys. Rev. Lett. 121, 078003 (2018).

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