Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Active Matter II (joint session DY/BP/CPP, organized by DY)

CPP 54.2: Vortrag

Donnerstag, 23. März 2017, 10:00–10:15, HÜL 186

Cluster Formation and Deformation of Spherical Circle Swimmers Dispersed on a Monolayer — •Guo-Jun Liao and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

Inspired by recent experimental developments in manufacturing "active" colloidal particles with unusual, e.g. curved, modes of motion (such as form-anisotropic particles [1] or decorated metallodielectric Janus spheres [2]), as well as by the proceeding of a theoretical study on the collective behavior of curved polymers with circular paths [3], we computationally investigate models of spherical particles in which the colloids dispersed on a monolayer feel not only a propelling force, but also a propelling torque. In the absence of propulsion torque (without circular motion), we find clustering of "conventional" self-propelled disks, in accordance with Ref. [4]. We show that the motility-induced cluster formation is enhanced by polar interaction, and cumulatively hindered by increasing the propulsion angular velocity ω0. Different from the model of curved polymers [3], in which the occurrence of stable vortices is attributed to the shape anisotropy, our generic model of isotropic "active" spheres also form clockwise vortices as ω0 approaches the rotational diffusion coefficient Dr.
[1] F. Kümmel et al., Phys. Rev. Lett. 110, 198302 (2013)

[2] S. Gangwal et al., Phys. Rev. Lett. 100, 058302 (2008)

[3] J. Denk et al., Phys. Rev. Lett. 116, 178301 (2016)

[4] J. Bialke et al., EPL 103, 30008 (2013)

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