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DY: Fachverband Dynamik und Statistische Physik

DY 52: Poster: Active Matter, Microswimmer, Microfluidics

DY 52.1: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster B2

Active Rotation of Janus particles — •Burelbach Jérôme and Stark Holger — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

The active motion of Janus particles offers a wide range of interesting applications, from dynamic clustering [1] and microrotation [2] to the self-assembly of rotating micro-machines [3]. We theoretically study the rotation of active particles based on Onsager's reciprocal relations [4], by exploiting the fact that the corresponding Onsager transport coefficients are skew-symmetric. In particular, we present a theoretical model for a self-rotating particle, showing that self-rotation relies on two asymmetries, one in the interfacial interaction with the surrounding fluid, and the other in the thermodynamic field created by the particle.

[1] Pohl, O., & Stark, H. (2015). Self-phoretic active particles interacting by diffusiophoresis: A numerical study of the collapsed state and dynamic clustering. European Physical Journal E, 38(8).

[2] Jiang, Hong-Ren, Natsuhiko Yoshinaga, and Masaki Sano. "Active motion of a Janus particle by self-thermophoresis in a defocused laser beam." Physical review letters 105.26 (2010): 268302.

[3] Maggi, Claudio, et al. "Self-assembly of micromachining systems powered by Janus micromotors." Small 12.4 (2016): 446-451.

[4] Onsager, Lars. "Reciprocal relations in irreversible processes. I." Physical review 37.4 (1931): 405.