Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Active Matter C (joint session DY/CPP)

DY 44.8: Vortrag

Donnerstag, 4. April 2019, 12:00–12:15, H19

Locomotion of self-acoustophoretic colloidal particles — •Johannes Voß and Raphael Wittkowski — Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany

During the last two decades, a large number of different realizations of artificial self-propelled colloidal particles has been developed. A particularly advantageous realization is given by self-acoustophoretic colloidal particles, which exhibit self-propulsion when they are exposed to ultrasound. Compared to other types of artificial self-propelled particles, they have a biocompatible propulsion mechanism and can move in various liquids and soft materials. Furthermore, they can permanently be supplied with energy and, via the ultrasound intensity, it is even possible to adjust their speed. This makes self-acoustophoretic particles relevant for potential applications in, for example, medicine and materials science. Up to now, however, these particles have not been investigated in depth. Even the details of their propulsion mechanism are still unclear.

Therefore, based on direct computational fluid dynamics simulations, we have extensively studied the locomotion of self-acoustophoretic colloidal particles. We present results that explain the self-propulsion mechanism of these particles and how their locomotion depends on the shape and other properties of the particles. Our results are helpful especially for future experimental work further investigating or applying self-acoustophoretic colloidal particles.