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DY: Fachverband Dynamik und Statistische Physik

DY 44: Poster: Active Matter, Soft Matter, and Fluids

DY 44.13: Poster

Mittwoch, 11. März 2026, 15:00–18:00, P5

The impact of particle shape for self-diffusiophoresis — •Leif Peters¹, Benjamin J. Walker², and Christina Kurzthaler^{1, 3, 4} — ¹Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany — ²Department of Mathematics, University College London, WC1H 0AY London, UK — ³Center for Systems Biology Dresden, Pfotenhauerstraße 108, 01307 Dresden, Germany — ⁴Cluster of Excellence, Physics of Life, TU Dresden, Arnoldstraße 18, 01062 Dresden, Germany

Self-diffusiophoretic micron-sized particles are paradigmatic examples of synthetic microswimmers where the swimming behavior depends not only on the patterning of the chemically active surface, i.e., the activity and phoretic mobility, but also on the particle shape itself. Accounting for the governing chemical and hydrodynamic equations we investigate how the particle shape influences the self-propulsion velocity and the agent's chemotactic behavior. To derive analytical expressions for anisotropic and curved particles we employ slender body theory and the Lorentz reciprocal theorem. Furthermore, we corroborate our results with a boundary element method. Our numerical framework allows going beyond the slender-particle limit and lays the foundation for addressing the physics of hydro-chemically interacting active agents and the emergent collective phenomena.

Keywords: active colloids; self-diffusiophoresis; boundary element method; slender-body theory