Regensburg 2022 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 4: Active Matter 1 (joint session BP/CPP/DY)
BP 4.7: Vortrag
Montag, 5. September 2022, 12:30–12:45, H16
Diffusiophoretic propulsion of an isotropic active particle near a finite-sized disk — •Abdallah Daddi-Moussa-Ider1, Andrej Vilfan1,2, and Ramin Golestanian1,3 — 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany — 2Jozef Stefan Institute, 1000 Ljubljana, Slovenia — 3Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
We employ a far-field analytical model to quantify the leading-order contribution to the induced phoretic velocity of an isotropic active colloid near a finite-sized disk of circular shape resting on an interface separating two immiscible viscous incompressible Newtonian fluids.
To this aim, we formulate the solution of the phoretic problem as a mixed-boundary-value problem which we then transform into a system of dual integral equations on the inner and outer domains.
Depending on the ratio of different involved viscosities and solute solubilities, the sign of phoretic mobility and chemical activity, as well as the ratio of particle-interface distance to the radius of the disk, we find the isotropic active particle to be repelled from the interface, be attracted to it, or reach a stable hovering state and remain immobile near the interface.
Our results may prove useful in controlling and guiding the motion of self-propelled phoretic active particles near aqueous interfaces.
Reference: A. Daddi-Moussa-Ider, A. Vilfan, and R. Golestanian, J. Fluid Mech. 940 A12 (2022)