Self-propulsion of autophoretic particles
Par Sébastien Michelin, LadHyX, Ecole Polytechnique, Palaiseau, France
Mardi 16 Janvier, 14h, Salle des séminaires (215), 2ème étage, Bâtiment A4N
Designing artificial micro swimmers has so far mostly followed bio-inspired design, reproducing the helical flagellum of bacteria or the beating of sperm cells. Those require however an external magnetic forcing to move, and as such are not truly self-propelled. Fuel-based or phoretic swimmers represent a promising alternative approach. Exploiting short-range interactions and physicochemical exchanges with their environment, they create a net slip forcing at their boundary in response to a tracer gradient. In this presentation, I will propose an overview of our recent work on the fundamental principles driving the individual locomotion of such active colloids in low-Re flows, focusing specifically on the role of geometry and the different symmetry-breaking mechanisms.