Self Rolling Rods powered by Light and Chemical gradients – RODROLLS

Inspired by the ability of influenza viruses to self-roll on surfaces, we propose a to create artificial photoactive rod particles and investigate their propulsion as rotary motors close to hard and soft interfaces. Self-propulsion results from the interaction between the rod and a light/chemical field gradient normal to the surface, which creates an instability that leads to rolling. Hence, we aim at designing a new class of active particles, which go beyond existing mechanisms (Quinke, Leidenfrost and Fiberboid effects) .The rod geometry will allow us to tune the directionality of the persistent motion and observe dynamics in dilute and concentrated regimes to understand, control and exploit the activity generated by symmetric particles.In line with the groups’ expertise, new rod systems based on photoactive materials (Fe2O3, Ag, TiO2) will be designed by the German Team and studied theoretically and experimentally close to solid interfaces by the French Team.