(722f) Shaped-Directed Dynamics of Active Colloids Powered By Induced-Charge Electrophoresis

Simple energy inputs can power active colloids to move through fluid environments. The symmetry and shape of these colloidal particles can direct their motion, which can lead to complex dynamic behavior. Engineering particle shape is therefore a potential avenue to rationally design the active colloids with useful functions. We systematically study the dynamics of polarizable particles of different shapes moving in an AC electric field by induced-charge electrophoresis (ICEP). By examining particles from each point group in three dimensions, we identify the possible rotational and translational motions. The 3D shape of these particles can be tailored to achieve desired dynamics such as oscillatory motions, helical trajectories, and complex periodic orbits. Our methodology can be applied to design shape-directed motions in active particles actuated by other energy inputs. As technologies like two-photon lithography become more commonplace and allow for the creation of colloidal particles with arbitrary shapes, geometric control promises to be a powerful method to program functional active colloids.