%0 Journal Article
%T Dynamics of Binary Active Clusters Driven by Ion-Exchange Particles
%J -
%D 2018
%R https://doi.org/10.1021/acsnano.8b04221
%X We present a framework to quantitatively predict the linear and rotational directed motion of synthetic modular microswimmers. To this end, we study binary dimers and characterize their approach motion as effective interactions within a minimal model. We apply this framework to the assembly of small aggregates composed of a cationic ion-exchange particle with up to five passive particles or anionic ion-exchange particles at dilute conditions. Particles sediment and move close to a substrate, above which the ion-exchange particles generate flow. This flow mediates long-range attractions leading to a slow collapse during which long-lived clusters of a few particles assemble. The effective interactions between unlike particles break Newton¡¯s third law. Depending on their symmetry, assemblies thus can become linear or circle swimmers, or remain inert (no directed motion)
%U https://pubs.acs.org/doi/10.1021/acsnano.8b04221