This study demonstrates nonreciprocal interactions create self-propelled pairs in binary colloids, suggesting new possibilities for engineered active matter.
We study binary colloids under AC electric fields, where electrohydrodynamic (EHD) flows generate nonreciprocal interactions. Mixing particles of different sizes produces self-propelled pairs that fragment and reassemble into persistent active clusters, unlike the static crystallization of single-sized systems. Agent-based and continuum models reproduce these dynamics and identify two key mechanisms: asymmetric pair propulsion and spray-like fission from excluded-volume polarity. These results establish a minimal, controllable platform for exploring nonreciprocal active matter and highlight nonreciprocity as a general route to engineer reconfigurable colloidal assemblies.
No takes yet. Share an insight, caveat, or question.
Hara et al. (2025) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: