Field driven cluster formation in two-dimensional colloidal binary mixtures

TL;DR

This study investigates how external electric fields induce cluster formation in a two-dimensional binary colloidal mixture with size and charge asymmetry, revealing stable vibrational wavepackets and a critical driving force for clustering.

Contribution

It introduces a model demonstrating field-driven cluster formation and vibrational wavepackets in colloidal mixtures, highlighting the role of external forces in pattern emergence.

Findings

Cluster formation occurs above a critical external force.

Stable vibrational wavepackets are observed in large particles.

Clustering pattern depends on size and charge asymmetry.

Abstract

We study size- and charge-asymmetric oppositely charged colloids driven by an external electric field. The large particles are connected by harmonic springs, forming a hexagonal-lattice network while the small particles are free of bonds and exhibit fluid-like motion. We show that this model exhibits a cluster formation pattern when the external driving force exceeds a critical value. The clustering is accompanied with stable wavepackets in vibrational motions of the large particles.