Self-assembly of colloidal molecules due to self-generated flow

Abstract

The emergence of structure through aggregation is a fascinating topic and of both fundamental and practical interest. Here we demonstrate that self-generated solvent flow can be used to generate long-range attractions on the colloidal scale, with sub-pico Newton forces extending into the millimeter-range. We observe a rich dynamic behavior with the formation and fusion of small clusters resembling molecules, the dynamics of which is governed by an effective conservative energy that decays as $1/r$. Breaking the flow symmetry, these clusters can be made active.

References in corpus (10)

• Dynamical clustering and phase separation in suspensions of self-propelled colloidal particles
• Statistical mechanics and dynamics of solvable models with long-range interactions
• Self-assembly of catalytically active colloidal molecules: Tailoring activity through surface chemistry
• Identification of structure in condensed matter with the topological cluster classification
• Crystallization kinetics of colloidal model suspensions: recent achievements and new perspectives
• Self-assembly of Active Colloidal Molecules with Dynamic Function
• Two-Dimensional Clusters of Colloidal Spheres: Ground States, Excited States, and Structural Rearrangements
• Microfluidic Pumping by Micromolar Salt Concentrations
• Shock waves in capillary collapse of colloids: a model system for two--dimensional screened Newtonian gravity
• Emergent self-propulsion at low Reynolds number

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