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Title: Unravelling the role of phoretic and hydrodynamic interactions in active colloidal suspensions
Author: Scagliarini, Andrea
Pagonabarraga Mora, Ignacio
Keywords: Hidrodinàmica
Fenòmens mesoscòpics (Física)
Mesoscopic phenomena (Physics)
Issue Date: 7-Aug-2020
Publisher: Royal Society of Chemistry
Abstract: Active fluids comprise a variety of systems composed of elements immersed in a fluid environment which can convert some form of energy into directed motion; as such they are intrinsically out-of-equilibrium in the absence of any external force. A fundamental problem in the physics of active matter concerns the understanding of how the characteristics of autonomous propulsion and agent-agent interactions determine the collective dynamics of the system. We study numerically the suspensions of self-propelled diffusiophoretic colloids, in (quasi)-2d configurations, accounting for both dynamically resolved solute-mediated phoretic interactions and solvent-mediated hydrodynamic interactions. Our results show that the system displays different scenarios at changing the colloid-solute affinity and it develops a cluster phase in the chemoattractive case. We study the statistics of cluster sizes and cluster morphologies for different magnitudes of colloidal activity. Finally, we provide evidences that hydrodynamics plays a relevant role in the aggregation kinetics and cluster morphology, significantly hindering cluster growth.
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It is part of: Soft Matter, 2020, num. 16, p. 8893-8903
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ISSN: 1744-683X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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