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Unravelling the role of phoretic and hydrodynamic interactions in active colloidal suspensions

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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.

Graphical abstract: Unravelling the role of phoretic and hydrodynamic interactions in active colloidal suspensions

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Article information


Submitted
07 Sep 2018
Accepted
06 Aug 2020
First published
07 Aug 2020

This article is Open Access

Soft Matter, 2020, Advance Article
Article type
Paper

Unravelling the role of phoretic and hydrodynamic interactions in active colloidal suspensions

A. Scagliarini and I. Pagonabarraga, Soft Matter, 2020, Advance Article , DOI: 10.1039/C8SM01831F

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