NDLI: Morphology of clusters of attractive dry and wet self-propelled spherical particle suspensions

Content Provider	Royal Society of Chemistry (RSC)
Author	Pagonabarraga, Ignacio Valeriani, Chantal Alarcón, Francisco
Copyright Year	2017
Abstract	In order to assess the effect of hydrodynamics in the assembly of active attractive spheres, we simulate a semi-dilute suspension of attractive self-propelled spherical particles in a quasi-two dimensional geometry comparing the case with and without hydrodynamics interactions. To start with, independent of the presence of hydrodynamics, we observe that depending on the ratio between attraction and propulsion, particles either coarsen or aggregate forming finite-size clusters. Focusing on the clustering regime, we characterize two different cluster parameters, i.e. their morphology and orientational order, and compare the case when active particles behave either as pushers or pullers (always in the regime where inter-particle attractions compete with self-propulsion). Studying cluster phases for squirmers with respect to those obtained for active Brownian disks (indicated as ABPs), we have shown that hydrodynamics alone can sustain a cluster phase of active swimmers (pullers), while ABPs form cluster phases due to the competition between attraction and self-propulsion. The structural properties of the cluster phases of squirmers and ABPs are similar, although squirmers show sensitivity to active stresses. Active Brownian disks resemble weakly pusher squirmer suspensions in terms of cluster size distribution, structure of the radius of gyration on the cluster size and degree of cluster polarity.
Starting Page	814
Ending Page	826
Page Count	13
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	13
Issue Number	4
Journal	Soft Matter
DOI	10.1039/c6sm01752e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Geometry Fluid dynamics ABPs SoltyRei
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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