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Morphology of clusters of attractive dry and wet self-propelled spherical particle suspensions | | Francisco Alarcón
; Chantal Valeriani
; Ignacio Pagonabarraga
; | | Date: |
13 Dec 2016 | | Abstract: | In order to asses 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,
independently on 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 clusters 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-particles attractions
competes with self-propulsion). Studying cluster phases for squirmers with
respect to those obtained for active Brownian disks (indicated as ABP), we have
shown that hydrodynamics alone can sustain a cluster phase of active swimmers
(pullers), while ABP form cluster phases due to the competition between
attraction and self propulsion. The structural properties of the cluster phases
of squirmers and ABP 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
cluster size and degree of cluster polarity. | | Source: | arXiv, 1612.3987 | | Services: | Forum | Review | PDF | Favorites | |
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