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Issue 46, 2018
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Crossover from three- to six-fold symmetry of colloidal aggregates in circular traps

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Abstract

At sufficiently low temperatures and high densities, repulsive spherical particles in two-dimensions (2d) form close-packed structures with six-fold symmetry. By contrast, when the interparticle interaction has an attractive anisotropic component, the structure may exhibit the symmetry of the interaction. We consider a suspension of spherical particles interacting through an isotropic repulsive potential and a three-fold symmetric attractive interaction, confined in circular potential traps in 2d. We find that, due to the competition between the interparticle and the external potentials, the particles self-organize into structures with three- or six-fold symmetry, depending on the width of the traps. For intermediate trap widths, a core–shell structure is formed, where the core has six-fold symmetry and the shell is three-fold symmetric. When the width of the trap changes periodically in time, the symmetry of the colloidal structure also changes, but it does not necessarily follow that of the corresponding static trap.

Graphical abstract: Crossover from three- to six-fold symmetry of colloidal aggregates in circular traps

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Article information


Submitted
12 Sep 2018
Accepted
05 Nov 2018
First published
06 Nov 2018

Soft Matter, 2018,14, 9411-9417
Article type
Paper

Crossover from three- to six-fold symmetry of colloidal aggregates in circular traps

T. Geigenfeind, C. S. Dias, M. M. Telo da Gama, D. de las Heras and N. A. M. Araújo, Soft Matter, 2018, 14, 9411
DOI: 10.1039/C8SM01867G

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