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Issue 33, 2020
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Topological defects of dipole patchy particles on a spherical surface

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Abstract

We investigate the assembly of dipole-like patchy particles confined to a spherical surface by Brownian dynamics simulations. The surface property of the spherical particle is described by the spherical harmonic Y10, and the orientation of the particle is defined as the uniaxial axis. On a flat space, we observe a defect-free square lattice with nematic order. On a spherical surface, defects appear due to the topological constraint. As for the director field, four defects of winding number +1/2 are observed, satisfying the Euler characteristic. We have found many configurations of the four defects lying near a great circle. Regarding the positional order for the square lattice, eight grain boundary scars proliferate linearly with the sphere size. The positions and orientations of the eight grain boundary scars are strongly related to the four +1/2 defect cores.

Graphical abstract: Topological defects of dipole patchy particles on a spherical surface

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Article information


Submitted
16 Jan 2020
Accepted
19 Jun 2020
First published
17 Aug 2020

This article is Open Access

Soft Matter, 2020,16, 7667-7675
Article type
Paper

Topological defects of dipole patchy particles on a spherical surface

U. T. Lieu and N. Yoshinaga, Soft Matter, 2020, 16, 7667
DOI: 10.1039/D0SM00103A

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