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Issue 12, 2019
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Symmetries in hard polygon systems determine plastic colloidal crystal mesophases in two dimensions

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Abstract

Orientational ordering is a necessary step in the crystallization of molecules and anisotropic colloids. Plastic crystals, which are possible mesophases between the fluid and fully ordered crystal, are translationally ordered but exhibit no long range orientational order. Here, we study the two-dimensional phase behavior of hard regular polygons with edge number n = 3–12. This family of particles provides a model system to isolate the effect of shape and symmetry on the existence of plastic crystal phases. We show that the symmetry group of the particle, G, and the symmetry group of the local environment in the crystal, H, together determine plastic colloidal crystal phase behavior in two dimensions. If G contains completely the symmetry elements of H, then a plastic crystal phase is absent. If G and H share some but not all nontrivial symmetry elements, then a plastic crystal phase exists with preferred particle orientations that recover the absent symmetry elements of the crystal; we call this phase the discrete plastic crystal phase. If G and H share no nontrivial symmetry elements, then a plastic crystal phase exists without preferred orientations, which we call an indiscrete plastic crystal.

Graphical abstract: Symmetries in hard polygon systems determine plastic colloidal crystal mesophases in two dimensions

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Publication details

The article was received on 04 Jan 2019, accepted on 12 Feb 2019 and first published on 23 Feb 2019


Article type: Paper
DOI: 10.1039/C9SM00016J
Soft Matter, 2019,15, 2571-2579

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    Symmetries in hard polygon systems determine plastic colloidal crystal mesophases in two dimensions

    W. Shen, J. Antonaglia, J. A. Anderson, M. Engel, G. van Anders and S. C. Glotzer, Soft Matter, 2019, 15, 2571
    DOI: 10.1039/C9SM00016J

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