Issue 27, 2019

Phase behavior and design rules for plastic colloidal crystals of hard polyhedra via consideration of directional entropic forces

Abstract

Plastic crystals – like liquid crystals – are mesophases that can exist between liquids and crystals and possess some of the characteristic traits of each of these states of matter. Plastic crystals exhibit translational order but orientational disorder. Here, we characterize the phase behavior in systems of hard polyhedra that self-assemble plastic face-centered cubic (pFCC) colloidal crystals. We report a first-order transition from a pFCC to a body-centered tetragonal (BCT) crystal, a smooth crossover from pFCC to an orientationally-ordered FCC crystal, and an apparent orientational glass transition wherein long-range order fails to develop from a plastic crystal upon an increase in density. Using global order parameters and local environment descriptors, we describe how particle shape influences the development of orientational order with increasing density, and we provide design rules based on the arrangement of facets for engineering plastic crystal behavior in colloidal systems.

Graphical abstract: Phase behavior and design rules for plastic colloidal crystals of hard polyhedra via consideration of directional entropic forces

Supplementary files

Article information

Article type
Paper
Submitted
31 Dec 2018
Accepted
21 May 2019
First published
23 May 2019

Soft Matter, 2019,15, 5380-5389

Author version available

Phase behavior and design rules for plastic colloidal crystals of hard polyhedra via consideration of directional entropic forces

A. S. Karas, J. Dshemuchadse, G. van Anders and S. C. Glotzer, Soft Matter, 2019, 15, 5380 DOI: 10.1039/C8SM02643B

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