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Issue 13, 2013
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The effects of polydispersity and metastability on crystal growth kinetics

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Abstract

We investigate the effect of metastable gas–liquid (G–L) separation on crystal growth in a system of either monodisperse or slightly size-polydisperse square well particles, using a simulation setup that allows us to focus on the growth of a single crystal. Our system parameters are such that, inside the metastable G–L binodal, a macroscopic layer of the gas phase ‘coats’ the crystal as it grows, consistent with experiment and theoretical free energy considerations. Crucially, the effect of this metastable G–L separation on the crystal growth rate depends qualitatively on whether the system is polydisperse. We measure reduced polydispersity and qualitatively different local size ordering in the crystal relative to the fluid, proposing that the required fractionation is dynamically facilitated by the gas layer. Our results show that polydispersity and metastability, both ubiquitous in soft matter, must be considered in tandem if their dynamical effects are to be understood.

Graphical abstract: The effects of polydispersity and metastability on crystal growth kinetics

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Publication details

The article was received on 14 Nov 2012, accepted on 06 Feb 2013 and first published on 20 Feb 2013


Article type: Paper
DOI: 10.1039/C3SM27627A
Citation: Soft Matter, 2013,9, 3600-3612
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    The effects of polydispersity and metastability on crystal growth kinetics

    J. J. Williamson and R. M. L. Evans, Soft Matter, 2013, 9, 3600
    DOI: 10.1039/C3SM27627A

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