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Issue 9, 2011
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Polydispersity induced solid–solid transitions in model colloids

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Abstract

Specialized Monte Carlo simulation techniques and moment free energy method calculations, capable of treating fractionation exactly, are deployed to study the crystalline phase behaviour of an assembly of spherical particles described by a top-hat “parent” distribution of particle sizes. An increase in either the overall density or the degree of polydispersity is shown to generate a succession of phase transitions in which the system demixes into an ever greater number of face-centred cubic “daughter” phases. Each of these phases is strongly fractionated: it contains a much narrower distribution of particle sizes than is present in the system overall. Certain of the demixing transitions are found to be nearly continuous, accompanied by fluctuations in local particle size correlated over many lattice spacings. We explore possible factors controlling the stability of the phases and the character of the demixing transitions.

Graphical abstract: Polydispersity induced solid–solid transitions in model colloids

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Publication details

The article was received on 23 Nov 2010, accepted on 09 Feb 2011 and first published on 21 Mar 2011


Article type: Paper
DOI: 10.1039/C0SM01367F
Soft Matter, 2011,7, 4472-4484

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    Polydispersity induced solid–solid transitions in model colloids

    P. Sollich and N. B. Wilding, Soft Matter, 2011, 7, 4472
    DOI: 10.1039/C0SM01367F

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