Polydispersity induced solid–solid transitions in model colloids

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. A...

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Published in:Soft matter 2011-01, Vol.7 (9), p.4472-4484
Main Authors: Sollich, Peter, Wilding, Nigel B
Format: Article
Language:English
Subjects:
Computer simulation
Correlation
Demixing
Density
Mathematical models
Monte Carlo methods
Phase transformations
Polydispersity
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description 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.
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source Royal Society of Chemistry Journals
subjects Computer simulation
Correlation
Demixing
Density
Mathematical models
Monte Carlo methods
Phase transformations
Polydispersity
title Polydispersity induced solid–solid transitions in model colloids
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