Spiers Memorial Lecture: Effect of interaction specificity on the phase behaviour of patchy particles

Nicolas Dorsaz; Laura Filion; Frank Smallenburg; Daan Frenkel

doi:10.1039/C2FD20070H

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Faraday Discussions

Issue 1, 2012

Discussion summary and research papers, in physical chemistry, chemical physics and biophysical chemistry.

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Spiers Memorial Lecture: Effect of interaction specificity on the phase behaviour of patchy particles

Nicolas Dorsaz,^a Laura Filion,^a Frank Smallenburg^b and Daan Frenkel^a

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Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, UK

Soft Condensed Matter, Deybe Institute for NanoMaterials Science, Utrecht University, Princetonplein 5, The Netherlands

Faraday Discuss., 2012,159, 9-21

DOI: 10.1039/C2FD20070H
Received 10 Apr 2012, Accepted 06 Jun 2012
First published online 07 Jun 2012

This article is part of themed collection: Crystallisation – A Biological Perspective

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We report a numerical study on the phase behaviour of a ‘patch–anti-patch’ model for particles with tetrahedrally arranged attractive spots. In particular, we compute the phase equilibria between the fluid and a low density diamond cubic (DC) crystal for different realizations of the patch–anti-patch interaction. By increasing the ‘specificity’ of the patches, i.e. lowering the number of corresponding attractive ‘anti-patches’ to a given patch, we find that the metastability gap between the DC freezing boundary and the liquid–gas critical point widens considerably. We argue that this effect of interaction specificity is relevant for the description of protein phase diagrams, as patch–anti-patch interactions can stabilise relatively open, ordered structures.

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