Layering, freezing, and re-entrant melting of hard spheres in soft confinement

Curk, Tine and de Hoogh, Anouk and Martinez-Veracoechea, Francisco J. and Eiser, Erika and Frenkel, Daan and Dobnikar, Jure and Leunissen, Mirjam E. (2012) Layering, freezing, and re-entrant melting of hard spheres in soft confinement. Physical Review E, 85 (2). 021502. DOI

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Confinement can have a dramatic effect on the behavior of all sorts of particulate systems, and it therefore is an important phenomenon in many different areas of physics and technology. Here, we investigate the role played by the softness of the confining potential. Using grand canonical Monte Carlo simulations, we determine the phase diagram of three-dimensional hard spheres that in one dimension are constrained to a plane by a harmonic potential. The phase behavior depends strongly on the density and on the stiffness of the harmonic confinement. While we find the familiar sequence of confined hexagonal and square-symmetric packings, we do not observe any of the usual intervening ordered phases. Instead, the system phase separates under strong confinement, or forms a layered re-entrant liquid phase under weaker confinement. It is plausible that this behavior is due to the larger positional freedom in a soft confining potential and to the contribution that the confinement energy makes to the total free energy. The fact that specific structures can be induced or suppressed by simply changing the confinement conditions (e.g., in a dielectrophoretic trap) is important for applications that involve self-assembled structures of colloidal particles.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA62;
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Physical Review E
Volume: 85
Page Range: 021502
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 05 Apr 2012 16:25
Last Modified: 23 Jul 2013 10:04

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