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Phase Diagram of Dipolar Hard and Soft Spheres: Manipulation of Colloidal Crystal Structures by an External Field

Phase Diagram of Dipolar Hard and Soft Spheres: Manipulation of Colloidal Crystal Structures by... Phase diagrams of hard and soft spheres with a fixed dipole moment are determined by calculating the Helmholtz free energy using simulations. The pair potential is given by a dipole-dipole interaction plus a hard-core and a repulsive Yukawa potential for soft spheres. Our system models colloids in an external electric or magnetic field, with hard spheres corresponding to uncharged and soft spheres to charged colloids. The phase diagram of dipolar hard spheres shows fluid, face-centered-cubic (fcc), hexagonal-close-packed (hcp), and body-centered-tetragonal (bct) phases. The phase diagram of dipolar soft spheres exhibits, in addition to the above mentioned phases, a body-centered-orthorhombic (bco) phase, and it agrees well with the experimental phase diagram Nature (London) NATUAS 0028-0836 421 , 513 ( 2003 ) 10.1038/nature01328 . Our results show that bulk hcp, bct, and bco crystals can be realized experimentally by applying an external field. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Phase Diagram of Dipolar Hard and Soft Spheres: Manipulation of Colloidal Crystal Structures by an External Field

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2005 The American Physical Society
ISSN
1079-7114
DOI
10.1103/PhysRevLett.94.138303
pmid
15904046
Publisher site
See Article on Publisher Site

Abstract

Phase diagrams of hard and soft spheres with a fixed dipole moment are determined by calculating the Helmholtz free energy using simulations. The pair potential is given by a dipole-dipole interaction plus a hard-core and a repulsive Yukawa potential for soft spheres. Our system models colloids in an external electric or magnetic field, with hard spheres corresponding to uncharged and soft spheres to charged colloids. The phase diagram of dipolar hard spheres shows fluid, face-centered-cubic (fcc), hexagonal-close-packed (hcp), and body-centered-tetragonal (bct) phases. The phase diagram of dipolar soft spheres exhibits, in addition to the above mentioned phases, a body-centered-orthorhombic (bco) phase, and it agrees well with the experimental phase diagram Nature (London) NATUAS 0028-0836 421 , 513 ( 2003 ) 10.1038/nature01328 . Our results show that bulk hcp, bct, and bco crystals can be realized experimentally by applying an external field.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Apr 8, 2005

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