Phase diagram of colloidal spheres in a biaxial electric or magnetic field
Phase diagram of colloidal spheres in a biaxial electric or magnetic field
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DOI：
10.1063/1.3425734
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发表时间：
2010-05-28
影响因子：
4.4
通讯作者：
Dijkstra, Marjolein
中科院分区：
文献类型：
--
作者：
Smallenburg, Frank;Dijkstra, Marjolein
在外部双轴磁场或电场中，介电常数与周围溶剂不匹配的胶体颗粒经历“反向”偶极相互作用。我们确定这样一个系统的相行为，使用亥姆霍兹自由能计算在Monte Carlo模拟胶体硬球以及带电硬球与排斥汤川势相互作用。具有反向偶极相互作用的胶体硬球的相图显示气-液转变、六方ABC堆叠晶体相和拉伸的六方密堆积晶体。带电球体的相图非常相似，但显示了额外的分层流体相。我们比较我们的结果与最近的实验观察。(C)2010年美国物理学会。[doi：10.1063/1.3425734]
Colloidal particles with a dielectric constant mismatch with the surrounding solvent in an external biaxial magnetic or electric field experience an "inverted" dipolar interaction. We determine the phase behavior of such a system using Helmholtz free energy calculations in Monte Carlo simulations for colloidal hard spheres as well as for charged hard spheres interacting with a repulsive Yukawa potential. The phase diagram of colloidal hard spheres with inverted dipolar interactions shows a gas-liquid transition, a hexagonal ABC stacked crystal phase, and a stretched hexagonal-close-packed crystal. The phase diagram for charged spheres is very similar, but displays an additional layered-fluid phase. We compare our results with recent experimental observations. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3425734]