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Re-entrant melting and freezing in a model system of charged colloids

机译:带电荷胶体模型系统中的折返融化和冻结

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We studied the phase behavior of charged and sterically stabilized colloids using confocal microscopy in a low polarity solvent (dielectric constant 5.4). Upon increasing the colloid volume fraction we found a transition from a fluid to a body centered cubic crystal at 0.0415 +/- 0.0005, followed by reentrant melting at 0.1165 +/- 0.0015. A second crystal of different symmetry, random hexagonal close packed, was formed at a volume fraction around 0.5, similar to that of hard spheres. We attribute the intriguing phase behavior to the particle interactions that depend strongly on volume fraction, mainly due to the changes in the colloid charge. In this low polarity system the colloids acquire charge through ion adsorption. The low ionic strength leads to fewer ions per colloid at elevated volume fractions and consequently a density-dependent colloid charge. (c) 2006 American Institute of Physics.
机译:我们使用共聚焦显微镜在低极性溶剂(介电常数5.4)中研究了带电和空间稳定的胶体的相行为。随着胶体体积分数的增加,我们发现从流体到体心立方晶体的跃迁为0.0415 +/- 0.0005,然后折返融解为0.1165 +/- 0.0015。与硬球相似,形成了另一种对称性不同的晶体,即六方密堆积的随机六方晶体。我们将有趣的相行为归因于很大程度上取决于体积分数的粒子相互作用,这主要归因于胶体电荷的变化。在这种低极性系统中,胶体通过离子吸附获得电荷。低的离子强度导致在提高的体积分数下每个胶体的离子更少,因此导致了密度依赖性胶体电荷。 (c)2006年美国物理研究所。

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