软排斥球二元中的大吸引耗尽相互作用 混合物

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摘要翻译：
我们考虑软排斥球形颗粒的二元混合物，用不同的理论和模拟方法计算了在小球体流体介导下两个大球体之间的耗尽相互作用。根据小球体密度的维里展开，验证了理论方法的有效性，并与模拟结果进行了对比。注意到接近硬球极限的方法，以及密度和温度对耗尽势强度的影响。令人惊讶的是，我们的结果表明，即使在控制粒子之间直接相互作用的对势中有一个适度的软度，也可能导致大球的总有效势比硬球的总有效势更吸引人。这可能导致软排斥球的二元混合物在相行为、结构和动力学上的显著差异。特别地，在大小球比为0.2的情况下，应用微扰格式预测了大球通过耗尽力相互作用的有效体系的相图；这张图包括了通常的流固转变，但在软球的情况下，亚稳态的流-液转变，在硬球混合物中可能不存在，就直接的流-固共存而言，接近稳定。从这些结果可以看出，对于足够软的排斥粒子，这种相变可以变得稳定。讨论了实际胶体分散体相行为的可能含义。
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英文标题：
《Large Attractive Depletion Interactions in Soft Repulsive-Sphere Binary
  Mixtures》
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作者：
Giorgio Cinacchi, Yuri Martinez-Raton, Luis Mederos, Guillelmo
  Navascues, Alessandro Tani, Enrique Velasco
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Soft Condensed Matter        软凝聚态物质
分类描述：Membranes, polymers, liquid crystals, glasses, colloids, granular matter
膜，聚合物，液晶，玻璃，胶体，颗粒物质
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
--

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英文摘要：
  We consider binary mixtures of soft repulsive spherical particles and calculate the depletion interaction between two big spheres mediated by the fluid of small spheres, using different theoretical and simulation methods. The validity of the theoretical approach, a virial expansion in terms of the density of the small spheres, is checked against simulation results. Attention is given to the approach toward the hard-sphere limit, and to the effect of density and temperature on the strength of the depletion potential. Our results indicate, surprisingly, that even a modest degree of softness in the pair potential governing the direct interactions between the particles may lead to a significantly more attractive total effective potential for the big spheres than in the hard-sphere case. This might lead to significant differences in phase behavior, structure and dynamics of a binary mixture of soft repulsive spheres. In particular, a perturbative scheme is applied to predict the phase diagram of an effective system of big spheres interacting via depletion forces for a size ratio of small and big spheres of 0.2; this diagram includes the usual fluid-solid transition but, in the soft-sphere case, the metastable fluid-fluid transition, which is probably absent in hard-sphere mixtures, is close to being stable with respect to direct fluid-solid coexistence. From these results the interesting possibility arises that, for sufficiently soft repulsive particles, this phase transition could become stable. Possible implications for the phase behavior of real colloidal dispersions are discussed.
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PDF链接：
https://arxiv.org/pdf/706.1633

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关键词：相互作用 混合物 interactions Implications Perturbative phase small 理论 spheres 排斥