Critical phenomena in colloid-polymer mixtures: interfacial tension, order parameter, susceptibility, and coexistence diameter.
Critical phenomena in colloid-polymer mixtures: interfacial tension, order parameter, susceptibility, and coexistence diameter.
复制标题
胶体-聚合物混合物中的关键现象：界面张力、有序参数、磁化率和共存直径。
DOI：
10.1103/physreve.71.011401
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Binder
中科院分区：
文献类型：
--
作者：
R. Vink;J. Horbach;K. Binder
利用计算机模拟和有限尺寸标度技术研究了一个模型胶体-聚合物混合物的临界行为，即所谓的Asakura-Oosawa（AO）模型。考察了界面张力、序参量、磁化率和共存直径。我们的结果清楚地表明，界面张力消失在临界点处的指数2nu约为1.26。这与3D伊辛指数非常一致。还计算了临界振幅比，这是与相应的三维伊辛值兼容。我们还确定了一些微妙之处，遇到有限尺寸缩放时，适用于AO模型。特别是，我们发现，接近临界点，有限尺寸外推的界面张力是最一致的对数尺寸依赖性被忽略时。
The critical behavior of a model colloid-polymer mixture, the so-called Asakura-Oosawa (AO) model, is studied using computer simulations and finite size scaling techniques. Investigated are the interfacial tension, the order parameter, the susceptibility, and the coexistence diameter. Our results clearly show that the interfacial tension vanishes at the critical point with exponent 2nu approximately 1.26 . This is in good agreement with the 3D Ising exponent. Also calculated are critical amplitude ratios, which are shown to be compatible with the corresponding 3D Ising values. We additionally identify a number of subtleties that are encountered when finite size scaling is applied to the AO model. In particular, we find that close to the critical point, the finite size extrapolation of the interfacial tension is most consistent when logarithmic size dependences are ignored.