Finite-size scaling analysis of isotropic–polar phase transitions in an amphiphilic fluid

Finite-size scaling analysis of isotropic–polar phase transitions in an amphiphilic fluid
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两亲流体中各向同性极性相变的有限尺寸尺度分析

DOI:
10.1088/0953-8984/24/3/035103
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发表时间:
2011
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Martin Schoen
Martin Schoen
中科院分区:
--
文献类型:
--
作者:
Michael Melle;Stefano Giura;Sergej Schlotthauer;Martin Schoen

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我们提出了在等温-等压集合中进行的两亲性流体的各向同性-极性(IP)相变的蒙特卡罗模拟。我们的模型由伦纳德-琼斯球组成,其中势能的吸引部分由方向相关函数修改。这个函数引起分子间引力的角度依赖,与点偶极子的特征相对应。我们的数据显示了系统大小对偶极序参数的依赖性。我们根据阶参数分布和包含其一阶矩和其二阶矩的累积量来分析系统大小的依赖性。序参量及其分布和磁化率观察了三维Ising普适类的标度行为特征。由于这种缩放行为,并且由于无论系统大小如何,所有累积量都有一个共同的交叉点,我们得出结论,IP相变是连续的。当压力1.3≤P≤3.0时,我们证明了存在一条类似于铁电相变系统中的居里线的连续相变线。我们的结果在质量上与朗道的连续相变理论一致。
We present Monte Carlo simulations of the isotropic–polar (IP) phase transition in an amphiphilic fluid carried out in the isothermal–isobaric ensemble. Our model consists of Lennard-Jones spheres where the attractive part of the potential is modified by an orientation-dependent function. This function gives rise to an angle dependence of the intermolecular attractions corresponding to that characteristic of point dipoles. Our data show a substantial system-size dependence of the dipolar order parameter. We analyze the system-size dependence in terms of the order-parameter distribution and a cumulant involving its first and second moments. The order parameter, its distribution, and susceptibility observe the scaling behavior characteristic of the 3D Ising universality class. Because of this scaling behavior and because all cumulants have a common intersection irrespective of system size we conclude that the IP phase transition is continuous. Considering pressures 1.3≤ P≤ 3.0 we demonstrate that a line of continuous phase transitions exists which is analogous to the Curie line in systems exhibiting a ferroelectric transition. Our results are qualitatively consistent with Landau's theory of continuous phase transitions.
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影响因子: --
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