Caballero José B, Puertas Antonio M, Fernández-Barbero Antonio, de las Nieves F Javier
Group of Complex Fluids Physics, Department of Applied Physics, University of Almeria, 04120, Spain.
J Chem Phys. 2004 Aug 1;121(5):2428-35. doi: 10.1063/1.1767995.
The equilibrium phase diagram of a colloidal system composed of 1:1 mixture of positive and negative particles with equal charge is studied by means of Monte Carlo simulations. The system is the colloidal analog of the restricted primitive model (RPM) for ionic fluids. A liquid-gas transition is found in the low-temperature-low-density region, similar to the liquid-gas transition in the RPM. The fluid-crystal transition is also studied, and the liquid phase is shown to be stable in a narrow range of temperatures. In the liquid, the pair distribution function shows alternating layers of particles with opposite sign of charge surrounding every particle. In the vapor phase, clusters of particles are observed, again in agreement with the RPM. However, a decreasing distribution of clusters is obtained, instead of the discrimination between charged and neutral clusters found in the RPM.
通过蒙特卡罗模拟研究了由等量正负电荷粒子的1:1混合物组成的胶体系统的平衡相图。该系统是离子流体受限原始模型（RPM）的胶体类似物。在低温低密度区域发现了液-气转变，类似于RPM中的液-气转变。还研究了流体-晶体转变，结果表明液相在狭窄的温度范围内是稳定的。在液相中，对分布函数显示每个粒子周围有交替的带相反电荷的粒子层。在气相中，观察到粒子簇，这同样与RPM一致。然而，得到的是簇的递减分布，而不是RPM中发现的带电簇和中性簇之间的区分。
