Pair-correlation functions and phase separation in a two-component point Yukawa uid

نویسندگان

  • P. Hopkins
  • A. J. Archer
  • R. Evans
  • H. H. Wills
چکیده

Pair-correlation functions and phase separation in a two-component point Yukawa uid. Articles you may be interested in Interfacial and wetting properties of a binary point Yukawa fluid Microphase separation in multigraft copolymer melts studied by random-phase approximation and self-consistent field theory Phase separation of a binary two-dimensional core-softened fluid Solvent-mediated interactions and solvation close to fluid–fluid phase separation:A density functional treatment We investigate the structure of a binary mixture of particles interacting via purely repulsive point Yukawa pair potentials with a common inverse screening length ␭. Using the hypernetted chain closure to the Ornstein-Zernike equations, we find that for a system with " ideal " ͑Berthelot mixing rule͒ pair-potential parameters for the interaction between unlike species, the asymptotic decay of the total correlation functions crosses over from monotonic to damped oscillatory on increasing the fluid total density at fixed composition. This gives rise to a Kirkwood line in the phase diagram. We also consider a " nonideal " system, in which the Berthelot mixing rule is multiplied by a factor ͑1+␦͒. For any ␦ Ͼ 0 the system exhibits fluid-fluid phase separation and remarkably the ultimate decay of the correlation functions is now monotonic for all ͑mixture͒ state points. Only in the limit of vanishing concentration of either species does one find oscillatory decay extending to r = ϱ. In the nonideal case the simple random-phase approximation provides a good description of the phase separation and the accompanying Lifshitz line.

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تاریخ انتشار 2017