Phase diagrams of Janus fluids with up-down constrained orientations
Abstract
A class of binary mixtures of Janus fluids formed by colloidal spheres with the hydrophobic hemispheres constrained to point either up or down are studied by means of Gibbs ensemble Monte Carlo simulations and simple analytical approximations. These fluids can be experimentally realized by the application of an external static electrical field. The gas-liquid and demixing phase transitions in five specific models with different patch-patch affinities are analyzed. It is found that a gas-liquid transition is present in all the models, even if only one of the four possible patch-patch interactions is attractive. Moreover, provided the attraction between like particles is stronger than between unlike particles, the system demixes into two subsystems with different composition at sufficiently low temperatures and high densities.
Keywords
Cite
@article{arxiv.1310.5044,
title = {Phase diagrams of Janus fluids with up-down constrained orientations},
author = {Riccardo Fantoni and Achille Giacometti and Miguel Ángel G. Maestre and Andrés Santos},
journal= {arXiv preprint arXiv:1310.5044},
year = {2013}
}
Comments
10 pages, 6 figures