| The equilibrium phase behavior of Janus fluids is examined based on a model potential for the interaction between their constituents. Janus fluids consist of axisymmetric particles possessing to different `faces', e.g. one hydrophobic and one hydrophilic surface, and the interaction depends on the relative orientation. Starting from a short range, isotropic potential we make an ansatz for an anisotropic model interaction potential. The Helmholtz free energy and the pressure are calculated by the help of an augmented van der Waals approximation. A qualitative phase diagram is obtained. The appearance of a polar phase and the corresponding transition temperature are examined adapting a Landau de Gennes expansion of the orientational part of the free energy. Monte Carlo simulations are performed to test the approximation involved in the analytical description.
for LaTeX users @article{TErdmann2003-67,
author = {T. Erdmann and M. Kr\"oger and S. Hess},
title = {Phase behavior and structure of Janus fluids},
journal = {Phys. Rev. E},
volume = {67},
pages = {041209},
year = {2003}
}
\bibitem{TErdmann2003-67} T. Erdmann, M. Kr\"oger, S. Hess,
Phase behavior and structure of Janus fluids,
Phys. Rev. E {\bf 67} (2003) 041209 (17 pages).TErdmann2003-67
T. Erdmann, M. Kr\"oger, S. Hess
Phase behavior and structure of Janus fluids
Phys. Rev. E,67,2003,041209 (17 pages) |
mk@mat.ethz.ch
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