METHODS TO COMPUTE PRESSURE AND WALL TENSION IN FLUIDS CONTAINING HARD PARTICLES

Debabrata Deb (), Dorothea Wilms, Alexander Winkler, Peter Virnau and Kurt Binder
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Debabrata Deb: Institut für Physik, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, D 55099 Mainz, Germany
Dorothea Wilms: Institut für Physik, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, D 55099 Mainz, Germany
Alexander Winkler: Institut für Physik, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, D 55099 Mainz, Germany
Peter Virnau: Institut für Physik, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, D 55099 Mainz, Germany
Kurt Binder: Institut für Physik, Johannes Gutenberg Universität Mainz, Staudinger Weg 7, D 55099 Mainz, Germany

International Journal of Modern Physics C (IJMPC), 2012, vol. 23, issue 08, 1-13

Abstract: Colloidal systems are often modeled as fluids of hard particles (possibly with an additional soft attraction, e.g. caused by polymers also contained in the suspension). In simulations of such systems, the virial theorem cannot be straightforwardly applied to obtain the components of the pressure tensor. In systems confined by walls, it is hence also not straightforward to extract the excess energy due to the wall (the “wall tension”) from the pressure tensor anisotropy. A comparative evaluation of several methods to circumvent this problem is presented, using as examples fluids of hard spheres and the Asakura–Oosawa model of colloid-polymer mixtures with a size ratioq = 0.15(for which the effect of the polymers can be integrated out to yield an effective attractive potential between the colloids). Factors limiting the accuracy of the various methods are carefully discussed, and controlling these factors very good mutual agreement between the various methods is found.

Keywords: Hard spheres; Asakura–Oosawa model; ensemble-mixing method; Monte Carlo simulation; 82.70.Dd; 05.10.Ln; 61.20.Ja; 68.08.-p (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1142/S0129183112400116

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