Weeks-Chandler-Andersen perturbation theory: Difference between revisions
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The '''Weeks-Chandler- | The '''Weeks-Chandler-Andersen perturbation theory''' <ref>[http://dx.doi.org/10.1063/1.1674820 John D. Weeks, David Chandler and Hans C. Andersen "Role of Repulsive Forces in Determining the Equilibrium Structure of Simple Liquids", Journal of Chemical Physics '''54''' pp. 5237-5247 (1971)]</ref> is based on the following | ||
decomposition of the [[intermolecular pair potential]] (in particular, the [[Lennard-Jones model | Lennard-Jones potential]]): | decomposition of the [[intermolecular pair potential]] (in particular, the [[Lennard-Jones model | Lennard-Jones potential]]): | ||
Revision as of 12:31, 16 February 2012
The Weeks-Chandler-Andersen perturbation theory [1] is based on the following decomposition of the intermolecular pair potential (in particular, the Lennard-Jones potential):
The reference system pair potential is given by (Eq, 4):
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Phi_{\rm repulsive} (r) = \left\{ \begin{array}{ll} \Phi_{\rm LJ}(r) + \epsilon & {\rm if} \; r < 2^{1/6}\sigma \\ 0 & {\rm if} \; r \ge 2^{1/6}\sigma \end{array} \right. }
and the perturbation potential is given by (Eq, 5 Ref. 1):
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Phi_{\rm attractive} (r) = \left\{ \begin{array}{ll} -\epsilon & {\rm if} \; r < 2^{1/6}\sigma \\ \Phi_{\rm LJ}(r) & {\rm if} \; r \ge 2^{1/6}\sigma \end{array} \right. }
Ben-Amotz-Stell reformulation
Colloids
The repulsive component of the WCA decomposition has been used as a model for colloids [3].
References
- ↑ John D. Weeks, David Chandler and Hans C. Andersen "Role of Repulsive Forces in Determining the Equilibrium Structure of Simple Liquids", Journal of Chemical Physics 54 pp. 5237-5247 (1971)
- ↑ Dor Ben-Amotz and George Stell "Reformulation of Weeks-Chandler-Andersen Perturbation Theory Directly in Terms of a Hard-Sphere Reference System", Journal of Physical Chemistry B 108 pp. 6877-6882 (2004)
- ↑ L. Filion, R. Ni, D. Frenkel, and M. Dijkstra "Simulation of nucleation in almost hard-sphere colloids: The discrepancy between experiment and simulation persists", Journal of Chemical Physics 134 134901 (2011)