Title: Molecular dynamics simulations of the properties of water-methanol mixtures. Effects of force fields
Author(s):

	M. Cruz Sanchez (Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, 04510 Cd. de México, México) ,
	H. Dominguez (Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior, 04510 Cd. de México, México) ,
	O. Pizio (Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, 04510 Cd. de México, México)

Isothermal-isobaric molecular dynamics simulations are used to examine the microscopic structure and some properties of water-methanol liquid mixture. The TIP4P/2005 and SPC/E water models are combined with the united atom TraPPE and the all-atom force field model for methanol. Our principal focus is to evaluate the quality of predictions of different combinations of model force fields concerning the composition dependence of basic properties of this system. Specifically, we explored the composition effects on density, excess molar volume and excess entropy, as well as on the surface tension and static dielectric constant. In addition, the structural properties are described in terms of the coordination numbers and the average number of hydrogen bonds between molecules of constituent species. Finally, the composition dependence of self-diffusion coefficients of the species is evaluated. All theoretical predictions are tested with respect to experimental data.

Key words: water-methanol mixtures, mixing properties, surface tension, molecular dynamics simulations
PACS: 61.20.-p, 61.20-Gy, 61.20.Ja

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