Dynamics of ionic and hydrophobic solutes in water-methanol mixtures of varying composition

Chowdhuri, Snehasis ; Chandra, Amalendu (2005) Dynamics of ionic and hydrophobic solutes in water-methanol mixtures of varying composition Journal of Chemical Physics, 123 (23). 234501_1-234501_8. ISSN 1674-0068

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Official URL: http://link.aip.org/link/?JCPSA6/123/234501/1

Related URL: http://dx.doi.org/10.1063/1.2137702


We have carried out a series of molecular-dynamics simulations of water-methanol mixtures containing either an ionic or a neutral atomic solute to investigate the effects of composition of the mixture on the diffusion of these solutes. Altogether, we have considered 17 different systems of varying composition ranging from pure water to pure methanol. The diffusion coefficients of ionic solutes are found to show nonideal behavior with variation of composition of the solvent mixture. The extent of nonideality of the solute diffusion is found to be similar to the nonideality that is observed for the diffusion and orientational relaxation of water and methanol molecules in these mixtures and is attributed to the enhanced stability of the hydrogen bonds and formation of interspecies complexes in the mixtures. The neutral solute shows characteristics of hydrophobic solvation and its diffusion decreases monotonically with increase of methanol concentration. The present simulation results are compared with those of experiments wherever available.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Organic Compounds; Liquid Mixtures; Molecular Dynamics Method; Liquid Theory; Liquid Structure; Hydrogen Bonds; Diffusion; Solvation
ID Code:6173
Deposited On:19 Oct 2010 11:14
Last Modified:27 Jan 2011 08:44

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