Identity, energetics, dynamics and environment of interfacial water molecules in a micellar solution

Pal, Subrata and Balasubramanian, Sundaram and Bagchi, Biman (2003) Identity, energetics, dynamics and environment of interfacial water molecules in a micellar solution. In: Abstracts of Papers - American Chemical Society, National Meeting, 225 (part 2). U486-U486.

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Abstract

The structure and energetics of interfacial water molecules in the aqueous micelle of cesium perfluorooctanoate have been investigated, using large-scale atomistic molecular dynamics simulations, with the primary objective of classifying them. The simulations show that the water molecules at the interface fall into two broad classes: bound and free, present in a ratio of 9:1. The bound water molecules can be further categorized on the basis of the number of hydrogen bonds (one or two) that they form with the surfactant headgroups. The hydrogen bonds of the doubly hydrogen-bonded species are found to be, on the average, slightly weaker than those in the singly bonded species. The environment around interfacial water molecules is more ordered than that in the bulk. The surface water molecules have substantially lower potential energy, because of interaction with the micelle. In particular, both forms of bound water have energies that are lower by �2.5-4.0 kcal/ mol. Entropy is found to play an important role in determining the relative concentration of the species.

Item Type:	Journal Article
Publication:	Abstracts of Papers - American Chemical Society, National Meeting
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	17 Oct 2011 10:31
Last Modified:	21 Oct 2011 08:30
URI:	http://eprints.iisc.ac.in/id/eprint/40115

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