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FLUCTUATIONS IN AQUEOUS-SOLUTIONS OF SOME HYDROPHOBIC SOLUTES

TitleFLUCTUATIONS IN AQUEOUS-SOLUTIONS OF SOME HYDROPHOBIC SOLUTES
Publication TypeJournal Article
Year of Publication1995
AuthorsKoga, Y
JournalChemical Physics Letters
Volume240
Pagination340-344
Date PublishedJun
Type of ArticleArticle
ISBN Number0009-2614
Keywords2-BUTOXYETHANOL, 25-DEGREES-C, FREE-ENERGIES, HEAT-CAPACITIES, MIXING SCHEME, PARTIAL MOLAR ENTHALPIES, TERT-BUTANOL MIXTURES, TRANSITION, VOLUMES, WATER-RICH REGION
Abstract

The entropy fluctuation in liquids and solutions is most conveniently normalized to the coarse-grained volume. Hence, [(Delta S/V)(2)] = RC(p)/V-m(2) and [(Delta S/V)(Delta N/N)] = RT alpha(p)/V-m. It was shown to be useful if the response functions, C-p, kappa(T) and alpha(p), and the fluctuations derived from them, were discussed separately in contrasting the peculiar nature of liquid H2O against a typical van der Waals liquid, benzene. The composition dependence of these fluctuations was examined in aqueous solutions of typical hydrophobic solutes, 2-butoxyethanol, 2-butanone and tert-butanol. It was concluded that the above solutes reduce the hydrogen bond probability in H2O up to the crossover point of mixing scheme, x(i)(c).

URL<Go to ISI>://A1995RG42300015