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Fluctuations in aqueous methanol, ethanol, and propan-1-ol: amplitude and wavelength of fluctuation

TitleFluctuations in aqueous methanol, ethanol, and propan-1-ol: amplitude and wavelength of fluctuation
Publication TypeJournal Article
Year of Publication1999
AuthorsKoga, Y
JournalCanadian Journal of Chemistry-Revue Canadienne De Chimie
Volume77
Pagination2039-2045
Date PublishedDec
Type of ArticleArticle
ISBN Number0008-4042
Keywords25-DEGREES-C, and propan-1-ol, aqueous methanol, ETHANOL, fluctuation density, HEAT-CAPACITIES, LIQUID WATER, N-ALCOHOL MIXTURES, NON-ELECTROLYTES, normalized fluctuation, partial molar fluctuations of alcohol, THERMODYNAMICS, VOLUMES
Abstract

Density, heat capacity, and isentropic compressibility data for aqueous methanol, ethanol, and propan-1-ol by Benson’s group were used to evaluate two kinds of fluctuations; mean-square fluctuation densities; and (mean-square) normalized fluctuations, respectively, in volume, entropy, and cross (entropy/volume) effect. The mean-square fluctuation densities provide measures for the amplitude (intensity) of the fluctuation, while the normalized fluctuations contain information regarding the wavelength (extensity) of the fluctuation. Furthermore, their composition derivatives, the partial molar fluctuations of alcohols were calculated. These quantities signify the effect of additional solute on the respective fluctuations. These data were interpreted in terms of mixing schemes learned earlier in this laboratory by using the data of excess partial molar enthalpy, entropy, and volume, and the respective alcohol-alcohol interaction functions, i.e., the composition derivatives of partial molar quantities.

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