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Title: Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles

Abstract

The densities of methanol, ethanol, 1-propanol, 1-butanol and 1-hexanol were measured in aqueous solutions of sodium dodecylsulfate at 25/sup 0/C. The partial molar volumes of the alcohols at infinite dilution in the aqueous surfactants solutions were calculated and discussed using a mass-action model for the alcohol distribution between the aqueous and the micellar phase. The partial molar volumes of the alcohols in the aqueous and in the micellar phases, and the ratios between the binding constant and the aggregation number, were calculated. The partial molar volume for all the alcohols in micellar phase is 10 cm/sup 3/-mol/sup -1/ smaller than that in octane. This can be related to the strong hydrophilic interaction between the head groups of the alcohol and the micellized surfactant. From the extrapolated values of the distribution constant and the partial molar volumes in the aqueous and micellar phases, the standard partial molar volume of heptanol in micellar solutions was found to decrease with increasing surfactant concentration. The standard free energy of transfer of alcohols from water to micelles was rationalized in terms of hydrophilic and hydrophobic contributions. A model is proposed in which the empty space around each solute is assumed to be the same inmore » the gas and liquid phases, and is used to explain the behavior of micelles in the presence of amphiphilic solutes.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Universit di Palermo, Italy
OSTI Identifier:
6762507
Resource Type:
Journal Article
Journal Name:
J. Solution Chem.; (United States)
Additional Journal Information:
Journal Volume: 15:8
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BUTANOLS; BINDING ENERGY; ETHANOL; HEXANOLS; METHANOL; PENTANOLS; PROPANOLS; APPARENT MOLAL VOLUME; DENSITY; DISPLACEMENT FLUIDS; FREE ENERGY; MATHEMATICAL MODELS; MICELLAR SYSTEMS; ORGANIC SULFUR COMPOUNDS; PARTIAL MOLAL VOLUME; SODIUM SULFATES; SOLUBILITY; SURFACTANTS; ALCOHOLS; ALKALI METAL COMPOUNDS; ENERGY; FLUIDS; HYDROXY COMPOUNDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SODIUM COMPOUNDS; SULFATES; SULFUR COMPOUNDS; THERMODYNAMIC PROPERTIES; 400201* - Chemical & Physicochemical Properties

Citation Formats

DeLisi, R, Lizzio, A, Milioto, S, and Liveri, V T. Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles. United States: N. p., 1986. Web. doi:10.1007/BF00644596.
DeLisi, R, Lizzio, A, Milioto, S, & Liveri, V T. Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles. United States. https://doi.org/10.1007/BF00644596
DeLisi, R, Lizzio, A, Milioto, S, and Liveri, V T. 1986. "Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles". United States. https://doi.org/10.1007/BF00644596.
@article{osti_6762507,
title = {Binding constants and partial molar volumes of primary alcohols in sodium dodecylsulfate micelles},
author = {DeLisi, R and Lizzio, A and Milioto, S and Liveri, V T},
abstractNote = {The densities of methanol, ethanol, 1-propanol, 1-butanol and 1-hexanol were measured in aqueous solutions of sodium dodecylsulfate at 25/sup 0/C. The partial molar volumes of the alcohols at infinite dilution in the aqueous surfactants solutions were calculated and discussed using a mass-action model for the alcohol distribution between the aqueous and the micellar phase. The partial molar volumes of the alcohols in the aqueous and in the micellar phases, and the ratios between the binding constant and the aggregation number, were calculated. The partial molar volume for all the alcohols in micellar phase is 10 cm/sup 3/-mol/sup -1/ smaller than that in octane. This can be related to the strong hydrophilic interaction between the head groups of the alcohol and the micellized surfactant. From the extrapolated values of the distribution constant and the partial molar volumes in the aqueous and micellar phases, the standard partial molar volume of heptanol in micellar solutions was found to decrease with increasing surfactant concentration. The standard free energy of transfer of alcohols from water to micelles was rationalized in terms of hydrophilic and hydrophobic contributions. A model is proposed in which the empty space around each solute is assumed to be the same in the gas and liquid phases, and is used to explain the behavior of micelles in the presence of amphiphilic solutes.},
doi = {10.1007/BF00644596},
url = {https://www.osti.gov/biblio/6762507}, journal = {J. Solution Chem.; (United States)},
number = ,
volume = 15:8,
place = {United States},
year = {1986},
month = {8}
}