Correlation between surface and bulk structures of alcohol–water mixtures

Adsorption isotherms of binary aqueous solutions of methanol, ethanol, 1-propanol, 2-propanol, tert-butanol, and 1-butanol are demonstrated, being calculated by using the Gibbs adsorption equation with experimental data of surface tension and vapor pressure found in the literature. For all of the al...

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Bibliographic Details
Published in:Journal of colloid and interface science 2005-04, Vol.284 (1), p.255-259
Main Author: Yano, Yohko F.
Format: Article
Language:English
Subjects:
Activity
Adsorption isotherm
Alcohol–water mixtures
Chemistry
Exact sciences and technology
General and physical chemistry
Gibbs adsorption equation
Hydrophobic hydration
Monolayer
Partial molar volume
Solution properties
Solutions
Surface excess
Surface physical chemistry
Surface structure
Surface tension
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Summary:Adsorption isotherms of binary aqueous solutions of methanol, ethanol, 1-propanol, 2-propanol, tert-butanol, and 1-butanol are demonstrated, being calculated by using the Gibbs adsorption equation with experimental data of surface tension and vapor pressure found in the literature. For all of the alcohol–water mixtures, the maximum value in the adsorption isotherm, namely, the maximum surface excess is about that expected for the formation of a monolayer. Furthermore, the composition of the mixture for the maximum surface excess coincides with that corresponding to the minimum in the excess partial molar volume of the solutes. These results indicate that the hydrophobic hydration in bulk induces the surface excess of the alcohols and after a monolayer is formed, the hydrophobic hydration itself is no longer retained.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2004.09.059