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Información tecnológica

versión On-line ISSN 0718-0764


PAEZ, Manuel S; VILLEGAS, Efraín E  y  ALVIS, Armando. Surface Properties of Aqueous Dilute Solutions of Alcohols with Three Carbons. Inf. tecnol. [online]. 2009, vol.20, n.1, pp. 83-90. ISSN 0718-0764.

Surface tension of diluted aqueous solutions of mono and polyhydroxilic alcohols was determined at various temperatures using the method of capillary rising. The experimental data were used to evaluate surface entropies, enthalpies, and concentration, binding constants and the limiting slope. The effect of temperature, of the alkyl chain size and of the position of the hydroxyl groups in the solute that were exposed to the solvent are analyzed. The results show that the surface tension of the solutions varies lineally with the temperature and that the hydrophobic character of these solutes rises according to the order: 123PT, 13PD, 12PD y 1P. Additionally, bond breaking processes of the hydration spheres (positive enthalpies) and molecular disorder increase (positive entropies) in the surface region were detected.

Palabras clave : surface tension; hydrophobicity; binding constants; polyols.

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