Resumen

PAEZ, Manuel S; BORJA, Gustavo J  y  ALVIS, Armando. Surface Tension of Dilute Aqueous Solutions of Pentanediol Isomers at 283.15 K. Inf. tecnol. [online]. 2009, vol.20, n.2, pp.47-53. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642009000200007.

The effect of the position of OH groups on the surface tension of pentanodiol isomers is studied. Surface tension at 283.15 K of aqueous solutions of 1,2-pentanediol (12PD), 2,4-pentanediol (24PD), 1,4-pentanediol (14PD) and 1,5-pentanediol (15PD) were measured as a function of the concentration using the method of capillary rise, especially in the diluted region. The binding site constant is evaluated using the model proposed by Connors for liquid solutes and the activity coefficients for infinite dilution according to the procedure suggested by Gracia-Fadrique. The results show the dependence of the surface tension with the relative position of the hydroxylic groups in the solute molecule and with the size of the alquilic chain exposed  to the solvent.

Palabras clave : surface tension; pentanediol isomers; binding sites; activity coefficients.