par Hommelen, Jacques 
Référence Journal of Colloid Science, 14, 4, page (385-400)
Publication Publié, 1959-08
Référence Journal of Colloid Science, 14, 4, page (385-400)
Publication Publié, 1959-08
Article révisé par les pairs
| Résumé : | The surface tensions of aqueous solutions of long-chain alcohols and acids measured by the usual techniques are shown to be high by a significant amount owing to solute evaporation during the measurement. If the ring or vertical plate method is used, only measurements in a closed vessel give equilibrium values; if the hanging drop is used, the heavy vapors do not remain near the drop, and it is therefore essential to form the drop very close to the surface of the solution which is saturating the surrounding air. Improvements in normal procedures, designed to eliminate the evaporational error, are described. Various anomalies, for example, the "bag effect" found by Addison and Hutchinson with decyl alcohol solutions, and the minimum in the time curves of surface tension observed by Ward and Ottman with capric acid solutions, are shown to be consistent with an evaporational effect. New surface tension-concentration curves for aqueous solutions of some alcohols and acids are given in the present paper. The corresponding adsorption values have been deduced from the Gibbs equation. © 1959. |
