par Dumont, Freddy ;Warlus, Jean ;Watillon, André
Référence Journal of colloid and interface science, 138, 2, page (543-554)
Publication Publié, 1990-09
Article révisé par les pairs
Résumé : Several TiO2 hydrosols with point of zero charge (pzc) ranging from 2.8 to 6 were prepared depending on the method of synthesis. The ionic adsorption sequences at the different interfaces were deduced from the critical coagulation concentrations of the corresponding hydrosols. The general behavior can be summarized as follows: on positively charged surfaces, the structure-maker anions are always more adsorbed than the structure-breakers; on negatively charged surfaces, for "high pzc" hydrosols, the cationic sequence is the same as that observed for the anions, whereas, for "low pzc" hydrosols, the reverse sequence is found. The model based on the generalization to the ion-surface interactions of the Gurney concept of the ion-ion interactions, as proposed by Gierst, is used to explain the observed properties of the different hydrosols. © 1990.