par Amhamdi, Hassan;Dumont, Freddy 
;Buess Herman, Claudine
Référence Colloids and surfaces. A, Physicochemical and engineering aspects, 125, page (1-3)
Publication Publié, 1997
;Buess Herman, Claudine Référence Colloids and surfaces. A, Physicochemical and engineering aspects, 125, page (1-3)
Publication Publié, 1997
Article révisé par les pairs
| Résumé : | The effect of urea on the stability of α-haematite hydrosols was studied in the presence of various monovalents ions on each side of the point of zero charge (PZC) (pH 8.2). It was observed that for pHs lower than the PZC, the presence of urea stabilizes the hydrosols by increasing the critical coagulation concentration values for all anions used in this study. However, for pHs higher than the PZC, an inversion of the cationic adsorption sequence was observed. This behaviour is in agreement with the well known action of urea on the structure of water and also with the general properties of the α-haematite water/interface. |
