| Title |
Variation of the Electrokinetic Potential and Surface Energy Profile of a Binary Mixture Dispersion with Mixing Ratio |
| Authors |
김희진 ( Hee Jin Kim ) ; 정혜원 ( Hye Won Jeong ) ; 김동수 ( Dong Su Kim ) |
| Keywords |
Mixed colloidal dispersions; Total interaction energy; Turbidity; Zeta potential |
| Abstract |
Different colloidal particles generally co-exist in the water and wastewater. Thus, there needs to identify practical electrokinetic characteristics of the particles, comparing with the case when each colloidal material is independently distributed. In this study, changes of overall zeta potential was examined through mixed dispersions of TiO2 and MnO2. The mixing ratios were classified into 3-type in order to distinguish the effects of the proportions of each particle from those of total concentration in colloidal suspensions. The types are single colloidal dispersions of TiO2 and MnO2 (1:0, 0:1), mixed dispersions at different ratios (0.75:0.25, 0.5:0.5, 0.25:0.75), and a mixed dispersion with doubled concentration (1:1), respectively. It showed that the overall variation of zeta potential as a function of pH was intensified in a colloidal dispersion with the ratio of 1:1. It was concerned that the double action of ion would contribute to this result. On the one hand, the zeta potentials of each colloidal dispersion commonly decreased at the state of strong acid and base under the influence of compression of the electric double layer. The changing patterns were also considered through calculating total interaction energy between colloidal particles based on DLVO theory and measuring turbidity of the colloidal dispersions. |