Synergistic Effect of Mixed Surfactants on the Dispersion Stability of CeO2 Nanoparticles

The synergistic effect of the mixture of CTAB cationic (or SDBS anionic) and Tween 80 nonionic surfactants on dispersion stability of CeO2 nanoparticles in water solutions was studied by the Zeta potential, adsorption isotherm and settling experiment. The results show that in different mixed surfactant systems, nanoparticles have different surface electrical properties, by which the dispersion stability are affected. nanoparticles have good adsorption property for both two kinds of surfactant mixtures, but the adsorption isotherm shapes are different. Under the alkalescent condition, the dispersion stability of CeO2 nanoparticles in mixed surfactant systems is improved markedly compared with in no surfactant-free system, and synergistic effect of mixture of Tween 80 and SDBS is more remarkable than the other one.