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Influence of SDBS on stability of Al2O3 nano-suspensions

In this paper, the stability of Al2O3 nano-particles in water were investigated at different pH values and different concentration of sodium dodecylbenzenesulfonate (SDBS) dispersant by measurement of the zeta potential and absorbency. The experimental results show that zeta potential is relation with absorbency, and the higher magnitude of zeta potential corresponds to the higher absorbency, and the better dispersion and good stability of the Al2O3-H2O nano-suspensions. It is also found that the concentration of SDBS can significantly affect the value of zeta potential and absorbency. The experimental results show that for SDBS there is an optimizing concentration in the nanofluids which can induce high zeta potential and high absorbency, and that in 0.1% Al2O3 -H2O nano-suspensions the optimizing concentration of SDBS is 0.09%, which has the best disperse results of the nanofluids.