Dispersion Behavior of CuO/H_2O Nanofluid

CuO/H2O nanofluid was prepared by adding CuO nanoparticles into water,which is a new kind of heat transfer fluid.Based on the measurement of zeta potential,particle size,absorbancy of CuO nanoparticles,the influences of supersonic time,surfactant kinds and concentration,and pH value on the dispersion of CuO/H2O suspension were systematically studied by using such surfactants as ionic polyethylene glycol 6000(PEG6000),non-ionic sodium dodecyl benzene sulfonate(SDBS).The results show that the dispersion of CuO/H2O suspension firstly increases to a maximum and then decreases with the increase of ultrasonic time.It is the same with the increase of surfactant concentration and pH value.The dispersion of CuO nanoparticles exists an optimal ultrasonic dispersion time,dispersing agent concentration and pH value.SDBS is the better dispersant agent among the two kinds of surfactants used in the experiment.The optimal ultrasonic time is 1.5 h the dispersing concentration is 0.06% in mass percent of SDBS and the pH value is 8.