Citation: GU Shao-Nan, LI Wen-Jun, LUO Wen-Li, CHANG Zhi-Dong, ZHOU Hua-Lei. Hydrophobic ZnO: Low Temperature Complex-Precipitate Synthesis and Application in Improving Foam Stability[J]. Chinese Journal of Inorganic Chemistry, ;2015, (3): 594-602. doi: 10.11862/CJIC.2015.069
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Using Zn(NO3)2·6H2O as raw material, 25% ammonia as complexing agent and NaOH as precipitant, ZnO micro-spheres were synthesized by low temperature complex-precipitate(LTCP) method. The species distribution in the system was also analyzed. XRD and SEM were employed to characterize ZnO samples. The SEM images demonstrate that the uniform micro-spheres are about 2 μm. The morphology of the samples appears as micro-rods and as irregular polyhedrons without addition of NaOH or ammonia. ZnO micro-spheres were hydrophobically modified by varies amounts of cetyltrimethylammonium bromide(CTAB) in order to obtain different contact angles. Meanwhile, the process for surfactant molecules absorption on ZnO micro-spheres surface was discussed. The results of foam stability reveal that 0.03wt% ZnO micro-sphere with surface contact angle of 52.9° makes the greatest contribution to improving the stability of foams.
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