湿化学法制备ZnO纳米流体

ZnO Nanofluid Synthesized Through Wet Chemical Method

采用湿化学法成功制备了氧化锌（ZnO）纳米流体。用X射线衍射仪（XRD）、透射电子显微镜（TEM）对ZnO纳米颗粒的成分、分散性、形貌和粒径进行了分析表征；研究了醇水比（丙二醇（PG）／水）、乙酸锌浓度、反应时间、分散剂等因素对纳米流体分散稳定性和ZnO粒径的影响。结果表明，以乙酸锌（（CH3COO）2Zn·2H2O）为锌源，以氢氧化钠（NaOH）为碱源，V（丙二醇）：V（水）=3：2，乙酸锌浓度为0．1mol·L^-1，反应时间0．5h，聚乙二醇2000（PEG2000）加入1％（m（PEG2000）／m（乙酸锌）=1％）时为最佳工艺条件，产物氧化锌颗粒大小在20～30nm，分散性好，解决了团聚问题，可以稳定较长时间。

ZnO nanofluids were prepared successfully through wet chemical method. The composition, dispersibility, morphology and particle size of ZnO nanoparticles were characterized by XRD and TEM. The influences of synthesis parameters, such as propylene glyeol/water（PG/water） ratio, concentration of [（CH3COO）2Zn ·2H2O], reaction time and dispersant on the particle size of ZnO and stability of the nanofluids were studied. The results show that the optimum synthesis conditions include the following aspects. [（CH3COO）2Zn· 2H2O] and NaOH are chosen to be the zinc source and the alkali source respectively, the ratio of PG to water is 3 ： 2, the concentration of [（CH3COO）2Zn · 2H2O] is 0.1 mol · L ^-1, the reaction time is 0.5 h, and PEG fraction is 1 %. ZnO particles synthesized under the optimum conditions are 20-30 nm in size with high dispersibility and stability.