沉淀转化法制备不同形状的氢氧化镍及氧化镍超微粉末的研究

A STUDY ON PREPARATION OF ULTRAFINE POWDERS OF Ni(OH) 2 AND NiO WITH DIFFERENT SHAPES BY PRECIPITATION TRANSFORMATION METHOD

本工作采用沉淀转化法制备了不同形状的氢氧化镍及氧化镍超微粉末，详细的研究了转化温度、沉淀转化剂及阻聚剂的浓度等实验参数对超微粉末组成和结构的影响。

Ultrafine powders of Ni(OH) 2 and NiO with different shapes were prepared by precipitation transformation method. The influence of transformation temperature and concentrations of transformation agent and anti agregative agent (a kind of surfactant tween 80) on phase composition and structure were studied in detail. The experimental results showed that, the precipitation transformation was not completed below 40℃, and the XRD determined results indicated two phases of Ni(OH) 2 and NiC 2O 4·H 2O coexisted. The precipitate was completely transformed when the transformation agent concentrations of NaOH is in the range of 0.1￣0.05 mol·L -1 , and the single phase Ni(OH) 2 ultrafine powder was obtained. But the particle size increased with lowering concentrations of NaOH or anti aggregative agent. The experimental results also showed that Ni(OH) 2 particles are in the shape of needles in the presence of NO 3 - anion or of thin pieces when no NO 3 - anion exists. The NiO ultrafine powder was obtained by calcining Ni(OH) 2 ultrafine powder.