使用氨水溶解硫酸铜，加入氢氧化钡沉淀分离硫酸根，所得铜氨清液加热蒸氨得氢氧化铜超细沉淀．沉淀分别用氨水和无水乙醇洗涤，60℃干燥，放置干燥器中至恒重．XRD、TEM、IcP测定表明，其平均粒径尺寸为45 nm，粒度分布范围窄，纯度高．用高精密全自动量热仪在78～370 K温区测定了热容，拟合出热容随温度变化的多项式方程，并对此氨浸新工艺--均匀沉淀法和有关的热力学性质进行了讨论．%The Cu(OH) 2 nanometric powders were prepared by a new method of homogeneous precipitation.The CuSO4 was dissolved in ammonia and the SO42- was removed by adding Ba(OH)2. The filtrate was heatedto remove ammonia and the Cu(OH) 2 was homogeneously deposited. The deposition was washed by ammoniaand ethanol, and the product was dried at 60 ℃, and then put in a desiccator to keep constant weight. Thegained powders were examined by XRD, TEM and ICP techniques and the results show that the grain size ofCu(OH) 2 nanometric powders is 45 nm in average within a narrow distribution range, and the powders arehighly purified. The heat capacity of the powders was measured in the temperature range of 78 ～ 370 K, andthe polynomial equations expressing the change of heat capacity with temperature was fitted. The ammonialeach techniques and thermodynamic properties were discussed.
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