纳米氧化铜粉的合成

Synthesis of CuO Nano Powder

以Cu(NO_3)_2为原料,NaOH为沉淀剂,蒸馏水为溶剂,采用化学沉淀法结合超声场作用制备出了纳米氧化铜颗粒。经XRD、TEM、差热扫描分析(DSC)以及粒度分析仪检测,所获得颗粒平均粒度达到55nm。此方法制备的氧化铜颗粒形状规则、粒度分布范围窄、纯度高。同时探讨了超声场作用下的机理以及对制备工艺过程和最终产物的影响。讨论了溶液的pH值、反应物的浓度、表面活性剂、反应温度和反应时间对颗粒尺寸的影响。在探讨如何保持纳米颗粒的分散性方面,采用了多种表面活性剂进行试验,发现聚乙二醇(6000)对纳米氧化铜颗粒的保存有着显著的效果,静置20天几乎看不到任何沉降现象。

CuO nano-particles are prepared by a new method which involves homogeneous precipitation in high intensity ultrasonic field, using Cu（NO3 ）2 and NaOH as the starting materials and pure water as the solvent. The CuO nano-particles are characterized by using techniques such as X-ray powder diffraction, transmission electron microscopy and differential thermal scan analysis, and tested by separator-size analyzer. The CuO particles with an average size of 55nm are successfully prepared. The as-prepared CuO nano-particles have regular shape, narrow size distribution and high purity. In this experiment, the mechanism and effects of conditions of treatment on the process of ultrasonic field final products are discussed. The influences of the pH values, consistency of reactant, surface-active reagent, the time and the temperature on the particles size are also discussed. How to preserve the nano-particles is significant. In this thesis, some different surface-active reagents are used. It＇s found the PAG-6000 has a great influence on the dispersion of nano-particles. Under the condition, there isn＇t any sedimentation phenomenon in 20 days.