Preparation Of Copper Nanoparticles By Hydrazine Hydrate Liquid Phase Reduction Method

Copper nanoparticles, which have small size effect, can be produced lubricant, catalyst, conductive pulp. In addition, Cu-H2O nanofluids, as a kind of new-type heat transfer medium in heat exchange field, can improve the heat transfer efficiency of heat exchange equipment effectively. Therefore, study of preparation of copper nanoparticles, prepared by reducing bluevitriod with hydrazine hydrate, is carried out in this work.The preparation process of copper nanoparticles in this work was that a copper sulfate solution with a certain concentration, was complexed by EDTA and then reduced by hydrazine hydrate. Solution pH value was adjusted by dropping NaOH aqueous solution. In order to obtain nanoparticles with good dispersion and small size, the variation scope of relevant parameters were determined by a series of single-factor experiments, respectively. The factors included experimental process environment level, reaction solution concentration, reaction time, solution pH value, stirring speed and dispersant dosage. Then,16 sets of experiments were carried out based on the the orthogonal experiment table, which was designed by orthogonal experiment design rules and the range of parameters value. At last, the optimum experimental program was determined by comparing each experimental results. Under this program, scattered and homogenous copper nanoparticles with the grain size of about 60nm-80nm, were obtained after adding dispersant PVP.The morphology and grain size of copper nanoparticles, prepared under different reaction conditions, were analyzed by scanning electron microscope. The Copper nanoparticles, treated by corrosion inhibitor benzotriazole and tetrabutyl titanate coupling agent, can save 30 days without oxidation in air. Antioxidant properties of copper nanoparticles was increased significantly, which were characterized by XRD.