Cu/Al纳米流体的制备及导热性能  

Preparation and thermal conducting performance of Cu/Al nanofluids

作　　者：汪靖凯 赵蕾[1] 马丽斯[2] WANG Jing-kai;ZHAO Lei;MA Li-si(School of Building Services Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Department of Basic Sciences,Air Force Engineering University,Xi’an 710051,China)

机构地区：[1]西安建筑科技大学建筑设备科学与工程学院,陕西西安710055 [2]空军工程大学基础部,陕西西安710051

出　　处：《应用化工》2021年第3期620-624,629,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(51878535);国家科技部科技支撑计划项目(2014BAJ01B01)。

摘　　要：以柠檬酸钠和β-糊精为稳定剂、以抗坏血酸为还原剂,采用化学还原法制备Cu/Al复合纳米粒子,以水-乙二醇为基液,制备不同质量分数的Cu/Al复合纳米流体。利用XRD、SEM、TEM对Cu/Al复合纳米粒子的相结构和微观形貌进行表征,采用紫外-可见分光光度计和热物性分析仪测试Cu/Al复合粒子纳米流体的稳定性和导热性;研究了不同铜盐前驱体、不同浓度的铜盐对Cu/Al复合纳米相结构和形貌的影响;研究了分散剂种类及纳米粒子添加量对纳米流体稳定性和导热性影响。结果表明,以醋酸铜为前驱体,采用还原法制备的Cu/Al纳米复合粒子具有核壳结构,大小均匀,粒径约为50 nm;以柠檬酸钠为稳定剂,质量百分数为0.1%,0.3%,0.5%复合Cu/Al纳米流体均具有良好的分散稳定性;纳米流体的导热系数随着添加物用量增加而提高,当Cu/Al纳米复合粉体的质量分数为0.5%时,室温下纳米流体的导热系数相对于基液可提高39.6%。Cu/Al nanoparticle has been prepared by displacement method using sodium citrate,β-dextrin as stabilizer and vitamin C as reductant.Cu/Al nanofluids based on DI-water/ethylene glycol with different mass fraction nanoparticles were prepared,further.The microstructure and morphology of the Cu/Al nanoparticle were investigated by XRD,SEM and TEM.The stability of nanofluids was test using light absorption method and the thermal property analyzer was used to measure the thermal conductivity of nanofluids.The effects of copper salt precursor and concentration on the phase structure and micromorphology of Cu/Al nanoparticle,the effects of dispersant type and different mass fraction nanoparticles on the stability and thermal property were studied.The results show that this method can prepare a uniform core-shell Cu/Al nanoparticle using cupricacetate as precursor with 50 nm of size,the Cu/Al nanofulids had excellent dispersion stability with the mass concentration of 0.1%,0.3%,0.5%.The heat transfer coefficients of hybrid nanofluids increase with the increase of nanoparticle mass fraction.The largest growth rate of the heat transfer coefficients runs up to 39.6%at a mass faction of 0.5%compared with the results of base fluid.

关 键 词：Cu/Al核壳结构 纳米流体 制备 导热 

分 类 号：TQ016.1[化学工程]