摘要
为了提高Ti()2纳米流体的导热性能,将Ag纳米颗粒与TiO2纳米颗粒混合,利用两步法制备出不同银钛物质的量比的Ag-TiO2纳米悬浮液,并研究其导热性能与黏性。采用X射线衍射仪和扫描电子显微镜表征Ag-TiO2纳米颗粒晶型和形貌;通过沉降法、激光粒度分析和吸光度测量法探究Ag-TiO2纳米悬浮液的稳定性。结果表明:Ag纳米颗粒含量低有利于Ag-TiO2纳米悬浮液稳定;质量分数为0.3%的银钛物质的量的比为1:6、1:4、1:2的Ag-TiO2悬浮液,导热系数在常温下比Ti()2悬浮液导热系数分别增加了0.83%,1.66%,2.33%,而黏度与基液水相比分别增加了37.5%、27.5%、22.5%;银钛物质的量比为1:2的Ag-TiO2纳米悬浮液导热系数高于银钛物质的量比为1:6和1:4悬浮液的,而其黏度却低于银钛物质的量比为1:6和1:4悬浮液的。
In order to improve the thermal conductivity of TiO2 nano-fluids,three kinds of silver-titanium dioxide(Ag-TiO2)nano-particle suspension with 1-6,1-4 andl:2 mole ratios of Ag:Ti were prepared using two-step method.The characterization of Ag-TiO2 nano-particle was confirmed by XRD and SEM.The stability of nano-particle suspension was described by the gravity sedimentation,laser difiraction particle size analyzer and absorbance measurement.The result shows that the relatively lower mole contents of Ag nano-particles in Ag-TiO2 nano-suspension have better stability.The thermal conductivity and viscosity of three kinds of Ag-TiO2 nano-particle suspensions were experimentally investigated.It is found that the thermal conductivities with 1•6,1•4 and 1:2 mole ratios of Ag:Ti are increased by 0.83%,1.66%and 2.33%respectively compared with that of TiO2 suspension at room temperature for mass fraction of 0.3%,while the viscosity increased by 37.5%,27.5%and 22.5%respectively compared with that of water.The thermal conductivity of Ag-TiO2 nanoparticle suspensions with 1:2 molar ratio of silver-titanium dioxide is higher than that of the suspensions with 1:6 and 1:4 molar ratios.Inversely,the viscosity is lower than that of the suspensions with 1:6 and 1:4 molar ratios.
作者
王建荣
王涵文
段广彬
WANG Jianrong;WANG Hanwen;DUAN Guangbin(School of Material Science and Engineering,University of Jinan,Jinan 250022,China)
出处
《中国粉体技术》
CAS
CSCD
2020年第2期35-40,共6页
China Powder Science and Technology
基金
山东省自然科学基金项目，编号:ZR2016QL004
关键词
Ag-TiO2纳米颗粒
悬浮液
稳定性
导热性能
黏度
Ag-TiO2 nano-particle
nano-particle suspension
stability
thermal conductivity
viscosity
