WANG Jianrong， WANG Hanwen， DUAN Guangbin

(School of Material Science and Engineering, University of Jinan, Jinan 250022， China)

Abstract: 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 and1 ∶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 diffraction 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.

Keywords: Ag-TiO2 nano-particle; nano-particle suspension; stability; thermal conductivity; viscosity

文章编号：1008-5548(2020)02-0035-06

DOI:10.13732/j.issn.1008-5548.2020.02.006

收稿日期:2019-07-03,修回日期:2019-10-10，在线出版时间：2019-12-30 10:11。

基金项目:山东省自然科华基金项目，维号:ZR20160L004。

第一作者筒介:王建荣(1966-).女，高级实验师，研究方向为纳米粉体材料，E-msil:mse_wangirn.edhu.cn。

中图分类号：TB333                             文献标志码：A