Stability and thermal conductivity of water-based carbon nanotube nanofluids

作     者：Mansoor Farbod Ameneh Ahangarpour Seyed Gholamreza Etemad 

作者机构：Department of PhysicsShahid-Chamran University Department of Chemical EngineeringIsfahan University of Technology 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第5期

页      面：59-65页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Shahid-Chamran University of Ahvaz for the financial support of this work National Iranian South Oil Company(NISOC) for their help and assistance 

主　　题：Nanofluids Thermal conductivity Stability Carbon nanotubes Refluxing time 

摘      要：Water-based nanofluids were prepared with multi walled carbon nanotubes （MWCNTs） of different lengths in concentrations of 0,1,0,25 and 0,5 vol%, To improve their dispersibility, pristine MWCNTs were functionalized and cut into small lengths by reflux in an oxidizing mixture of 3：1 sulfuric and nitric acids, The initial length of the carbon nanotubes （CNTs; 10-15 μm） was reduced to 203, 171 and 134nm after 1, 2 and 4 h of reflux, respectively, Surface modification and the reduced length of the CNTs, improved the stability of the nanofluids with no significant sedimentation observed after 80 days. Furthermore, the thermal conductivities of nanofluids prepared using refluxed CNTs, were higher than that of the pristine CNTs. The thermal conductivity also increased with the nanofluid temperature, The nanofluid prepared with 1 h refluxed CNTs had the highest thermal conductivity, The enhanced thermal conductivity and stabilitv of the nanofluids was attributed to the decreased length of CNTs.