多壁碳纳米管对正十八烷相变性能的影响  

Effects of MWNTs on the phase change properties of n-octadecane

作　　者：苏俊敏[1] 张兴祥[1] 孟庆杰[1] 吴世臻[2] 

机构地区：[1]天津工业大学改性与功能纤维天津市重点实验室,天津300160 [2]天津工业大学材料化工学院,天津300160

出　　处：《化工新型材料》2008年第8期62-65,共4页New Chemical Materials

基　　金：天津市科技发展计划项目(06TXTJJC14400)

摘　　要：采用几种不同类型的多壁碳纳米管与正十八烷混合,从官能团种类、多壁碳纳米管的直径和长度及含量等多方面来考察多壁碳纳米管对正十八烷相变性能的影响。实验中将高导热系数的多壁碳纳米管添加入正十八烷中后,混合物的相变温度变化不大,而热焓效率明显降低,且多壁碳纳米管含量越高,热焓效率降低幅度越大。当多壁碳纳米管的含量相同时,含有官能团化多壁碳纳米管的正十八烷的热焓效率低于常规多壁碳纳米管体系。并且混合物的热焓效率随多壁碳纳米管直径的降低迅速下降,而多壁碳纳米管的长度对热焓效率影响不大。结果表明,多壁碳纳米管表面对于正十八烷的吸附是造成热焓效率下降的主要原因。The effects of different types and various contents of multi-walled carbon nanotubes （MWNTs） on the phase change properties of n-octadecane were investigated. After adding the high thermal conductivity MWNTs to n-octadecane, the efficiency of enthalpy of the mixture decreased. In addition, with the increase of the contents of MWNTs, the efficiency of entbalpy decreased quickly. The effects of hydroxyl MWNTs and carboxyl MWNTs on efficiency of entbalpy were higher than that of MWNTs with the same contents. The diameter of MWNTs had higher effects on the efficiency of entbalpy. By contrast, the length of MWNTs had less effect on the efficiency of enthalpy. The experimental results showed that n-octadecane was mainly attached on the surface of MWNTs.

关 键 词：多壁碳纳米管 正十八烷 相变性能 热焓效率 

分 类 号：O623.11[理学—有机化学]