文献类型：期刊文献

英文题名：Improving thermal conductivity and decreasing supercooling of paraffin phase change materials by n-octadecylamine-functionalized multi-walled carbon nanotubes

作者：Tang, Qianqiu[1];Sun, Jun[1];Yu, Shuangmin[1];Wang, Gengchao[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2014

卷号：4

期号：69

起止页码：36584

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20143618131371);WOS:【SCI-EXPANDED(收录号:WOS:000341363200025)】；

基金：This work was supported by National Natural Science Foundation of China (51173042), Shanghai Municipal Science and Technology Commission (12nm0504102), and Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Carboxylation - Phase change materials - Yarn - Paraffins - Multiwalled carbon nanotubes (MWCN) - Differential scanning calorimetry - Thermal conductivity - Nucleation

摘要：Improving thermal conductivity and decreasing supercooling are essential for the utilization of paraffin phase change materials (PCMs). In this work, n-octadecylamine-functionalized multi-walled carbon nanotubes (f-MWCNTs) are obtained through a simple method of carboxylation of the MWCNTs with mixed acids of H2SO4 and HNO3 and then salt-forming reaction with n-octadecylamine. The paraffin/f-MWCNTs (paraffin/f-MWCNTs) composite PCMs are fabricated by mixing paraffin with f-MWCNTs under ultrasonication at 70 degrees C. It is found that the f-MWCNTs are homogenously dispersed in a toluene or paraffin matrix due to the existence of long chain alkanes in f-MWCNTs. As a result, the thermal conductivity and heat transfer of the paraffin/f-MWCNTs composite PCMs are significantly enhanced. Moreover, differential scanning calorimetry (DSC) analysis indicates that the incorporation of f-MWCNTs reduces the supercooling of paraffin, mainly due to the well-dispersed f-MWCNTs serving as nuclei to promote the heterogeneous nucleation and crystallization process of paraffin.