|
|||||
|
|
High thermal conductivity of polyethylene nanowire arrays fabricated by an improved nanoporous template wetting technique |
|
| Authors: | Bing-Yang Cao Yuan-Wei Li Heng Chen Kai-Leung Yung An Cai |
| Affiliation: | a Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, PR China b Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi’an 710072, PR China c Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China d Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China |
| Abstract: | Generally polymer bulk structures and nanostructures are thermally insulative. In this study, we show that an improved nanoporous template wetting technique can prepare thermally conductive polymer nanowire arrays. The thermal conductivities of the fabricated high-density polyethylene (HDPE) nanowire arrays with diameters of 100 nm and 200 nm, measured by a laser flash method, are about 2 orders of magnitude higher than their bulk counterparts. The estimated thermal conductivity of a single HDPE nanowire is as high as 26.5 W/mK at room temperature. The high orientation of chains of the HDPE nanowires may arise from the integrative effects of shear rate, vibrational perturbation, translocation, nanoconfinement and crystallization. Findings in this study provide useful strategies on enhancing the intrinsic thermal properties of polymer nanostructures. |
| Keywords: | Polymer nanowire array Thermal conductivity Nanoporous template wetting |
| 本文献已被 ScienceDirect 等数据库收录！ | |