Effects of the dispersion of polymer wrapped two neighbouring single walled carbon nanotubes (SWNTs) on nanoengineering load transfer
Effects of the dispersion of polymer wrapped two neighbouring single walled carbon nanotubes (SWNTs) on nanoengineering load transfer
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DOI：
10.1016/j.compositesb.2012.09.079
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发表时间：
2013-02
影响因子：
13.1
通讯作者：
Yancheng Zhang;Junhua Zhao;Ning Wei;Jinwei Jiang;Y. Gong;T. Rabczuk
中科院分区：
文献类型：
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作者：
Yancheng Zhang;Junhua Zhao;Ning Wei;Jinwei Jiang;Y. Gong;T. Rabczuk
采用分子动力学模拟方法研究了聚合物包覆两个相邻单壁纳米管（SWNTs）的分散性对其载荷传递的影响。系统地研究了单壁碳纳米管的位置、聚合物链长和温度对相邻两个单壁碳纳米管之间相互作用力的影响。模拟结果表明：（1）在有无聚合物存在的情况下，色散角决定了单壁碳纳米管在拉伸过程中的振幅和相互作用力的演化。(2)碳链长度对两个单壁碳纳米管之间的相互作用力没有影响，这就是所谓的“力增强点”。聚合物的增强的载荷效应发生在载荷位移越过该点之后。(3)温度对最大拔出力的影响较小，而温度的升高使拔出力大大降低。(4)在详细分析分离过程的基础上，发现了系统的自修复功能，为理解声子器件中单壁碳纳米管色散的负载转移提供了指导。
The influence of polymer wrapped two neighbouring single-walled nanotubes’ (SWNTs) dispersion on their load transfer is investigated by molecular dynamics (MD) simulations. The influence of the SWNTs’ position, the polymer chain length and the temperature on the interaction force between the two neighbouring SWNTs are systematically studied. There are four main findings from our simulations: (1) The dispersion angle dominates the amplitude and the interaction force evolution with or without polymer during the pulling process of two SWNTs. (2) The chain length does not affect the two SWNTs’ interaction force within a short separation distance, the so called “Force enhancing point”. The enhanced load effect of the polymer takes place after the load displacement goes across this point. (3) The temperature has a minor influence on the maximum pull force, while the increased temperature greatly decreases the pullout energy. (4) Based on the detailed analysis of the separation process, the self-repairing function of the system is found. The present results provide a guidance for understanding the load transfer of SWNT dispersion in phononic devices.