New approach to model the buckling and stable length of multi walled carbon nanotube probes near graphite sheets
New approach to model the buckling and stable length of multi walled carbon nanotube probes near graphite sheets
复制标题
DOI：
10.1016/j.matdes.2010.08.002
复制
发表时间：
2011-05
影响因子：
8.4
通讯作者：
A. Koochi;A. Kazemi;A. Noghrehabadi;A. Yekrangi;M. Abadyan
中科院分区：
文献类型：
--
作者：
A. Koochi;A. Kazemi;A. Noghrehabadi;A. Yekrangi;M. Abadyan
通过两种解析近似方法和一种数值方法，首次对多壁碳纳米管（MWCNT）探针/致动器在薄石墨和厚石墨附近的屈曲进行了建模。采用基于Lennard-Jones势的混合纳米尺度连续介质模型模拟了多壁碳纳米管的分子间力致偏转。计算了多壁碳纳米管尖端偏转和多壁碳纳米管-石墨吸引力在不稳定性开始时的临界值。此外，最小纳米管-石墨初始间隙和独立CNT的稳定长度被确定为工程应用和纳米器件设计的基本参数。多壁碳纳米管的稳定长度被确定为它的几何和材料特性，初始间隙和石墨烯层的数量的函数。
Modeling the buckling of multi walled carbon nanotube (MWCNT) probes/actuators in the vicinity of thin and thick graphite has been carried out for the first time via two analytical approximation methods as well as a numerical one. A hybrid nano-scale continuum model based on Lennard-Jones potential is applied to simulate the intermolecular force-induced deflection of MWCNT. The critical values of MWCNT tip deflection and MWCNT-graphite attraction at the onset of the instability are computed. In addition, minimum nanotube-graphite initial gap and stable length of freestanding CNT are determined as basic parameters for engineering applications and nano-devices design. The stable length of MWCNT is determined as a function of its geometrical and material characteristics, initial gap and number of graphene layers.