Vimalanathan Kasturi, Gascooke Jason R, Suarez-Martinez Irene, Marks Nigel A, Kumari Harshita, Garvey Christopher J, Atwood Jerry L, Lawrance Warren D, Raston Colin L
Flinders Centre for NanoScale Science &Technology, School of Chemical &Physical Sciences, Flinders University, Adelaide SA 5001, Australia.
Nanochemistry Research Institute, Department of Physics and Astronomy, School of Science, Curtin University, Bentley Campus, Perth, WA 6102, Australia.
Sci Rep. 2016 Mar 11;6:22865. doi: 10.1038/srep22865.
Lateral slicing of micron length carbon nanotubes (CNTs) is effective on laser irradiation of the materials suspended within dynamic liquid thin films in a microfluidic vortex fluidic device (VFD). The method produces sliced CNTs with minimal defects in the absence of any chemical stabilizers, having broad length distributions centred at ca 190, 160 nm and 171 nm for single, double and multi walled CNTs respectively, as established using atomic force microscopy and supported by small angle neutron scattering solution data. Molecular dynamics simulations on a bent single walled carbon nanotube (SWCNT) with a radius of curvature of order 10 nm results in tearing across the tube upon heating, highlighting the role of shear forces which bend the tube forming strained bonds which are ruptured by the laser irradiation. CNT slicing occurs with the VFD operating in both the confined mode for a finite volume of liquid and continuous flow for scalability purposes.
在微流体涡旋流体装置（VFD）中，对悬浮在动态液体薄膜中的微米级碳纳米管（CNT）进行横向切片，可通过激光照射实现。该方法在不存在任何化学稳定剂的情况下，能产生缺陷极少的切片碳纳米管。利用原子力显微镜确定，单壁、双壁和多壁碳纳米管的切片长度分布较宽，中心分别约为190nm、160nm和171nm，小角中子散射溶液数据也支持这一结果。对曲率半径约为10nm的弯曲单壁碳纳米管（SWCNT）进行分子动力学模拟，结果表明加热时碳纳米管会发生撕裂，突出了剪切力的作用，剪切力使碳纳米管弯曲形成应变键，而激光照射会使这些应变键断裂。VFD在有限体积液体的受限模式和为实现可扩展性的连续流动模式下运行时，均可实现碳纳米管切片。
