Hennrich Frank, Krupke Ralph, Arnold Katharina, Rojas Stütz Jan A, Lebedkin Sergei, Koch Thomas, Schimmel Thomas, Kappes Manfred M
Forschungszentrum Karlsruhe, Institut für Nanotechnologie, D-76021 Karlsruhe, Germany.
J Phys Chem B. 2007 Mar 1;111(8):1932-7. doi: 10.1021/jp065262n. Epub 2007 Feb 3.
Aqueous suspensions of length selected single-walled carbon nanotubes were studied by atomic force microscopy (AFM) in order to probe the influence of sonication on nanotube scission. The maximum of the tube length distribution, lM, initially exhibits a power law dependence on the sonication time, t - roughly as lM approximately t(-0.5). This and the limiting behavior observed at longer times can be rationalized to first order in terms of a continuum model deriving from polymer physics. In this picture, the strain force associated with cavitation scales with the square of the nanotube length. Scission stops when the strain force falls below the critical value for nanotube disruption.
为了探究超声处理对纳米管断裂的影响，我们通过原子力显微镜（AFM）研究了长度选择的单壁碳纳米管的水悬浮液。管长分布的最大值lM最初表现出对超声处理时间t的幂律依赖性——大致为lM约为t^(-0.5)。这一现象以及在较长时间观察到的极限行为，可以根据源自聚合物物理学的连续介质模型，在一阶近似下得到合理的解释。在这个模型中，与空化相关的应变力与纳米管长度的平方成正比。当应变力低于纳米管断裂的临界值时，断裂停止。
