Abstract
The van der Waals (vdW) interactions of carbon nanotube (CNT)-substrate and CNT-CNT can cause strong adhesion. The adhesion can lead to radial deformation of CNTs, which is shown in both experiments and theoretical analysis. A scaling approach is used to predict the mechanical properties, vdW adhesion, and the elastic deformation of CNTs. It is found that the indentation of CNT is proportional to R 7/4 and R -3/2 in nanotube-substrate system and two same CNT system. Here, R and R are the radius and the wall thickness of CNT, respectively. The indentation ratio H 1/ H 2 for CNT-CNT is proportional to ( R 1/ R 2)3/2 and ( R 2/ R 1)3/2.
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