Effect of CNT length and structural density on viscoelasticity of buckypaper: A coarse-grained molecular dynamics study

摘要: Abstract Carbon nanotube (CNT) buckypapers, having exceptional mechanical and electrical properties, have been reported to demonstrate frequency-invariant temperature-invariant viscoelastic properties. In an attempt provide in-depth insight into the viscoelasticity of buckypapers with (5, 5) single-walled CNTs (SWCNTs), we perform coarse-grained non-equilibrium molecular dynamics simulations investigate effects oscillatory shear strain amplitude, buckypaper's density, length individual SWCNTs on SWCNT exhibit linear over amplitude from 0.03 0.05. Higher density can result in larger dynamic stiffness a higher loss factor up ∼0.29. frequency-independent regime (≤1 GHz), increasing causes very slight decrease elastic properties has minor influence viscous mode. Thus, this study provides deep demonstrates controllability excellent energy dissipation potential thus help us design new devices carbon nanomaterials.