Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper
AbstractThe effects of carbon nanotube (CNT) length on the viscoelasticity and permeability of buckypaper, composed of (5,5) single-walled CNTs (SWCNTs), are systematically explored through large-scale coarse-grained molecular dynamics simulations. The SWCNT length is found to have a pronounced impact on the structure of buckypapers. When the SWCNTs are short, they are found to form short bundles and to be tightly packed, exhibit high density and small pores, while long SWCNTs are entangled together at a low density accompanied by large pores. These structure variations contribute to distinct performances in the viscoelasticity of buckypapers. The energy dissipation for buckypapers with long SWCNTs under cyclic shear loading is dominated by the attachment and detachment between SWCNTs through a zipping-unzipping mechanism. Thus, the viscoelastic characteristics of buckypapers, such as storage and loss moduli, demonstrate frequency- and temperature-independent behaviors. In contrast, the sliding-friction mechanism controls the energy dissipation between short SWCNTs when the buckypaper is under loading and unloading processes. Friction between short SWCNTs monotonically increases with rising length of SWCNTs and temperature. Therefore, the
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Shen, Z.; Röding, M.; Kröger, M.; Li, Y. Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper. Polymers 2017, 9, 115.
Shen Z, Röding M, Kröger M, Li Y. Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper. Polymers. 2017; 9(4):115.Chicago/Turabian Style
Shen, Zhiqiang; Röding, Magnus; Kröger, Martin; Li, Ying. 2017. "Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper." Polymers 9, no. 4: 115.