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

Chen, Heng; Zhang, Liuyang; Chen, Jinbao; Becton, Matthew; Wang, Xianqiao; Nie, Hong

doi:10.1016/j.carbon.2016.07.055

Cited by 17 publications

(12 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The density of buckypapers has a great impact on their elastic and viscoelastic properties [12,36,72]. The large values of G′ and G″ of SWCNT buckypapers might be induced by their relative high densities.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the specific storage modulus G′/ρ is insensitive to the different SWCNT lengths. In the previous study [36], the bending and buckling of long SWCNTs are considered to be the reason for the decrement of storage modulus with increasing SWCNT length. However, the results given in Figure 6 indicate that the elastic energy stored during the cyclic loading can be determined by the long-range vdW interactions under the small shear amplitude, which is directly related to the packing density of SWCNT beads.…”

Section: Resultsmentioning

confidence: 99%

“…The system composed of SWCNTs is further characterized by temperature, pressure and total amount of SWCNTs. The above coarse-grained model has been successfully used to reproduce the microstructure and mechanical properties of CNT buckypapers [ 12 , 40 ], viscoelasticity of CNT buckypapers [ 30 , 36 ], energy dissipation of CNT buckypaper under impact [ 34 ] and mechanical properties of CNT yarns [ 41 , 42 , 43 ].…”

Section: Computational Model and Methodologymentioning

confidence: 99%

“…Although extensive works have been done to explore the mechanical properties of buckypapers or CNT networks [31,32,33,34,35], few of them have explored the CNT length effect. Recently, Chen et al investigated the length effect of SWCNT buckypapers on their viscoelasticity [36]. However, the smallest length considered was L=100 nm in their works, which does not cover the whole spectrum of available SWCNT lengths.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper

et al. 2017

View full text Add to dashboard Cite

Abstract:The 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 tan δ, defined as the ratio of the loss modulus over the storage modulus, of buckypaper with short SWCNTs also increases with the increment of temperature or SWCNT length, before the SWCNTs are entangled together. The permeability of buckypapers is further investigated by studying the diffusion of structureless particles within buckypapers, denoted by the obstruction factor (β). It is found to be linearly dependent on the volume fraction of SWCNTs, signifying a mass-dominated permeability, regardless of the structure variations induced by different SWCNT lengths. The present study provides a comprehensive picture of the structure-property relationship for buckypapers composed of SWCNTs. The methodology could be used for designing multifunctional buckypaper-based devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Computational Model and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Besides the experimental studies described above, several molecular dynamics (MD) simulations have been reported to understand the dissipation mechanism in CNT gels . These studies can provide us an in‐depth understanding of the viscoelasticity.…”

Section: Vibration Damping In Carbon Nanotube Assembliesmentioning

confidence: 99%

Vibration Damping of Carbon Nanotube Assembly Materials

et al. 2017

View full text Add to dashboard Cite

Vibration reduction is of great importance in various engineering applications, and a material that exhibits good vibration damping along with high strength and modulus has become more and more vital. Owing to the superior mechanical property of carbon nanotube (CNT), new types of vibration damping material can be developed. This paper presents recent advancements, including our progresses, in the development of highdamping macroscopic CNT assembly materials, such as forests, gels, films, and fibers. In these assemblies, structural deformation of CNTs, zipping and unzipping at CNT connection nodes, strengthening and welding of the nodes, and sliding between CNTs or CNT bundles are playing important roles in determining the viscoelasticity, and elasticity as well. Towards the damping enhancement, strategies for micro-structure and interface design are also discussed.

show abstract

Research progress on enhancement mechanism and mechanical properties of FRP composites reinforced with graphene and carbon nanotubes

Han¹,

Zhou²,

Shi³

2023

Alexandria Engineering Journal

View full text Add to dashboard Cite

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

Cited by 17 publications

References 68 publications

Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper

Carbon Nanotube Length Governs the Viscoelasticity and Permeability of Buckypaper

Vibration Damping of Carbon Nanotube Assembly Materials

Research progress on enhancement mechanism and mechanical properties of FRP composites reinforced with graphene and carbon nanotubes

Contact Info

Product

Resources

About