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Simulation of Tensile Behaviors of bamboo-like Carbon Nanotubes Based on Molecular Structural Mechanics Approach Combining with Finite Element Analysis

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 11-16页

作者： SHU Yang QI Lehua School of Mechatronics Northwestern Polytechnical University School of Materials Science and Engineering Northwestern Polytechnical University Center for Composite Materials and Structures Harbin Institute of Technology

A molecular structural mechanics approach combining with finite element analysis(MSM/FEA) was applied to study the microstructure and tensile behaviors of bamboo-like carbon nanotubes(BCNTs). The mathematical model of tensile behaviors of BCNTs was established based on molecular structural mechanics theory. The deformations of BCNTs, with different diameters and compartments set based on the experimental investigation on BCNT structures synthesized by chemical vapor depositon, under tensile load, were analyzed with ANSYS programmed. Results show that the BCNTs have good tensile properties, and those Young's modulus can reach 0.84 Tpa. Through the analysis, it can be found that the Young's modulus of BCNTs depends on the diameters and the length of compartment, which is in good agreement with our experimental tests for the tensile performances of individual BCNT.

关键词： molecular structural mechanics approach bamboo-like carbon nanotubes Young’s modulus experimental test

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A Study on the Effects of Carrier Gases on the Structure and Morphology of Carbon Nanotubes Prepared by Pyrolysis of Ferrocene and C_2H_2 Mixture

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Journal of Natural Gas Chemistry 2005年第3期14卷 151-155页

作者： Wanliang Mi Jerry Yuesheng Lin Qian Mao Yongdan Li Baoquan Zhang School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Department of Chemical and Materials Engineering Arizona State University Tempe AZ 85287-6006 United States

Carbon nanotubes （CNTs） were prepared using different carrier gases, with ferrocene as the catalyst precusor and acetylene as the carbon source. The effects of ammonia and nitrogen as carrier gases on the structure and morphology of CNTs were investigated. Transmission electron microscope （TEM）, high-resolution electron microscope （HRTEM）, scanning electron microscope （SEM） and X-ray diffraction （XRD） were employed to characterize the products and the catalyst. Experiment results show that the CNTs grown in N2 gas exhibited cylindrical and tubular structure, while a bamboo-like structure was observed for the CNTs grown in NH3 gas. Moreover, vertically aligned CNTs were obtained on an A12O3 disk when NH3 was used as the carrier gas. The carrier gas also exerted influence on the shape of the catalyst. Based on the theory of active centers of catalysis and combined with the particle shape of the catalyst, a growth model for the vertically aligned CNTs on the substrate is given.

关键词： carbon nanotube ferrocene vertically aligned bamboo-like carrier gas growth model

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