TAILIEUCHUNG - CARBON NANOTUBES SYNTHESIS, CHARACTERIZATION, APPLICATIONS_2

Carbon nanotubes are one of the most intriguing new materials with extraordinary properties being discovered in the last decade. The unique structure of carbon nanotubes provides nanotubes with extraordinary mechanical and electrical properties. The outstanding properties that these materials possess have opened new interesting researches areas in nanoscience and nanotechnology. Although nanotubes are very promising in a wide variety of fields, application of individual nanotubes for large scale production has been limited | Part 2 Characterization Properties of CNTs 11 Study of Carbon Nanotubes Based on Higher Order Cauchy-Born Rule Jinbao Wang1 2 Hongwu Zhang2 Xu Guo2 and Meiling Tian1 1School of Naval Architecture Civil Engineering Zhejiang Ocean University 2State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Faculty of Vehicle Engineering and Mechanics Dalian University of Technology 1. Introduction Since single-walled carbon nanotube SWCNT and multi-walled carbon nanotube MWCNT are found by Iijima 1991 1993 these nanomaterials have stimulated extensive interest in the material research communities in the past decades. It has been found that carbon nanotubes possess many interesting and exceptional mechanical and electronic properties Ruoff et al. 2003 Popov 2004 . Therefore it is expected that they can be used as promising materials for applications in nanoengineering. In order to make good use of these nanomaterials it is important to have a good knowledge of their mechanical properties. Experimentally Tracy et al. 1996 estimated that the Young s modulus of 11 MWCNTs vary from to with an average of by measuring the amplitude of their intrinsic thermal vibrations and it is concluded that carbon nanotubes appear to be much stiffer than their graphite counterpart. Based on the similar experiment method Krishnan et al. 1998 reported that the Young s modulus is in the range of to with an average of for 27 SWCNTs. Direct tensile loading tests of SWCNTs and MWCNTs have also been performed by Yu et al. 2000 and they reported that the Young s modulus are for SWCNTs and for MWCNTS respectively. In the experiment however it is very difficult to measure the mechanical properties of carbon nanotues directly due to their very small size. Based on molecular dynamics simulation and Tersoff-Brenner atomic potential Yakobson et al. 1996 predicted that the axial .

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