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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Multiscale modeling and simulation of nanotube-based torsional oscillators | Nanoscale Res Lett 2007 2 54-59 DOI 10.1007 S11671-006-9030-8 NANO EXPRESS Multiscale modeling and simulation of nanotube-based torsional oscillators Shaoping Xiao Wenyi Hou Published online 28 November 2006 to the authors 2006 Abstract In this paper we propose the first numerical study of nanotube-based torsional oscillators via developing a new multiscale model. The edge-to-edge technique was employed in this multiscale method to couple the molecular model i.e. nanotubes and the continuum model i.e. the metal paddle. Without losing accuracy the metal paddle was treated as the rigid body in the continuum model. Torsional oscillators containing 10 0 nanotubes were mainly studied. We considered various initial angles of twist to depict linear nonlinear characteristics of torsional oscillators. Furthermore effects of vacancy defects and temperature on mechanisms of nanotube-based torsional oscillators were discussed. Keywords Nanotube Torsional oscillator Multiscale Vacancy defects Temperature Introduction Since the discovery of carbon nanotubes CNTs 1 in 1991 these special cylindrical nanostructures have been intensively studied and discussed. Their extraordinary mechanical and electrical properties 2 ensure that CNTs will play an essential role in the design of nanoscale devices such as nanotweezers 3 nanogears 4 nanotube motors 5 and axial nano-oscillators 6 . Recently a nanoelectromechanical device 7-9 based S. Xiao H W. Hou Department of Mechanical and Industrial Engineering Center for Computer-Aided Design The University of Iowa 3131 Seamans Center Iowa City IA 52242 USA e-mail shaoping-xiao@uiowa.edu on an individual CNT serving as a torsional spring and mechanical support has been successfully fabricated. Williams and co-workers 7 8 reported fabrication of nanoscale mechanical devices which consist of a suspended lever i.e. the paddle connected by CNTs as torsion beams to stationary leads. Papadakis et al. 9 used similar techniques to synthesize so-called .
