Dielectrophoretic modeling of the dynamic carbon nanotube network formation in viscous media under alternating current electric fields |
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| Affiliation: | 1. Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Departamento de Física Aplicada, A.P. 73-Cordemex, 97310 Mérida, Yucatán, Mexico;2. Centro de Investigación Científica de Yucatán, Unidad de Materiales, Calle 43 No. 130 Col. Chuburná de Hidalgo, 97200 Mérida, Yucatán, Mexico;3. Aerospace and Ocean Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;1. Advanced Composites Centre for Science and Innovation (ACCIS), Department of Aerospace Engineering, University of Bristol, Queen’s Building, Bristol BS8 1TR, United Kingdom;2. Centre for Nanoscience and Quantum Information (NSQI), Tyndall Avenue, Bristol BS8 1FD, United Kingdom;3. Institute for Composites Science and Innovation (InCSI), College of Materials Science and Engineering, Zhejiang University, Hangzhou, PR China;1. National Institute of Advances Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan;2. Smart Energy Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan;3. Technology Research Association for Single Wall Carbon Nanotubes (TASC), Tsukuba 305-8565, Japan;1. Department of Mechanical Engineering, Khalifa University, Abu Dhabi, UAE;2. Computer and Software Engineering, Khalifa University, Sharjah, UAE;3. Department of Mechanical Engineering, UAE University, Al Ain, UAE;1. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China;3. Wenhua Institute, Huazhong University of Science and Technology, Wuhan, 430074, China;1. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;2. Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;3. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | The dynamic formation of carbon nanotube (CNT) networks in liquids under the application of an alternating current electric field is investigated using the effective dipole modeling approach. Three mechanisms are investigated by a set of three independent nonlinear differential equations derived from dielectrophoretic theory, viz. CNT rotation, CNT-to-CNT Coulombic interactions, and CNT migration towards an electrode. The models consider the effect of the electric field magnitude and frequency, the CNT’s concentration and aspect ratio, and the viscosity of the surrounding medium. A layer at the CNT/liquid interface is included and the effect of such a layer’s permittivity, electrical conductivity and thickness is investigated. Modeling predictions allow the reconstruction of the dynamic sequence of events leading to an aligned CNT network, which strongly depends on the CNT’s aspect ratio and concentration. Experimental trends regarding the effect of frequency can only be captured by considering an interface layer in the model. |
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