Abstract
High- and low-gradient magnetic fields are produced by resistor-inductor-capacitor (RLC) discharge apparatuses. The maximum magnetic field is 12.5 Tesla with 1-ms pulse duration. Multiwall carbon nanotube–polypyrrole composite is prepared. The samples are exposed to high- and low-gradient magnetic fields. To understand the behavior of carbon nanotubes (CNTs) in high-gradient magnetic fields (HGMFs), we theoretically calculated the equivalent magnetic susceptibility of a CNT in the gradient magnetic field. We found that the gradient force which is exerted on a CNT could be repellent or absorbent depending on the parallel and perpendicular susceptibilities of the CNT, as well as on the initial orientation of the CNT with respect to magnetic field direction. Four-probe studies show that the electrical conductivity of CNT composites decreases after exposure to a high-gradient magnetic field. Microscopic observation of the electrical current profile of composites reveals rearrangement of CNTs under HGMF.
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We would like to thank Laleh Kazemikia for her fruitful discussions and for editing the article.
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Kazemikia, K., Bonabi, F., Asadpoorchallo, A. et al. Effect of High-Gradient Magnetic Field on Electrical Property of Carbon Nanotube-Polypyrrole Composite; Nanotube Separation Mechanism. J Supercond Nov Magn 31, 327–336 (2018). https://doi.org/10.1007/s10948-017-4243-x
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DOI: https://doi.org/10.1007/s10948-017-4243-x