A dielectrophoretic study of the carbon nanotube chaining process and its dependence on the local electric fields
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The chaining process of a system of interacting carbon nanotubes (CNTs) under an alternating current electric field is investigated at two regions of different electric field characteristics. For the region of uniform electric field (far from the electrodes), a two-dimensional multiparticle approach based on the dielectrophoretic (DEP) theory and classical mechanics is proposed to investigate the CNT rotational and translation motion. For this scenario, CNT rotation and alignment along the electric field direction occurs first, followed by the translation and chaining processes which were found to be highly dependent on the CNT-to-CNT initial configuration. On the other hand, the presence of high electric field gradients governs the CNT chaining at regions near the electrodes. DEP forces caused by such gradients were computed by finite element analysis and compared to the magnitude of the CNT-to-CNT interacting forces at zones of uniform electric fields. A critical distance of CNT-to-CNT separation was estimated, which determines if a CNT is attracted towards the electrode or if it is attracted by other CNTs away from the electrodes. Experimental evidence of CNTs dynamic motion under electric fields is presented to support the predicted trends.
KeywordsCarbon nanotubes Dielectrophoresis Classical electrodynamics AC electric fields Dynamic motion
Technical support of Carlos Falla and José Bante (CINVESTAV) in the experimental section is strongly appreciated.
This work was supported by the “Fondo Sectorial de Investigación para la Educación” through the SEP-CONACYT grant No. 235905 (A.I. Oliva-Avilés). V.V. Zozulya acknowledges additional support from CONACYT project No. 256458.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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