Dielectrophoretic modeling of the dynamic carbon nanotube network formation in viscous media under alternating current electric fields

被引：40

作者：

Oliva-Aviles, A. I. ^{[1
]}

Aviles, F. ^{[2
]}

Sosa, V. ^{[1
]}

Seidel, G. D. ^{[3
]}

机构：

[1] Ctr Invest & Estud Avanzados, Unidad Merida, Dept Fis Aplicada, Merida 97310, Yucatan, Mexico

[2] Ctr Invest Cient Yucatan, Unidad Mat, Merida 97200, Yucatan, Mexico

[3] Virginia Polytech Inst & State Univ, Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA

来源：

CARBON | 2014年 / 69卷

关键词：

AC DIELECTROPHORESIS; ELLIPSOIDAL MOLECULES; SURFACE CONDUCTANCE; LATEX SPHERES; ELECTROPHORESIS; ORIENTATION; FABRICATION; COMPOSITES; SEPARATION; PARTICLES;

D O I：

10.1016/j.carbon.2013.12.035

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：342 / 354

页数：13

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