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Field controlled nematic-to-isotropic phase transition in liquid crystal–carbon nanotube composites

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4 Author(s)
Shah, Hemang J. ; Department of Electrical and Computer Engineering, and A.J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, Pennsylvania 19104, USA ; Fontecchio, Adam K. ; Mattia, Davide ; Gogotsi, Yury

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2844384 

A nematic-to-isotropic transition has been observed in suspensions of carbon nanotubes (CNTs) and a cyanobiphenyl-based liquid crystal (LC) confined within an indium tin oxide glass sandwich cell. Upon the application of electric field, CNTs rotate out of plane short-circuiting the electrodes and producing a current flow through the CNTs. The resulting Joule heating leads to a local increase in temperature of the LC-CNT medium. Hence, starting from a metastable nematic phase, a complete transition to the isotropic phase is observed. On removal of the electric field, the transition is reversed with the LC-CNT medium returning to the nematic phase.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 6 )

Date of Publication:

Mar 2008

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