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

Hemang J Shah; Adam K Fontecchio; Davide Mattia; Yury Gogotsi

doi:10.1063/1.2844384

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

Hemang J Shah, Adam K Fontecchio, Davide Mattia, Yury Gogotsi

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

30 Citations (SciVal)

Abstract

A nematic-to-isotropic transition was obsd. in suspensions of C nanotubes (CNTs) and a cyanobiphenyl-based liq. crystal (LC) confined within an In Sn oxide glass sandwich cell. Upon the application of elec. 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 temp. of the LC-CNT medium. Hence, starting from a metastable nematic phase, a complete transition to the isotropic phase is obsd. On removal of the elec. field, the transition is reversed with the LC-CNT medium returning to the nematic phase. (c) 2008 American Institute of Physics.

Original language	English
Pages (from-to)	064314/1-064314/5
Journal	Journal of Applied Physics
Volume	103
Issue number	6
DOIs	https://doi.org/10.1063/1.2844384
Publication status	Published - 2008

Keywords

field controlled nematic-to-isotropic phase transition in 5CB liq. crystal-carbon nanotube composites)
Liquid crystals (transitions
Electric field
nematic isotropic transition 5CB liq crystal carbon nanotube composite
Composites
Liquid crystals (field controlled nematic-to-isotropic phase transition in 5CB liq. crystal-carbon nanotube composites)

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10.1063/1.2844384

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title = "Field controlled nematic-to-isotropic phase transition in liquid crystal-carbon nanotube composites",

abstract = "A nematic-to-isotropic transition was obsd. in suspensions of C nanotubes (CNTs) and a cyanobiphenyl-based liq. crystal (LC) confined within an In Sn oxide glass sandwich cell. Upon the application of elec. 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 temp. of the LC-CNT medium. Hence, starting from a metastable nematic phase, a complete transition to the isotropic phase is obsd. On removal of the elec. field, the transition is reversed with the LC-CNT medium returning to the nematic phase. (c) 2008 American Institute of Physics.",

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author = "Shah, {Hemang J} and Fontecchio, {Adam K} and Davide Mattia and Yury Gogotsi",

year = "2008",

doi = "10.1063/1.2844384",

language = "English",

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journal = "Journal of Applied Physics",

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AU - Shah, Hemang J

AU - Fontecchio, Adam K

AU - Mattia, Davide

AU - Gogotsi, Yury

PY - 2008

Y1 - 2008

N2 - A nematic-to-isotropic transition was obsd. in suspensions of C nanotubes (CNTs) and a cyanobiphenyl-based liq. crystal (LC) confined within an In Sn oxide glass sandwich cell. Upon the application of elec. 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 temp. of the LC-CNT medium. Hence, starting from a metastable nematic phase, a complete transition to the isotropic phase is obsd. On removal of the elec. field, the transition is reversed with the LC-CNT medium returning to the nematic phase. (c) 2008 American Institute of Physics.

AB - A nematic-to-isotropic transition was obsd. in suspensions of C nanotubes (CNTs) and a cyanobiphenyl-based liq. crystal (LC) confined within an In Sn oxide glass sandwich cell. Upon the application of elec. 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 temp. of the LC-CNT medium. Hence, starting from a metastable nematic phase, a complete transition to the isotropic phase is obsd. On removal of the elec. field, the transition is reversed with the LC-CNT medium returning to the nematic phase. (c) 2008 American Institute of Physics.

KW - field controlled nematic-to-isotropic phase transition in 5CB liq. crystal-carbon nanotube composites)

KW - Liquid crystals (transitions

KW - Electric field

KW - nematic isotropic transition 5CB liq crystal carbon nanotube composite

KW - Composites

KW - Liquid crystals (field controlled nematic-to-isotropic phase transition in 5CB liq. crystal-carbon nanotube composites)

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UR - http://dx.doi.org/10.1063/1.2844384

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DO - 10.1063/1.2844384

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JF - Journal of Applied Physics

IS - 6

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

Abstract

Keywords

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