The sensitivity of liquid crystal doped with functionalized carbon nanotubes to external magnetic fields

Zuzana Mitróová; Natália Tomašovičová; Milan Timko; Martina Koneracká; Jozef Kováč; Jan Jadzyn; Ivo Vávra; Nándor Éber; Tibor Tóth-Katona; Eric Beaugnon; Xavier Chaud; Peter Kopčanský

doi:10.1039/C1NJ20017H

The sensitivity of liquid crystal doped with functionalized carbon nanotubes to external magnetic fields†

Zuzana Mitróová,^a Natália Tomašovičová,^a Milan Timko,^a Martina Koneracká,^a Jozef Kováč,^a Jan Jadzyn,^b Ivo Vávra,^c Nándor Éber,^d Tibor Tóth-Katona,^d Eric Beaugnon,^e Xavier Chaud^e and Peter Kopčanský^a

Author affiliations

^a Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
E-mail: mitro@saske.sk
Fax: +421 55 633 62 92
Tel: +421 55 792 22 33

^b Institute of Molecular Physics, Polish Academy of Sciences Smoluchowskiego 17, 60179 Poznan, Poland
E-mail: jadzyn@ifmpan.poznan.pl
Fax: +48 61 868 45 24
Tel: +48 61 8695167

^c Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia
E-mail: elekvavr@savba.sk
Fax: +421 2 5477 5816
Tel: +421 02 5922 2889

^d Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
E-mail: eber@szfki.hu

^e High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, Grenoble, France
E-mail: eric.beaugnon@grenoble.cnrs.fr

Abstract

Stable colloidal suspensions of single-walled carbon nanotubes (SWCNT) and magnetite-labeled SWCNT (SWCNT/Fe₃O₄) in thermotropic liquid crystal 4-(trans-4′-n-hexylcyclohexyl)isothiocyanatobenzene (6CHBT) were investigated. The presence of the magnetite in SWCNT/Fe₃O₄ product has been checked with infrared spectroscopy. Transmission electron microscopy has been employed to obtain the structural and dimensional data for the used samples. Magnetic properties of the samples have been investigated by a SQUID magnetometer and a significant increase of the saturation magnetization has been shown for magnetite labeled SWCNT. The structural changes in the liquid crystal doped with SWCNT or SWCNT/Fe₃O₄ in electric and magnetic fields were investigated. The density of anchoring energy at the nematic–magnetic particle boundary was determined and it was shown that the density of the anchoring energy for liquid crystal doped with SWCNT/Fe₃O₄ is higher than that for the liquid crystal doped with net SWCNT.

This article is part of the themed collection: Molecular Materials (MOLMAT)

New Journal of Chemistry

The sensitivity of liquid crystal doped with functionalized carbon nanotubes to external magnetic fields†

Abstract

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The sensitivity of liquid crystal doped with functionalized carbon nanotubes to external magnetic fields

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