Structural changes in the 6CHBT liquid crystal doped with spherical, rodlike, and chainlike magnetic particles

Peter Kopčanský, Natália Tomašovičová, Martina Koneracká, Vlasta Závišová, Milan Timko, Anežka Džarová, Adriana Šprincová, Nándor Éber, Katalin Fodor-Csorba, Tibor Tóth-Katona, Aniko Vajda, and Jan Jadzyn
Phys. Rev. E 78, 011702 – Published 3 July 2008

Abstract

In this work the 4-(trans-4n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT) liquid crystal was doped with differently shaped magnetite nanoparticles. The structural changes were observed by capacitance measurements and showed significant influence of the shape and size of the magnetic particles on the magnetic Fréedericksz transition. For the volume concentration ϕ=2×104 of the magnetic particles, the critical magnetic field was established for the pure liquid crystal, and for liquid crystals doped with spherical, chainlike, and rodlike magnetic particles. The influence of the magnetic field depends on the type of anchoring, which is characterized by the density of anchoring energy and by the initial orientation between the liquid crystal molecules and the magnetic moment of the magnetic particles. The experimental results indicated soft anchoring in the case of spherical magnetic particles and rigid anchoring in the case of rodlike and chainlike magnetic particles, with parallel initial orientation between the magnetic moments of the magnetic particles and director.

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  • Received 13 March 2008

DOI:https://doi.org/10.1103/PhysRevE.78.011702

©2008 American Physical Society

Authors & Affiliations

Peter Kopčanský, Natália Tomašovičová, Martina Koneracká, Vlasta Závišová, Milan Timko, Anežka Džarová, and Adriana Šprincová*

  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 04001 Košice, Slovakia

Nándor Éber, Katalin Fodor-Csorba, Tibor Tóth-Katona, and Aniko Vajda

  • Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, H-1525 Budapest, P. O. Box 49, Hungary

Jan Jadzyn

  • Institute of Molecular Physics, Polish Academy of Sciences, 60179 Poznan, Poland

  • *Also at JINR, Laboratory of Radiation Biology, Dubna, Russia.

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Vol. 78, Iss. 1 — July 2008

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