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Phase Transitions in Liquid Crystal Doped with Magnetic Particles of Different Shapes in Combined Electric and Magnetic Fields

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Abstract

We have studied the influence of electric and magnetic fields on the orientational structure of ferronematics based on a thermotropic nematic 4-trans-4\(^{\prime }\)-n-hexylcyclohexyl-isothiocyanato-benzene (6CHBT). The 6CHBT liquid crystal has been dissolved in phenyl isothiocyanate and doped with rod-like or chain-like magnetic particles. In such a mixture, the phase transition from an isotropic to a nematic phase is via a droplet state, i.e., coexistence of nematic and isotropic phases. The obtained results showed that a combination of the electric and magnetic fields can change the character of a phase transition from the isotropic to the nematic phase via the droplet state in such systems. Moreover, magneto-dielectric measurements of structural transitions showed the magnetic field induced a shift of the phase transition temperature from the isotropic to the droplet state.

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Acknowledgments

This work was supported by Project VEGA 0045, the Slovak Research and Development Agency under the Contract Nos. APVV-0171-10 and APVV-0509-07, Ministry of Education Agency for Structural Funds of EU in frame of Project 6220120021, 6220120033, and 26110230061, M-era.Net Project MACOSYS, and the Grenoble High Magnetic Field Laboratory (CRETA).

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Authors and Affiliations

  1. Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 , Kosice, Slovakia

    Natália Tomašovičová, Milan Timko, Vlasta Závišová, Anežka Hashim & Peter Kopčanský

  2. Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 , Poznan, Poland

    Jan Jadzyn

  3. Grenoble High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, Grenoble, France

    Xavier Chaud & Eric Beaugnon

Authors
  1. Natália Tomašovičová
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  2. Milan Timko
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  3. Vlasta Závišová
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  4. Anežka Hashim
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  5. Jan Jadzyn
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  6. Xavier Chaud
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  7. Eric Beaugnon
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  8. Peter Kopčanský
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Correspondence to Natália Tomašovičová.

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Tomašovičová, N., Timko, M., Závišová, V. et al. Phase Transitions in Liquid Crystal Doped with Magnetic Particles of Different Shapes in Combined Electric and Magnetic Fields. Int J Thermophys 35, 2044–2053 (2014). https://doi.org/10.1007/s10765-014-1622-4

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  • DOI: https://doi.org/10.1007/s10765-014-1622-4

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