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Dispersion of multiferroic BiFeO3 nanoparticles in nematic liquid crystals

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Abstract

Dispersion of ferroelectric- and ferromagnetic nanoparticles in liquid crystals (LCs) is investigated in the last decades. Recently, doping multiferroic-BiFeO3 nanoparticles in the LCs has become of interest. These nanoparticles have coupled ferroelectric- and ferromagnetic properties at ambient temperature. In the present experiments, a nematic LC was doped with a low concentration of BiFeO3 nanoparticles, synthesized using a modified Pechini method. The particles were characterized and their dispersions in heptane with an added surfactant were used for doping of the LC. The measured dielectric constants in the doped LCs varied as compared to the pure LC. It was shown that the presence of a magnetic field in the cooling process (cooling down from isotropic to anisotropic phase) of the LC cells leads to a significant increase of dielectric anisotropy. Also, the transition temperature decreased in the nematic-isotropic transition temperature for the doped sample.

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Acknowledgements

We would like to thank the University of Kassel and the Macromolecular Chemistry and Molecular Materials group for helpful discussions and the permission to use their facilities. We would like to thank Dr. Ivo de Sena Oliveira (University of Kassel) for the SEM images. We also would like to thank Nicolai Hoinka (University of Kassel) for the DSC measurement.

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Authors and Affiliations

  1. Department of Laser and Optical Engineering, University of Bonab, Bonab, Iran

    F. Jahanbakhsh & J. B. Poursamad

  2. Nanophotonics Laboratory, Applied Science Research Center, Kharazmi University, Karaj, Iran

    M. H. Majles Ara

  3. Department of Chemistry, Physical Chemistry, Paderborn University, Warburger Str. 100, 33098, Paderborn, Germany

    A. Lorenz

  4. Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran

    H. Khoshsima

  5. Physics Department Science and Research Branch, Islamic Azad University, Khuzestan, Iran

    M. Darabi

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  1. F. Jahanbakhsh
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  2. J. B. Poursamad
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  3. M. H. Majles Ara
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  4. A. Lorenz
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  5. H. Khoshsima
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  6. M. Darabi
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Contributions

The experiment was proposed by JBP. The nanoparticles were synthesized and characterised by FJ and MD. The experiments were performed by FJ. JBP, MHMA, AL and HK consulted and checked the results during the experiments. The manuscript was prepared by all of the authors.

Corresponding author

Correspondence to J. B. Poursamad.

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Jahanbakhsh, F., Poursamad, J.B., Ara, M.H.M. et al. Dispersion of multiferroic BiFeO3 nanoparticles in nematic liquid crystals. Appl. Phys. A 125, 877 (2019). https://doi.org/10.1007/s00339-019-3153-0

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  • DOI: https://doi.org/10.1007/s00339-019-3153-0

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