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arXiv · 2411.14118

Ferroelectric Nanoparticles in Liquid Crystals: The Role of Ionic Transport at Small Concentrations of the Nanoparticles

Juliya M. Gudenko·Oleksandr S. Pylypchuk·Victor V. Vainberg·Igor A. Gvozdovskyy·Serhii E. Ivanchenko·Denis O. Stetsenko·Nicholas V. Morozovsky·Volodymir N. Poroshin·Eugene A. Eliseev·Anna N. Morozovska
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Abstract

We reveal the visible influence of the ultra-small concentrations (1 wt.% or less) of the BaTiO3 nanoparticles (average size 24 nm) on the current-voltage characteristics and capacitance of the dielectric liquid crystal (LC) 5CB. The pure LC cell demonstrates higher current (and thus smaller resistance) than the LC cells filled with a very small concentration (0.5-1) wt.% of BTO nanoparticles. The same trend is observed for the charge-voltage characteristics: the capacitance loop is the widest for the pure LC cell and becomes noticeably thinner in the presence of (0.5-1) wt.% of BaTiO3 nanoparticles. This seems counterintuitive, because 1 wt.% of ferroelectric nanoparticles very slightly modify the effective dielectric response and should not influence on the director distribution and elastic properties of the LC. We conclude that a possible physical reason of this observation is the influence of the ionic-electronic screening charges, which cover the ferroelectric nanoparticles and become polarized in the external field, on the ionic transport in the LC.

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Juliya M. Gudenko, Oleksandr S. Pylypchuk, Victor V. Vainberg, Igor A. Gvozdovskyy, Serhii E. Ivanchenko, Denis O. Stetsenko, Nicholas V. Morozovsky, Volodymir N. Poroshin, Eugene A. Eliseev, Anna N. Morozovska. 2024-11-21. Ferroelectric Nanoparticles in Liquid Crystals: The Role of Ionic Transport at Small Concentrations of the Nanoparticles. https://doi.org/10.15407/spqeo28.01.010

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