Ferroelectric Nanoparticles in Liquid Crystals: The Role of Ionic Transport at Small Concentrations of the Nanoparticles
| Autor: | Gudenko, Juliya M., Pylypchuk, Oleksandr S., Vainberg, Victor V., Gvozdovskyy, Igor A., Ivanchenko, Serhii E., Stetsenko, Denis O., Morozovsky, Nicholas V., Poroshin, Volodymir N., Eliseev, Eugene A., Morozovska, Anna N. |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | 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. Comment: 16 pages, 7 figures, to be published in Semiconductor Physics, Quantum Electronics and Optoelectronics, vol. 28, No 1 (2025) |
| Databáze: | arXiv |
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