Effect of temperature on memory effect in nematic phase of liquid crystal and their composites with aerosil and geothite nanoparticles

0577701 - FZÚ 2024 RIV NL eng J - Journal Article
Zakutanská, K. - Miakota, D. - Lacková, V. - Jeng, S.-C. - Weglowska, D. - Agresti, F. - Jarošová, Markéta - Kopčanský, P. - Tomašovičová, N.
Effect of temperature on memory effect in nematic phase of liquid crystal and their composites with aerosil and geothite nanoparticles.
Journal of Molecular Liquids. Roč. 391, Dec (2023), č. článku 123357. ISSN 0167-7322. E-ISSN 1873-3166
R&D Projects: GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : liquid crystals * aerosil nanoparticles * magnetic nanoparticles * non-volatile memory
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6, year: 2022
Method of publishing: Open access

Liquid crystal doped with aerosil nanoparticles is known for exhibiting an electromechanical memory effect. After exposing the composite to the electric field the state induced by the electric field stays remembered due to the presence of aerosil nanoparticles. In this paper, we investigated the memory effect induced by electric and magnetic fields. Liquid crystal 4-cyano-4′-pentylbiphenyl doped with non-magnetic aerosil nanoparticles and a mixture of aerosil nanoparticles and elongated magnetic goethite nanoparticles were explored via capacitance measurements. Studied systems exhibited hysteresis in capacitance-voltage and capacitance-magnetic field dependences. The measurements revealed a great impact of temperature and heating/cooling rate on the hysteresis of the system. Observed electromechanical and magnetomechanical memory effect provides potential use of the system as voltage-driven or magnetic field-driven non-volatile memory devices.
Permanent Link: https://hdl.handle.net/11104/0346823