Electro-caloric Effect of Liquid Crystals with Direct Isotropic - Ferroelectric Nematic transition.

ORAL

Abstract

The study of electro-caloric effects (ECEs) in solid state materials such as ferroelectric ceramics and ferroelectric polymers have great impact in developing cooling systems. Recently, dielectric fluids at Isotropic – Nematic [1] and Isotropic – Nematic – Ferroelectric Nematic [2] transitions have been studied and found to have large (up to 3K / (V/μm)) ECEs with simpler structure compared to the solid-state materials. Here, we report studies on systems with direct Isotropic-Ferroelectric Nematic transition. With an enthalpy of 4.7J/g and electric field of 1.1V/μm we can induce a 2K change in the transition temperature in spite of the fact that the material is fairly ionic. Studies are underway to increase the effect by reducing the ionic content.

[1] Qian, X.-S., Lu, S.-G., Li, X., Gu, H., Chien, L.-C. and Zhang, Q. (2013), Large Electrocaloric Effect in a Dielectric Liquid Possessing a Large Dielectric Anisotropy Near the Isotropic–Nematic Transition. Adv. Funct. Mater., 23: 2894-2898.



[2] Jadwiga Szydlowska, Pawel Majewski, Mojca Čepič, Nataša Vaupotič, Paulina Rybak, Corrie T. Imrie, Rebecca Walker, Ewan Cruickshank, John M. D. Storey, Pociecha Damian, and Ewa Gorecka, Ferroelectric Nematic-Isotropic Liquid Critical End Point. Phys. Rev. Lett. 130, 216802 (2023).

* This work was supported by NSF DMR 2210083.

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Publication: Nil

Presenters

  • Alex O Adaka

    Materials Science Graduate Program, Kent State University,, Materials Science Graduate Program and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA

Authors

  • Alex O Adaka

    Materials Science Graduate Program, Kent State University,, Materials Science Graduate Program and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA

  • Parikshit Guragain

    Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA, Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, USA

  • Robert J. Twieg

    Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA, Kent State University, Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, USA

  • ANTAL I JAKLI

    Department of Physics, Kent State University, Kent State University, Materials Sciences Graduate Program and Advanced Materials and Liquid Crystal Institute, Department of Physics, Kent State University, Kent, Ohio 44242, USA