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.

–

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