Issue 37, 2023

Rapid, solvent-minimized and sustainable access to various types of ferroelectric-fluid molecules by harnessing mechano-chemical technology

Abstract

Recently, ferroelectric fluid, such as ferroelectric nematic liquid crystals (NFLCs) and ferroelectric smectic A LCs (SmAFLCs), has been of great fundamental and practical interest owing to its excellent polarization properties (e.g., dielectric permittivity, polarization, and nonlinear optical coefficient). To deeply understand the physical underpinning of such emergent ferroelectric phases and develop state-of-the-art device applications, effective preparation of various NF molecules is essential. Herein, to expand the NFLC molecular library, we implemented a mechanochemical (MC) technique for the production of LCs, demonstrating its high synthetic compatibility with NF/SmAFLCs. Chemical building blocks with high polarity can be bonded one by one through various ball-milling MC reactions, resulting in rapid access to NFLC molecules, a series of DIO, RM734, UUZU, and BIOTN, with high yield within 2.7–7 h for 4–8 steps. For a new DIO variant, in which a terminal alkyl chain was completely removed, for the first time, we discovered the direct phase transition from the isotropic liquid to the SmAF phase. Furthermore, the highly bistable polarization memory (∼5.2 μC cm−2) in the SmAF phases was evaluated using the positive–up–negative–down (PUND) method.

Graphical abstract: Rapid, solvent-minimized and sustainable access to various types of ferroelectric-fluid molecules by harnessing mechano-chemical technology

  • This article is part of the themed collection: #MyFirstJMCC

Supplementary files

Article information

Article type
Paper
Submitted
24 6 2023
Accepted
05 9 2023
First published
06 9 2023

J. Mater. Chem. C, 2023,11, 12525-12542

Author version available

Rapid, solvent-minimized and sustainable access to various types of ferroelectric-fluid molecules by harnessing mechano-chemical technology

H. Nishikawa, M. Kuwayama, A. Nihonyanagi, B. Dhara and F. Araoka, J. Mater. Chem. C, 2023, 11, 12525 DOI: 10.1039/D3TC02212A

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