Phase transitions and dynamics in ionic liquid crystals confined in nanopores

• DOI: 10.1063/5.0185093
• Publication Date: 2024-01-23T11:55:03Z
• Authors: Hiroki Nobori; Daisuke Fujimoto; Jun Yoshioka; Koji Fukao; Takashi Konishi; Ken Taguchi
• Keywords: Nanopore; Dynamics

We investigate the phase-transition behavior of ionic liquid crystals, namely 1-methyl-3-alkylimidazolium tetrafluoroborate, [Cnmim]BF4, confined in cylindrical nanopores using differential scanning calorimetry, x-ray scattering, and dielectric relaxation spectroscopy. Here, n is number carbon atoms alkyl part this crystal. For = 10 12, isotropic phase changes to smectic then a metastable for cooling process. During subsequent heating process, via crystalline phases. The transition temperatures crystal decrease linearly with increase inverse pore diameter, except transitions between In phase, rate α-process shows Vogel-Fulcher-Tammann type temperature dependence some ranges. glass evaluated from dynamics decreases diameter increases n. effect confinement on chain can clearly be observed 10, melting slightly higher than that bulk, while, nanopores, phase. This suggests thermodynamically stable, thanks effect.