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Oriented columnar films of a polar 1,2,3-triazole-based liquid crystal prepared by applying an electric field

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Abstract

We report the electric-field (E-field)-assisted orientation of a bent-core liquid crystal (LC) based on the polar 1,2,3-triazolyl group. The LC exhibited a hexagonal columnar (COLhex) phase at ambient temperature, which transformed into a disordered columnar (COLdis) phase with short-range correlation upon heating. Dielectric relaxation spectroscopy and switching studies revealed that the aromatic cores could undergo in-plane rotation (α-relaxation) in the COLhex phase, while R-relaxation allowing the reorientation of the triazolyl units along the E-field direction occurred in the COLdis phase. Infrared spectroscopy confirmed that the hydrogen-bonding interactions between triazolyl units along the columnar axis affected the molecular motion. Based on the dynamics studies, two columnar alignment methods under E-fields, i.e., an isothermal method in the COLhex phase and a cooling method from the COLdis to COLhex phase were examined. Both methods give high-quality oriented columnar thin films. In particular, the cooling method requires less time (only 1 min) and a weaker E-field (10 V μm−1), and therefore, it could be applied to the alignment of a bulk-level film (thickness: 260 μm). The successful orientation could be verified by in situ X-ray diffraction analysis under an E-field. The current–voltage curves before and after the alignment indicated that the orientation process enhanced electric conduction.

Graphical abstract: Oriented columnar films of a polar 1,2,3-triazole-based liquid crystal prepared by applying an electric field

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Publication details

The article was received on 17 Jun 2017, accepted on 24 Jul 2017 and first published on 25 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02710A
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Oriented columnar films of a polar 1,2,3-triazole-based liquid crystal prepared by applying an electric field

    M. L. Nguyen, T. J. Shin, H. Kim and B. Cho, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC02710A

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