title: Ionic Switch Induced by a Rectangular-Hexagonal Phase Transition in Benzenammonium Columnar Liquid Crystals.
abstract: We demonstrate switching of ionic conductivities in wedge-shaped liquid-crystalline (LC) ammonium salts. A thermoreversible phase transition between the rectangular columnar (Colr) and hexagonal columnar (Colh) phases is used for the switch. The ionic conductivities in the Colh phase are about four orders of magnitude higher than those in the Colr phase. The switching behavior of conductivity can be ascribed to the structural change of assembled ionic channels. X-ray experiments reveal a highly ordered packing of the ions in the Colr phase, which prevents the ion transport.
authors.affiliation: Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.|CREST, JST , 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Bartolome
authors.initials: B
authors.lastname: Soberats
authors.affiliation: Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Yoshio
authors.affiliation: Department of Biotechnology, Faculty of Engineering, Tokyo University of Agriculture and Technology , Nakacho, Koganei, Tokyo 184-8588, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ichikawa
authors.affiliation: Department of Materials Science and Engineering, University of Sheffield , Sheffield S13JD, United Kingdom.|Department of Physics, Zheijiang Sci-Tech University , Hangzhou 310018, China.
authors.forename: Xiangbing
authors.initials: X
authors.lastname: Zeng
authors.affiliation: Department of Biotechnology, Faculty of Engineering, Tokyo University of Agriculture and Technology , Nakacho, Koganei, Tokyo 184-8588, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ohno
authors.affiliation: Department of Materials Science and Engineering, University of Sheffield , Sheffield S13JD, United Kingdom.|Department of Physics, Zheijiang Sci-Tech University , Hangzhou 310018, China.
authors.forename: Goran
authors.initials: G
authors.lastname: Ungar
authors.affiliation: Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.|CREST, JST , 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kato
mesh_terms: D064751:Ammonium Compounds / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry*; D007477:Ions; D050866:Liquid Crystals / Q000737:chemistry*
chemical_list: D064751:Ammonium Compounds; D007477:Ions; D001554:Benzene