Yoshio Masafumi, Mukai Tomohiro, Ohno Hiroyuki, Kato Takashi
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
J Am Chem Soc. 2004 Feb 4;126(4):994-5. doi: 10.1021/ja0382516.
New fan-shaped ionic liquids forming columnar liquid crystalline phases have been prepared to obtain one-dimensional ion-transporting materials. The ionic liquids consist of two incompatible parts: an imidazolium-based ionic part as an ion-conducting part and tris(alkyloxy)phenyl parts as insulating parts. Two compounds having octyl and dodecyl chains have been synthesized. Self-assembly of these materials leads to the formation of thermotropic hexagonal columnar liquid crystalline states at room temperature. Anisotropic one-dimensional ionic conductivities have been successfully measured by the cells having comb-shaped gold electrodes. The self-organized columns have been aligned macroscopically in two directions by shearing perpendicular and parallel to the electrodes. The ionic conductivities parallel to the column axis are higher than those perpendicular to the axis. The incorporation of lithium salts in these columnar materials leads to the enhancement of the ionic conductivities and their anisotropy. These materials would be useful for anisotropic transportation of ions at the nanometer level.
已制备出形成柱状液晶相的新型扇形离子液体，以获得一维离子传输材料。这些离子液体由两个不相容的部分组成：作为离子传导部分的咪唑基离子部分和作为绝缘部分的三（烷氧基）苯基部分。已合成了具有辛基和十二烷基链的两种化合物。这些材料的自组装导致在室温下形成热致性六方柱状液晶态。通过具有梳状金电极的电池成功测量了各向异性的一维离子电导率。通过垂直于和平行于电极方向的剪切，自组织柱已在两个方向上宏观排列。平行于柱轴的离子电导率高于垂直于轴的离子电导率。在这些柱状材料中加入锂盐会导致离子电导率及其各向异性的增强。这些材料将有助于在纳米水平上进行离子的各向异性传输。
