• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development of functional polymers by using liquid crystals, light, and phase transition

Research Project

Project/Area Number 25410218
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Polymer/Textile materials
Research InstitutionUniversity of Tsukuba

Principal Investigator

Goto Hiromasa  筑波大学, 数理物質系, 准教授 (40292528)

Project Period (FY) 2013-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywordsキラル / ポーラロン / 円偏光 / 液晶 / 干渉 / 電荷移動相互作用 / 電解重合 / Circular polarized light / polymerization / laser / charge transfer / electrolyte
Outline of Final Research Achievements

Electrochemical synthesis of polymers having liquid crystal like order was carried out in liquid crystal electrolyte solution. Electrochemical reactions were performed under circular polarized light in an isotropic solution to obtain chiral polymer from achiral monomer. Liquid crystal electrochemical polymerization in a magnetic field was carried out for obtaining perpendicular oriented polymer film on the substrate. Optically active chiral charge carrier "chiralions of helical form of polarons (radical cation) and bipolaron (dications) was evaluated and defined. Chiral polymer blends were synthesized in liquid crystal electrolyte solution with electrochemical polymerization, and evaluated their optical texture and optical activity. Furthermore, pi-conjugated polymers having optically active group were synthesized. Optical activity of the polymers thus prepared was evaluated.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (51 results)

All 2016 2015 2014 2013

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Acknowledgement Compliant: 4 results,  Open Access: 2 results) Presentation (43 results) (of which Int'l Joint Research: 8 results,  Invited: 2 results)

  • [Journal Article] A Poly(ter(3,4-ethylenedioxythiophene)) Showing Concentric-Circle Morphology Prepared by Electrochemical Synthesis in Smectic A Liquid Crystal under Vertical Strong Magnetic Field2016

    • Author(s)
      Hiroki Hayashi, Kohsuke Kawabata, Shigeki Nimori, Hiromasa Goto
    • Journal Title

      Chemistry Letters

      Volume: 45 Issue: 2 Pages: 170-172

    • DOI

      10.1246/cl.151066

    • NAID

      130005124728

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Thiophene-based chiral small bandgap pi-conjugated polymers: synthesis and optical properties2015

    • Author(s)
      Aohan Wang, Kohsuke Kawabata, Hiromasa Goto
    • Journal Title

      Designed Monomers and Polymers

      Volume: 18 Issue: 4 Pages: 360-366

    • DOI

      10.1080/15685551.2015.1012625

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Synthesis of a Terpene-Based New Chiral Inducer and Preparation of an Asymmetric Polymer2015

    • Author(s)
      Atsushi Matsumura, Fan Yang, Hiromasa Goto
    • Journal Title

      Polymers

      Volume: 7 Issue: 1 Pages: 147-155

    • DOI

      10.3390/polym7010147

    • NAID

      120007130478

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Synthesis of new chiral inducer and preparation of semi-conducting polymer films showing fingerprint structure2014

    • Author(s)
      Hiroki Hayashi, Kohsuke Kawabata, Hiromasa Goto
    • Journal Title

      International Letters of Chemistry, Physics and Astronomy

      Volume: 8 Pages: 6-12

    • Related Report
      2014 Research-status Report
    • Open Access / Acknowledgement Compliant
  • [Journal Article] Synthesis of chiral inducers having double stereogenic centers for electrochemical polymerization in cholesteric liquid crystal medium2014

    • Author(s)
      Tomokazu Iseki, Kohsuke Kawabata, Shigeki Nimori, Hiromasa Goto
    • Journal Title

      Synthetic Metals

      Volume: 187 Pages: 217-223

    • NAID

      120007130534

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Synthesis and Properties of Low-Bandgap Liquid Crystalline π-Conjugated Polymers2013

    • Author(s)
      Hiromasa Goto, Aohan Wang, Kohsuke Kawabata, Fan Yang
    • Journal Title

      Journal of Materials Science

      Volume: 48 Issue: 21 Pages: 7523-7532

    • DOI

      10.1007/s10853-013-7567-3

    • NAID

      120007130205

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mechanical Orientation and Magnetic Evaporation Orientation of a Low-Bandgap Liquid Crystalline π-Conjugated Polymer2013

    • Author(s)
      Hiromasa Goto, Aohan Wang, Shigeki Nimori, Kohsuke Kawabata
    • Journal Title

      Liq. Cryst.

      Volume: 9 Issue: 9 Pages: 1159-1166

    • DOI

      10.1080/02678292.2013.818168

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Horizontal and Vertical Orientation of Polybithiophenes by Electrochemical Polymerization in Magnetically Aligned Smectic Liquid Crystal2013

    • Author(s)
      K. Kawabata, S. Nimori, H. Goto
    • Journal Title

      ACS Macro Letters

      Volume: 12 Issue: 7 Pages: 587-591

    • DOI

      10.1021/mz400213k

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] 液晶を鋳型とする電解重合法により配向制御した共役系ポリマーの電気伝導度評価2015

    • Author(s)
      林宏紀、林仁志、後藤博正
    • Organizer
      第30回高分子学会関東支部茨城地区若手の会交流会
    • Place of Presentation
      つくばセミナーハウス(茨城県つくば市)
    • Year and Date
      2015-10-29
    • Related Report
      2015 Annual Research Report
  • [Presentation] 液晶中電解重合によるポリマーの配向2015

    • Author(s)
      董 九超, 川畑公輔, 王 傲寒, 後藤博正
    • Organizer
      日本化学会第5回CSJ科学フェスタ2015
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-10-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] ディスコチック液晶を用いた電解重合における導電性高分子の配向制御2015

    • Author(s)
      江口直人, 後藤博正
    • Organizer
      日本化学会第5回CSJ科学フェスタ2015
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-10-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] 液晶をテンプレートとした配向性導電性高分子フィルムの電解合成およびその光学・導電特性2015

    • Author(s)
      林 宏紀, 川畑公輔, 林 仁志, 後藤博正
    • Organizer
      日本化学会第5回CSJ科学フェスタ2015
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-10-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] Chiral Electrochemical Polymerization in Liquid Crystal and Finding of Chiral Charge Carrier “Chiralion”2015

    • Author(s)
      Aohan Wang, Kohsuke Kawabata, Hirotsugu Kawashima, Hiromasa Goto
    • Organizer
      International Congress on Science & Nature (ISNaC) 2015
    • Place of Presentation
      Kuala Lumpur, Malaysia
    • Year and Date
      2015-09-21
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electrochemical Polymerization in Smectic A Liquid Crystal and Polymers Orientation2015

    • Author(s)
      Jiuchao Dong, Kohsuke Kawabata, Aohan Wang, Hiromasa Goto
    • Organizer
      International Congress on Science & Nature (ISNaC) 2015
    • Place of Presentation
      Kuala Lumpur, Malaysia
    • Year and Date
      2015-09-21
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ディスコティック液晶を用いた電解重合による導電性高分子の配向制御2015

    • Author(s)
      江口直人, 後藤 博正
    • Organizer
      第64回高分子討論会
    • Place of Presentation
      東北大学川内キャンパス(宮城県仙台市)
    • Year and Date
      2015-09-15
    • Related Report
      2015 Annual Research Report
  • [Presentation] 配向液晶中電解重合を用いた配向性共役系高分子薄膜の開発2015

    • Author(s)
      林 宏紀, 林仁志, 後藤 博正
    • Organizer
      第64回高分子討論会
    • Place of Presentation
      東北大学川内キャンパス(宮城県仙台市)
    • Year and Date
      2015-09-15
    • Related Report
      2015 Annual Research Report
  • [Presentation] Synthesis and Properties of a Liquid Crystalline pi-Conjugated Polymer2015

    • Author(s)
      Aohan Wang, Hiromasa Goto
    • Organizer
      Interdisciplinary Workshop on Science and Patents 2015
    • Place of Presentation
      University of Tsukuba(茨城県つくば市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Synthesis of Conductive Polymer by Electrical Polymerization in Discotic Liquid Crystal2015

    • Author(s)
      Naoto Eguchi, Hiromasa Goto
    • Organizer
      Interdisciplinary Workshop on Science and Patents 2015
    • Place of Presentation
      University of Tsukuba(茨城県つくば市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Synthesis of Blending Polymer in Liquid Crystal2015

    • Author(s)
      Tomoaki Jo, Hiromasa Goto
    • Organizer
      Interdisciplinary Workshop on Science and Patents 2015
    • Place of Presentation
      University of Tsukuba(茨城県つくば市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Chiral Side Chain Modified Poly(phenylene-alt-fluorene)2015

    • Author(s)
      Haoyue Shen, Hiromasa Goto
    • Organizer
      Interdisciplinary Workshop on Science and Patents 2015
    • Place of Presentation
      University of Tsukuba (茨城県つくば市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Electrochemical polymerization in liquid crystal and correlation between macromolecular orientation and molecular structure2015

    • Author(s)
      Jiuchao Dong, Kohsuke Kawabata, Aohan Wang, Hiromasa Goto
    • Organizer
      Interdisciplinary Workshop on Science and Patents 2015
    • Place of Presentation
      University of Tsukuba(茨城県つくば市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Polymer Orientation Controlled by Liquid Crystalline Templates: Enhanced Electrical Conductivity2015

    • Author(s)
      Hiroki Hayashi, Hitoshi Hayashi, Hiromasa Goto
    • Organizer
      Interdisciplinary Workshop on Science and Patents 2015
    • Place of Presentation
      University of Tsukuba(茨城県つくば市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 共役系高分子を用いたキラルポリマーブレンドの作製2015

    • Author(s)
      城智晃、後藤博正
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] ライオトロピック液晶構造のポリピロールへの転写と評価2015

    • Author(s)
      江口直人, 後藤博正
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] スメクチック A 液晶を電解液に用いた、液晶構造をもつポリマーフィルムの表面構造2015

    • Author(s)
      董九超、後藤博正
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] 水平配向処理した液晶中でのポリマーフィルム作製とその電気伝導度および円二色性に関する評価2015

    • Author(s)
      林宏紀、後藤博正、林仁志
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] スメクチック液晶中の電解重合およびポリマーの配向2015

    • Author(s)
      董九超、後藤博正
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] 水平配向処理した液晶中での電解重合ポリマーフィルムの作製とその酸化還元による電気的・光学的特性2015

    • Author(s)
      林宏紀、後藤博正、林仁志
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] 液晶構造を転写したキラルポリマーブレンドの特性評2015

    • Author(s)
      城智晃、後藤博正
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] ライオトロピック液晶を用いた導電性高分子の合成2015

    • Author(s)
      江口直人、後藤博正
    • Organizer
      平成27 年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀(東京都江戸川区)
    • Year and Date
      2015-06-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] 液晶電解重合法を用いたキラルポリマーブレンド2015

    • Author(s)
      城智晃・後藤博正
    • Organizer
      日本化学会 第95春季年会
    • Place of Presentation
      日本大学 理工学部船橋キャンパス/薬学部
    • Year and Date
      2015-03-26 – 2015-03-29
    • Related Report
      2014 Research-status Report
  • [Presentation] スメクチックA 液晶中の電解重合およびポリマーフィルムの表面構造に関する研究2015

    • Author(s)
      董九超・後藤博正
    • Organizer
      日本化学会 第95春季年会
    • Place of Presentation
      日本大学 理工学部船橋キャンパス
    • Year and Date
      2015-03-26 – 2015-03-29
    • Related Report
      2014 Research-status Report
  • [Presentation] Electrochemical Synthesis of Polythiophene Films in Cholesteric and Smectic Liquid Crystals2014

    • Author(s)
      Hiroki HAYASHI, Tomokazu ISEKI, and Hiromasa GOTO
    • Organizer
      MRS 2014 Fall Meeting & Exhibit.
    • Place of Presentation
      Boston’s Hynes Convention Center and Sheraton Boston Hotel, Boston, USA
    • Year and Date
      2014-11-30 – 2014-12-05
    • Related Report
      2014 Research-status Report
  • [Presentation] Magnetic Electrochemical Synthesis of Uniaxial Poly(3,4-ethylenedioxythiophene) Films in Smectic Liquid Crystal2014

    • Author(s)
      Hiroki HAYASHI, Kosuke Kawabata, Shigeki Nimori, and Hiromasa GOTO
    • Organizer
      MRS 2014 Fall Meeting & Exhibit.
    • Place of Presentation
      Boston’s Hynes Convention Center and Sheraton Boston Hotel, Boston, USA
    • Year and Date
      2014-11-30 – 2014-12-05
    • Related Report
      2014 Research-status Report
  • [Presentation] 液晶磁場電解重合による配向性導電性高分子の開発 (研究奨励賞,35歳以下))2014

    • Author(s)
      林宏紀、二森茂樹、後藤博正
    • Organizer
      日本磁気科学会第9回年会
    • Place of Presentation
      高山市民文化会館、岐阜高山
    • Year and Date
      2014-11-13 – 2014-11-14
    • Related Report
      2014 Research-status Report
  • [Presentation] スメクチック液晶溶媒を用いた磁場配向下液晶中電解重合による高異方性ポリマーフィルムの作製(ポスター賞)2014

    • Author(s)
      林 宏紀・川畑公輔・二森茂樹・後藤博正
    • Organizer
      第4回CSJ化学フェスタ
    • Place of Presentation
      タワーホール船堀 (東京)
    • Year and Date
      2014-10-14 – 2014-10-16
    • Related Report
      2014 Research-status Report
  • [Presentation] ボルネオールを用いた液晶不斉電解重合法による光学活性ポリエチレンジオキシチオフェンの合成2014

    • Author(s)
      松村 篤・楊帆・後藤博正
    • Organizer
      第4回CSJ化学フェスタ
    • Place of Presentation
      タワーホール船堀 (東京)
    • Year and Date
      2014-10-14 – 2014-10-16
    • Related Report
      2014 Research-status Report
  • [Presentation] イソロイシン骨格を有するインデューサーの合成と液晶電解重合法によるらせんポリマーの作製2014

    • Author(s)
      城 智晃・董 九超・王 傲寒・後藤博正
    • Organizer
      第4回CSJ化学フェスタ
    • Place of Presentation
      タワーホール船堀 (東京)
    • Year and Date
      2014-10-14 – 2014-10-16
    • Related Report
      2014 Research-status Report
  • [Presentation] スメクチック液晶磁場電解重合による一軸配向性ポリマーフィルムの作製2014

    • Author(s)
      林 宏紀・川畑 公輔・二森 茂樹・後藤 博正
    • Organizer
      第63回高分子討論会
    • Place of Presentation
      長崎大学
    • Year and Date
      2014-09-25
    • Related Report
      2014 Research-status Report
  • [Presentation] Electrochemical polymerization in cholesteric liquid crystal by using a novel chiral dopant2014

    • Author(s)
      Jiuchao Dong, Kohsuke Kawabata, Hiromasa Goto
    • Organizer
      The 8th International Conference on Molecular Imprinting (MIP2014)
    • Place of Presentation
      Jiangsu University, Zhenjiang, China.
    • Year and Date
      2014-09-18 – 2014-09-21
    • Related Report
      2014 Research-status Report
  • [Presentation] A new method for preparing P-N junction by using Electropolymerization2014

    • Author(s)
      Yuki Kudo, Hiromasa Goto
    • Organizer
      International Workshop on Science and Patents 2014
    • Place of Presentation
      University hall, Universtity of Tsukuba, Tsukuba
    • Year and Date
      2014-09-05
    • Related Report
      2014 Research-status Report
  • [Presentation] lectrochemical Synthesis of High Anisotropic Polymer Films in Magnetically Aligned Smectic Liquid Crystal2014

    • Author(s)
      Hiroki HAYASHI, Kosuke KAWABATA, Shigeki NIMORI, Hiromasa GOTO 16) (Poster award)
    • Organizer
      International Workshop on Science and Patents 2014
    • Place of Presentation
      University hall, University of Tsukuba, Tsukuba
    • Year and Date
      2014-09-05
    • Related Report
      2014 Research-status Report
  • [Presentation] Synthesis of borneol-containing Chiral Inducers and Optically Active Poly(3,4-ethylenedioxythio-phene)2014

    • Author(s)
      Atsushi Matsumura, Fan Yang and Hiromasa Goto
    • Organizer
      International Workshop on Science and Patents 2014
    • Place of Presentation
      University hall, University of Tsukuba, Tsukuba
    • Year and Date
      2014-09-05
    • Related Report
      2014 Research-status Report
  • [Presentation] Electrochemical polymerization in cholesteric liquid crystal by using a novel chiral dopant2014

    • Author(s)
      Jiuchao Dong, Kohsuke Kawabata, Hiromasa Goto
    • Organizer
      International Workshop on Science and Patents 2014
    • Place of Presentation
      University hall, University of Tsukuba, Tsukuba
    • Year and Date
      2014-09-05
    • Related Report
      2014 Research-status Report
  • [Presentation] Synthesis and Properties of Chiral Inducer of Liquid Crystal Using Isoleucine2014

    • Author(s)
      Tomoaki Jo, Jiuchao Dong, Aohan Wang, Hiromasa Goto
    • Organizer
      International Workshop on Science and Patents 2014
    • Place of Presentation
      University hall, University of Tsukuba, Tsukuba
    • Year and Date
      2014-09-05
    • Related Report
      2014 Research-status Report
  • [Presentation] Synthesis of Conjugated Polymer Film by Electrolytic Polymerization in Lyotropic Liquid Crystal2014

    • Author(s)
      Naoto Eguchi, Hiromasa Goto
    • Organizer
      International Workshop on Science and Patents 2014
    • Place of Presentation
      University hall, University of Tsukuba, Tsukuba
    • Year and Date
      2014-09-05
    • Related Report
      2014 Research-status Report
  • [Presentation] イソロイシンを用いた液晶電解重合法および得られたらせん構造を有するポリマーの表面観察2014

    • Author(s)
      城智晃,董九超,王傲寒, 後藤博正
    • Organizer
      平成26年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀 (東京)
    • Year and Date
      2014-06-11 – 2014-06-13
    • Related Report
      2014 Research-status Report
  • [Presentation] ボルネオールを用いたキラルインデューサーの合成と液晶不斉電解重合2014

    • Author(s)
      松村篤,楊帆,後藤博正
    • Organizer
      平成26年度繊維学会年次大会
    • Place of Presentation
      タワーホール船堀 (東京)
    • Year and Date
      2014-06-11 – 2014-06-13
    • Related Report
      2014 Research-status Report
  • [Presentation] フッ素原子をもつダブルキラル型インデューサーを用いた液晶電解重合によるポリチオフェン誘導体の合成2014

    • Author(s)
      城 智晃・董 九超・王 傲寒・後藤 博正
    • Organizer
      第63回高分子年次大会
    • Place of Presentation
      名古屋国際会議場 (名古屋市)
    • Year and Date
      2014-05-28 – 2014-05-30
    • Related Report
      2014 Research-status Report
  • [Presentation] Synthesis and characterisation of novel thieno[3,2-b]thiophene-based chiral inducer and application in electrochemical polymerization2014

    • Author(s)
      Jiuchao Dong・Kohsuke Kawabata・Hiromasa Goto
    • Organizer
      第63回高分子年次大会
    • Place of Presentation
      名古屋国際会議場 (名古屋市)
    • Year and Date
      2014-05-28 – 2014-05-30
    • Related Report
      2014 Research-status Report
  • [Presentation] Synthesis of Optically Active Conjugated Polymers by Electrochemical Polymerization in Menthol-Containig Liquid Crystal2014

    • Author(s)
      Hiroki Hayashi・Tomokazu Iseki・Hiromasa Goto
    • Organizer
      第63回高分子年次大会
    • Place of Presentation
      名古屋国際会議場 (名古屋市)
    • Year and Date
      2014-05-28 – 2014-05-30
    • Related Report
      2014 Research-status Report

URL: 

Published: 2014-07-25   Modified: 2019-07-29  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi