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2005 Fiscal Year Final Research Report Summary

Studies on rapid molecular diffusion and charge propagation in a quasi-solid of nanostructured polymers

Research Project

Project/Area Number 15550101
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Polymer chemistry
Research InstitutionIbaraki University

Principal Investigator

KANEKO Masao  Ibaraki University, College of Science, Professor, 理学部, 教授 (90109794)

Project Period (FY) 2003 – 2005
KeywordsPolysaccharide solid / Solid state electrochemistry / Diffusion coefficient of molecules / Ionic conduction / Alternating current impedance spectroscopy / Redox molecules / Cyclic voltammogram / Dye-sensitized solar cell
Research Abstract

A quasi solid composed of double helical nanoheterostructured polysaccharide network involving excess water was prepared by heating an aqueous solution of the polysaccharide utilizing microwave irradiation and by the following cooling and solidification. The solid was prepared in the presence of various redox molecules and before cooling down three electrodes (working, counter, and reference) were soaked in the hot solution to prepare a solid involving redox compound installed with three electrodes. Thus, solid state electrochemical measurements were for the first time realized. The ionic conductivity, electrochemical reactivity and diffusion coefficient of molecules in the solid were analyzed by cyclic voltammetry and alternating current impedance spectroscopy. It was shown that electrochemical reactions and molecular diffusion depend on the polysaccharide concentration and the redox compound structure in the solid, so that the behavior was analyzed in relevance to the charge propagat … More ion mechanism through the redox molecules.
As for the polymers, agarose, carageenan, agar, etc. were used. Ionic conductivity by various ions was measured. As for the redox molecules to study molecular diffusion, Ru(bpy)_3^<2+> with sensitizing ability, various metal complexes with various catalysis function (cyano complexes, ammine complexes, Prussian Blue, etc.), and methylviologen were used. Fundamental data of ion diffusion and ionic conductivity were accumulated. It was clarified that conductivity by small ions is the same as in an aqueous solution. Alternating current impedance spectroscopy exhibited interesting results that the resistance for charge transfer and double layer capacitance on the electrode surface is larger than those in an aqueous solution, but that the resistance for charge transport decreases with the increase of the polysaccharide concentration. By utilizing these solids photosensor of humidity was fabricated. The solid was successfully applied to solidify the organic liquid electrolyte solution in a dye-sensitized solar cell, giving almost similar conversion efficiency for the solid type cell as a liquid type one. Less

  • Research Products

    (13 results)

All 2005 2004 2003 Other

All Journal Article (10 results) Book (2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Effect of Humidity on Photoluminescence from Ru(bpy)_3^<2+> Incorporated into a Polysaccharide Solid Film and its Application to Optical Humidity Sensor2005

    • Author(s)
      K.Takato, N.Gokan, M.Kaneko., (2005)
    • Journal Title

      J.Photochem.Photobiol. 169

      Pages: 109-114

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of Humidity on Photoluminescence from Ru(bpy)_3^<2+> Incorporated into a Polysaccharide Solid Film and its Application to Optical Humidity Sensor2005

    • Author(s)
      K.Takato, N.Gokan, M.Kaneko
    • Journal Title

      J.Photochem.Photobiol. 169

      Pages: 109-114

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A Medium Wherein Molecular Diffusion Takes Place the Same as in a Liquid but Convection is Prohibited2004

    • Author(s)
      M.Kaneko, N.Gokan, K.Takato
    • Journal Title

      Chem.Lett. 33

      Pages: 686-687

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Investigation of nanostructured Polysaccharide Solid Medium for Electrochemistry2004

    • Author(s)
      H.Ueno, M.Kaneko
    • Journal Title

      J.Electroanal.Chem 568

      Pages: 87-92

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] New Ionically Conductive Solid of Polysaccharide Containing Excess Water2004

    • Author(s)
      H.Ueno, Y.Endo, Y.Kaburagi, M.Kaneko
    • Journal Title

      J.Electroanal.Chem 570

      Pages: 95-100

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Solid Medium for Conventional Electrochemical Measurements2004

    • Author(s)
      N.Mochizuki, H.Ueno, M.Kaneko
    • Journal Title

      Electrochim.Acta 49

      Pages: 4143-4148

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] ナノ構造ヒドロゲルリアクターを用いた電気化学測定と分子拡散2004

    • Author(s)
      金子正夫
    • Journal Title

      高分子加工 53

      Pages: 407-411

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Investigation of nanostructured Polysaccharide Solid Medium for Electrochemistry2004

    • Author(s)
      H.Ueno, M.Kaneko
    • Journal Title

      J.Electroanal.Chem. 568

      Pages: 87-92

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] New Ionically Conductive Solid of Polysaccharide Containing Excess Water2004

    • Author(s)
      H.Ueno, Y.Endo, Y.Kaburagi, M.Kaneko
    • Journal Title

      J.Electroanal.Chem. 570

      Pages: 95-100

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Electrochemical measurements and molecular diffusion in nanostructured hydrogel reactors2004

    • Author(s)
      M.Kaneko
    • Journal Title

      Polymer Applications (Review in Japanese language) 53

      Pages: 407-411

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] ナノ・IT時代の分子機能材料と素子開発(分担pp.444-456)2004

    • Author(s)
      金子正夫
    • Total Pages
      771
    • Publisher
      エヌ・テイー・エス
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] Development of molecular functional materials and devices in nano- and IT-era

    • Author(s)
      M.Kaneko
    • Total Pages
      444-456
    • Publisher
      NTS Publisher (Book in Japanese language)
    • Description
      「研究成果報告書概要(欧文)」より
  • [Patent(Industrial Property Rights)] 固体型色素増感太陽電池及びその製造方法2003

    • Inventor(s)
      金子正夫
    • Industrial Property Rights Holder
      KOA(株)金子正夫
    • Industrial Property Number
      特願 2003-297173
    • Filing Date
      2003-08-21
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2007-12-13  

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