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IONIC CONDUCTORS IN THE FORM OF WELL-ORDERED NANO-CHANNELS AND THEIR NOVEL FUNCTIONAL PROPERTIES

Research Project

Project/Area Number 15510097
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nanomaterials/Nanobioscience
Research InstitutionTohoku University

Principal Investigator

MAEKAWA Hideki  Tohoku University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (60238847)

Co-Investigator(Kenkyū-buntansha) YAMAMURA Tsutomu  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (80005363)
SATO Yuzuru  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (80108464)
KAWAMURA Junichi  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (50142683)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2003: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsIonic conductor / Mesoporous material / Nano-composite / Lithium ion / Proton / Self-assembly / Size-effect
Research Abstract

The purpose of the present investigation is to prepare nano-channeled ceramics including Al_2O_3, SiO_2 and ZrO_2 with various pore sizes by means of sol-gel synthesis, and to investigate conductivity and diffusive properties of protons and lithium ions confined within mesosized space, aiming for development of novel ionic functional properties.
Powdered mesoporous ceramics with various pore sizes was prepared by the sol-gel method utilizing neutral surfactants as structure-directing agent. The N_2 adsorption and desorption isotherms of the mesoporous-Al_2O_3 were Type IV, with a small hysteresis that indicates a minor deviation from a regular array of cylinders. A sharply peaked distribution was observed reflecting a uniform mesopore size controlled from 3 to 22 nm. The dc conductivity for 0.5(mesoporous-Al_2O_3 (pore size=4nm))-0.5LiI composite increased with increasing mesoporous-Al_2O_3 content up to x=0.5. The maximum conductivity was 2.6×10^<-4>S cm^<-1> at 298 K, which is more th … More an 1000 times as high as that of pure LiI, and more than 10 times improvement was achieved compared to previously reported LiI-Al_2O_3 composite. A systematic pore size dependence of the conductivity was observed. The conductivity increased with decreasing pore size except for pore size=2.8 nm.
High protonic conductivity of 1% LaCl_3 doped mesoporous-Al_2O_3 samples with different mesopore size ranging from 3.7 nm to 15.8 nm was discovered. The highest conductivity was obtained 0.004S・cm^<-1> at 25℃ which is approaching that of Nafion. It is clear that the conductivity increased with increasing the pore size monotonically. To the best of our knowledge, this is a first demonstration of the systematic pore size dependence upon protonic conduction of the porous media. From the TG/DTA and ^1H NMR, the conduction mechanism was attributed hopping of protons in the water layer. We categorize proton species into three groups, physically absorbed water (group I), water molecules bound to surface OH groups (group II) and surface OH groups (group III). We assume the major species for ionic conduction is due to protons of group II. From NMR, group II protons have close relation with the NUR observed"mobile"protons. On the other hand, the polymer composite with this mesoporous alumina powders by utilizing silan-coupling reagent (LS-3380) and polymerization with AMPS, MBAA and MA yields whitish membrane composite. This polymer composite did not show any change under treatment at 100℃ for one week and shows a protonic conductivity in the range of 10^<-5> Scm^<-1>. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (23 results)

All 2005 2004 Other

All Journal Article (16 results) Patent(Industrial Property Rights) (1 results) Publications (6 results)

  • [Journal Article] Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous Alumina-Ionic Conductor Composites.2005

    • Author(s)
      H.Maekawaら
    • Journal Title

      MRS Symposium Proceedings 835

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous Alumina-Ionic Conductor Composites.2005

    • Author(s)
      H.Maekawa et al.
    • Journal Title

      MRS Symposium Proceedings 835

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Single-crystal X-ray diffraction study on MgAl_2O_4-MgFe_2O_4 spinel solid solution : the miscibility gap and cation distribution.2004

    • Author(s)
      A.Nakatsukaら
    • Journal Title

      Phys.Chem.Minerals 31

      Pages: 278-287

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous Alumina-LiI Composite.2004

    • Author(s)
      H.Maekawaら
    • Journal Title

      Solid State Ionics 175

      Pages: 281-285

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] High Temperature Proton NMR Study of Yttrium Doped Barium Cerates.2004

    • Author(s)
      H.Maekawaら
    • Journal Title

      Solid State Commun. 130

      Pages: 73-77

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] High Proton Conductivity of Mesoporous Al_2O_3.2004

    • Author(s)
      H.Shenら
    • Journal Title

      Solid State Ionics : The Science and Technology of Ions in Motion (Eds. B.V.R.Chowdari, H.-L.Yoo, G.M.Choi, J.-H.Lee)

      Pages: 187-193

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous-Alumina-Ionic Conductor Composites.2004

    • Author(s)
      H.Maekawaら
    • Journal Title

      Solid State Ionics : The Science and Technology of Ions in Motion (Eds. B.V.R.Chowdari, H.-L.Yoo, G.M.Choi, J.-H.Lee)

      Pages: 851-857

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Single-crystal X-ray diffraction study on MgAl_2O_4-MgFe_2O_4 spinel solid solution : the miscibility gap and cation distribution.2004

    • Author(s)
      A.Nakatsuka et al.
    • Journal Title

      Phys.Chem.Minerals 31

      Pages: 278-287

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous Alumina-LiI Composites.2004

    • Author(s)
      H.Maekawa et al.
    • Journal Title

      Solid State Ionics 175

      Pages: 281-285

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] High Temperature Proton NMR Study of Yttrium Doped Barium Cerates.2004

    • Author(s)
      H.Maekawa et al.
    • Journal Title

      Solid State Commun. 130

      Pages: 73-77

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] High Proton Conductivity of Mesoporous Al_2O_3.2004

    • Author(s)
      H.Shen et al.
    • Journal Title

      Solid State Ionics, The Science and Technology of Ions in Motion(Eds.B.VR.Chowdari, H.-L.Yoo, GM.Choi, J.-H.Lee)

      Pages: 187-193

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous Alumina-Ionic Conductor Composites.2004

    • Author(s)
      H.Maekawa et al.
    • Journal Title

      Solid Sate Ionics, The Science and Technology of Ions in Motion(Eds.B.V.R.Chowdari, H.-L.Yoo, G.M.Choi, J.-H.Lee)

      Pages: 851-857

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Single-crystal X-ray diffraction study on MgAl_2O_4-MgFe_2O_4 spinel solid solution the miscibility gap and catin distribution2004

    • Author(s)
      A.Nakatsukaら
    • Journal Title

      Phys.Chem.Minerals 31

      Pages: 278-287

    • Related Report
      2004 Annual Research Report
  • [Journal Article] High Temperature Proton NMR Study of Yttrium Doped Barium Cerates..130(1-2)(2004)73-772004

    • Author(s)
      H.Maekawaら
    • Journal Title

      Solid State Commun. 130

      Pages: 73-77

    • Related Report
      2004 Annual Research Report
  • [Journal Article] High Proton Conductivity of Mesoporous Al_2O_3.2004

    • Author(s)
      H.Shenら
    • Journal Title

      The Science and Technology of Ions in Motion,(Eds. B.V.R.Chowdari, H.-L.Yoo, G.M.Choi, J.-H.Lee)(Solid State Ionics)

      Pages: 187-193

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Size dependent Ionic Conductivity Ovserved for Ordered-Mesoporous-Alumina-Ionic Conductor Composites.2004

    • Author(s)
      H.Maekawaら
    • Journal Title

      The Science and Technology of Ions in Motion,(Eds. B.V.R.Chowdari, H.-L.Yoo, G.M.Choi, J.-H.Lee)(Solid State Ionics)

      Pages: 851-857

    • Related Report
      2004 Annual Research Report
  • [Patent(Industrial Property Rights)] 高プロトン伝導材料とその製造方法2004

    • Inventor(s)
      前川 英己, 山村 力
    • Industrial Property Rights Holder
      科学技術振興機構
    • Filing Date
      2004-03-26
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 前川: "High temperature proton NMR study of yttrium doped barium cerates"Solid State Communications. 130. 73-77 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 前川: "Size Dependent Ionic Conductivity Observed for Ordered-Mesoporous Alumina-Lil Comnosite"Solid State Ionics. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 前川: "Enhanced Ionic Conduction Observed for Ordered Mesoporous Alumina-Ionic Conducotor Comnosite"MRS Symposium Proceedings. 756. EE6.18.1-EE6.18.8 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 前川: "Meso/macroporous inorganic oxide monoliths from polymer foams"Advanced Materials. 15. 591-596 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Mehmood: "Electro-deposition of tantalum on tungsten and nickel in LiF-NaF-CaF_2 melt containing K_2TaF_2-Flectrochemical study"Materials Transactions. 44. 259-267 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Mehmood: "Compact coating of tantalum on tungsten prepared by molten salt electrodenosition"Materials Transactions. 44. 1659-1662 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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