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Pseudo Phase Transition of Molecular Assembly in a Structure- Controlled Subnanospace Having Enhanced Potential.

Research Project

Project/Area Number 04453004
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理化学一般
Research InstitutionChiba University

Principal Investigator

KANEKO Katsumi  Chiba University Faculty of Science Professor, 理学部, 教授 (20009608)

Co-Investigator(Kenkyū-buntansha) SUZUKI Takaomi  Chiba University Faculty of Science Assistant Professor, 理学部, 助手 (20196835)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1993: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1992: ¥4,800,000 (Direct Cost: ¥4,800,000)
KeywordsNanospace / Molecular adsorption / SO_2 / Dipole-dipole interaction / Intermolecular interaction / Micropore / Phase transition / Activated carbon / 双極子 / イメージポテンシャル / 分子間相互作用 / 分子集団 / 二酸化硫黄 / 活性炭素繊維 / 吸着 / 吸着熱 / ミクロポアフィリング / サブナノ細孔
Research Abstract

Molecular states of SO_2, NO, N_2, CH_4, and H_2O in carbon subnanospaces of slit shape were studied by heat of adsorption, in situ X-ray diffraction, high pressure adsorption, and ordinary molecular adsorption. Supercritical NO gas was changed into quasi-vapor through formation of (NO)_2 due to strong molecular field of the subnanospace with the aid of magnetic perturbation. Also supercritical CH_4 and N_2 was transformed to their quasi-vapor due to the subnanospace field and application of high pressure of adsorptives. The structural change of H_2O molecular assembly in the subnanospace was examined by high resolution X-ray diffraction anaysis, indicating presence of a distorted two-dimensional ice like structure.
New phase transition of molecular assembly in the carbon nanospace was shown in the system of SO_2 and carbon slit pore of 0.8 nm width. The heat of SO_2 adsorption in the carbon subnanospace was divided into the constant region of enhanced potential field below phi=0.6 and an steep increase region above phi=0.6. The constant region was ascribed to enhanced SO_2-slit pore interactions (about 10 KJ/mol) including the induced dipole-permanent dipole interaction ; this indicated the parallel arrangement of dipoles of adsorbed SO_2 molecules. The steep increase was caused by the inter SO_2 molecular interaction which gives rise to conversion of the dipoles, forming the anti-parallel arrangement. The molecular potential calculation using the Lennard-Jones potential, the image potential approximation, and the Stockmayr potential supported this model. This orientation structure of the SO_2 dipoles in the carbon subnanospace depended on the micropore width ; in the greater carbon nanospace the above-mentioned steep transition was not observed. This research showed a new possibility of molecular chemistry controlled by the subnanospace field.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] K.Kaneko,R.Cracknell,D.Nicholson: "Nitrogen adsorption in slit pores at ambient temperatures:Comparison of simulation and experiment" Langmuir. 10(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Kaneko,C.Ishii,T.Arai,H.Suematsu: "Defect associated micropor us nature of C_<60> crystals" J.Phys.Chem.97. 6764-6766 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Kaneko,K.Murata,T.Suzuki: "Enhancement effect of micropore filling for supercritical methane by MgO dispersion" Langmuir. 9. 1165-1167 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Suzuki,K.Kaneko: "The micrographite growth of activated carbon fibers with high temperature treatment studied by computer-aided X-ray diffraction" Carbon. 31. 1360-1361 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.Fukazawa,K.Kaneko,C.D.Poon,E.T.Samulski: "Molewlar motion in micropore space by D-NMR in“Characterization of Porous Solids III"" J.Rouquerol編集(印刷中), (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Kaneko, R.Cracknell, and D.Nicholson: "Nitrogen adsorption in slit pores at ambient temperatures : Comparison of simulation and experiment." Langmuir. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.Fukasawa, K.Kaneko, C.D.Poon, and E.T Samulski: "Molecular motion in a micropore space by D-NMR" Characterization of Porous Solids III J.Rouquerol ed. Elsevier. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Kaneko, C.Ishii, T.Arai, and H.Suematsu: "Defect associated microporous nature of C_<60> crystals" J.Phys.Chem.97. 6764-6766 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Kaneko, K.Murata, and T.Suzuki: "Enhancement effect of micropore filling for supercritical methane by MgO dispersion" Langmuir. 9. 1165-1167 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Suzuki and K.Kaneko: "The micrographite growth of activated carbon fibers with high temperature treatment studied by computer-aided X-ray diffraction" Carbon. 31. 1360-1361 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Kaneko,R.Cracknell,D.Nicholson: "Nitrogen adsorption in slit pores atambient temperatures:Comparison of simulation and experiment" Langmuir. 10(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kaneko,C.Ishii,T.Arai,H.Suematsu: "Defect associated microporous nature of C_<60> crystals" J.Phys.Chem.97. 6764-6766 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kaneko,K.Murata,T.Suzuki: "Enhancement effect of micropore filling for supercritical metharce by MgO dispersion" Langmuir. 9. 1165-1167 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Suzuki,K.Kaneko: "The micrographite growth of activated carbonfibers with high temperature treatment studied by computer-aided X-ray diffroction" Carbon. 31. 1360-1361 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] J.Fukazawa,K.Kaneko,C.D.Poon,E.T.Samulski: "Characterization of Porous Solids III" Molewlarmotion in micropore space by D-NMR,

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kaneko: "Intrapore field dependent micropore filling of supercritical N_2 in slit-shaped micropores." J.Chem.Phys.98. 8705-8711 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Z.M.Wang: "Mixed valence oxide-dispersion induced micropore filing of surpercritical NO" J.Phys.Chem.96. 10917-10922 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Kaneko: "Origin of superhigh surface area and microcrystalline graphitic structures of adtivated carbons" Carbon. 30. 1075-1088 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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