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Dynamic of water molecule in the nano-porous silica and its surface effect

Research Project

Project/Area Number 18510093
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nanostructural science
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

OTOMO Toshiya  High Energy Accelerator Research Organization, J-PARC Project Office, Associate Prof. (90270397)

Co-Investigator(Kenkyū-buntansha) TAKATA Shinichi  Japan Atomic Energy Agency, Quantum Beam Science Directorate, 研究員 (70435600)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,740,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsDiffusion constant / surface / interface / confined in nano-space / adsorbed water molecule / neutron scattering / diffraction / 放射線、X線、粒子 / 放射線、X線、粒子線
Research Abstract

In this research, an in-situ water adsorption system was constructed and neutron quasi-elastic had been performed. New information concerning adsorbed water molecule in the nano-porous silica (FSM) were obtained by analysis based on Jump Diffusion Model.
1) The dynamics of water molecules in the nano-pore can be analyzed by separating two types of molecules ; one is confined on the pore surface (monolayer water) and the other is free from the surface.
2) The diffusion constant (~10^<-9>m^2s^<-1>) and activation energy (~2.5kcal/mol) of the monolayer water are about half of bulk water.
3) The residential time before diffusion jumping is 5 times longer than bulk water.
4) The other water shows similar diffusion behavior (~2.7×10^<-8>m^2s^<-1> and ~4.7kcal/mol) to bulk water.
To understand the diffusion behavior in atomic level, neutron and X-ray diffraction had been performed. Diffraction profiles measured by in-situ adsorption technique show water adsorption behavior into the nano-pores but the structural analysis has not been finished yet. The glassy structure of FSM skeleton need to be investigated as well as controlling the content of hydrogen atoms and/or substitution to deuterium in the FSM. Inelastic scattering of FSM skeleton itself may be useful to understand the glassy structure.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (2 results)

All 2006

All Presentation (2 results)

  • [Presentation] メソポーラスシリカ内に吸着した水の構造とダイナミクス2006

    • Author(s)
      大友季哉
    • Organizer
      東京大学物性研究所 短期研究会
    • Place of Presentation
      茨城県東海村
    • Year and Date
      2006-10-25
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Dynamics and structural studies of adsorbed water molecule in meso-porous silica2006

    • Author(s)
      T.OTOMO, S.TAKATA, Y.Fukushima, Y.Inamura, O.Yamamuro, N.Setoyama, K.Itoh
    • Organizer
      Workshop of Institute of Solid State Physics, University of Tokyo
    • Place of Presentation
      Tokai, Japan
    • Year and Date
      2006-10-25
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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