| Project/Area Number |
18510093
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanostructural science
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
OTOMO Toshiya High Energy Accelerator Research Organization, J-PARC Project Office, Associate Prof. (90270397)
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| Co-Investigator(Kenkyū-buntansha) |
TAKATA Shinichi Japan Atomic Energy Agency, Quantum Beam Science Directorate, 研究員 (70435600)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| 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)
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| Keywords | Diffusion 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 |
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| 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.
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