• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2002 Fiscal Year Final Research Report Summary

Structure and Dynamics of Vapor-deposited Aqueous Solution Glasses

Research Project

Project/Area Number 13640382
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物性一般(含基礎論)
Research InstitutionOsaka University

Principal Investigator

YAMAMURO Osamu  Osaka University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 講師 (20200777)

Project Period (FY) 2001 – 2002
KeywordsGlass / Aqueous solution / Low-energy excitation / Neutron scattering / Hydrogen bond / Hydrophobic hydration
Research Abstract

In order to clarify the origin of the low energy excitation of glasses, which is one of the important problems in the physics of disordered systems, we have measured the neutron scattering and heat capacity of glassy water and several aqueous solution glasses. Two different types of solutes were taken for this study; one is well-solved solute CD_3OH and the other is less-solved solute Xe and SF_6. CD_3OH may have the effect destroying hydrogen-bond network, and Xe and SF_6 forming hydrogen-bond network through the hydrophobic hydration forming cage-like local structure. Both glasses were prepared by the low-temperature vapor-deposition technique which was developed by us.
At the beginning of the study, we have measured the neutron diffraction and small angle scattering of glassy water (solvent of the present systems) and SF_6 solution glass. Annealing the samples around 120 K, which is ca. 10 K lower than the glass transition temperature, reduced average mass density and density fluctuation around 0.1 Å^<-1>. Then we measured inelastic neutron scattering of the CD_3OH, Xe and SF_6 aqueous solution glasses with several concentrations. CD_3OH increased the intensity of the low-energy excitation while Xe and SF_6 reduced the intensity. These effects were enhanced by the increase of solute concentration. Annealing around 120 K also reduced the intensity of the low-energy excitation. By combining all of the present results, we have concluded that the origin of the low energy excitation of hydrogen-bonded network glasses is the nano-scale disorder and distortion due to partially broken hydrogen bonds.
At present, the above results have been published in five international journals, We had good response in all of the eight (four overseas and four domestic) international meetings where the present results were reported.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] O.Yamamuro: "Low-Energy Excitations of Vapor-Deposited Amorphous Ice and Its Annealing and Methanol-doping Effects Studied by Inelastic Neutron Scattering"J.Chem.Phys.. 115. 9808-9814 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamuro: "Boson Peaks in Hydrogen-bonded Molecular Glasses"Physica B. 311. 84-89 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Madokoro: "Calorimetric and Neutron Scattering Studies on Boson Peak of Lithium Chloride Aqueous Solution Glasses"J.Chem.Phys.. 116. 5673-5679 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamuro: "Inelastic Neutron Scattering and Low-energy Excitation of Amorphous SF_6-hydrate Prepared by Vapor-deposition Technique"Can.J.Phys.. 81. 107-114 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamuro: "Neutron Diffraction and Thermal Studies of Amorphous CS_2 Realised by Low-temperature Vapour deposition"Europhys.Lett.. 63. 368-373 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamuro: "Calorimetric and Neutron Scattering Studies of Plastically Crystalline Cyclooctanol"J.Phys. : Cond.Matter. 15. 5439-5450 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamuro: "Low-Energy Excitations of Vapor-Deposited Amorphous Ice and Its Annealing and Methanol-doping Effects Studied by Inelastic Neutron Scattering"J.Chem.Phys.. 115. 9808-9814 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Yamamuro: "Boson Peaks in Hydrogen-bonded Molecular Glasses"Physica B. 311. 84-89 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Madokoro: "Calorimetric and Neutron Scattering Studies on Boson peak of Lithium Chloride Aqueous Solution Glasses"J.Chem.Phys.. 116. 5673-5679 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Yamamuro: "Inelastic Neutron Scattering and Low-energy Excitation of Amorphous SF_6-hydrate Prepared by Vapor-deposition"Can.J.Phys.. 81. 107-114 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Yamamuro: "Neutron Diffraction and Thermal Studies of Amorphous CS_2 Realized by Low-temperature Vapor-deposition"Europhys.Lett.. 63. 368-373 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Yamamuro: "Calorimetric and Neutron Scattering Studies of Plastically Crystalline Cyclooctanol"J.Phys.:Cond.Matter. 15. 5439-5450 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2005-04-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi