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Wetting Phenomena of Mercury near the critical point

Research Project

Project/Area Number 09440135
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

YAO Makoto  Graduate School of Science, KYOTO UNIVERSITY Associate Professor, 大学院・理学研究科, 助教授 (70182293)

Co-Investigator(Kenkyū-buntansha) CHMASA Yoshinori  Graduate School of Science, KYOTO UNIVERSITY Assistant, 大学院・理学研究科, 助手 (30301229)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
Keywordsmercury-sapphire interface / wetting / critical point / prewetting transition / optical reflectivity / ellipsometry / thermal radiation intensity / critical fluctuation / 水銀 / サファイア / 濡れ転移 / 高温高圧 / 界面現象 / 液体-気体臨界点 / 金属-非金属転移 / ファイア / 偏光解析法 / スピーノ-ダル分解
Research Abstract

It is well known that liquid mercury is a non-wetting substance on solid non-metallic substrate under the ambient conditions. Indeed the closest example in common experience of a non-wetting substance is a mercury drop on a glass plate. However, at high temperatures and high pressures close to the liquid-vapor critical point of mercury, we found that sapphire substrate is wetted with mercury. This change from non-wetting to wetting takes place as a 1st order phase transition, and is called a wetting transition.
In the present study, we tried to develop the above study further. We invented a new experimental technique for ellipsometric measurements, which can be applied to high temperature and high pressure conditions. By using this technique, we succeeded in determining important physical quantities, such as coverage Γ, which is the order parameter of the wetting transition. This technique makes us possible to study the physical properties of the wetting layer as an two-dimensional liqu … More id, and we concluded that the wetting layer has semiconducting properties. This result gives important information on the problem why the sapphire substrate is wetted by mercury. In addition, we found that the wetting phenomena can also be detected by measuring the thermal radiation intensity. Indeed, a sharp dip in the thermal radiation intensity is observed in the prewetting supercritical region, where the two-dimensional compressibility (αΓ/αμ)ィイD2τィエD2 is expected to show a maximum due to the critical fluctuations. Here μ is the chemical potential.
As stated above, we invented new experimental techniques, by which we can determine experimentally both the mean values and the fluctuations of physical quantities characterizing the wetting phenomena with high accuracy. These techniques are expected to be applied not only to sapphire-mercury system but also to other systems. The results of the present research project are reported in "Adriatico research conference on wetting" (Treste, Italy) as an invited lecture. The head investigator of the present research project organized a symposium on "wetting phenomena" in the meeting of the physical society of Japan for the first time. Less

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 大政義典: "Ellipsometric Study of the Prewetting Transition at Menury-Sapphire Interface"J. Phys Condensed Matter. 10. 11589-11594 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 大政義典: "Wetting Phenomena at Mercury-Sapphire Interface under High Temperature and pressure"J. Non-Cryst. Solids. 250-252. 209-213 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 大政義典: "Wetting Phenomena at Mercury on Sapphire by Cptical Emissiuity Measurement"J. Phys Condensed Matter. 12. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Ohmasa: "Ellipsometric Study of the Prewetting Transition at Mercury-Sapphire Interface"J.Phys. Condensed Matter. 10. 11589-94 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Ohmasa: "Wetting Phenomena at Mercury-Sapphire Interface under High Temperature and Pressure"J.Non-Cryst. Solids. 250-252. 209-213 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Ohmasa: "Wetting Phenomena of Mercury on Sapphire Studied by Optical Emissivity Measurement"J. Phys. Condnes. Matter. 12. A375-A381 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 大政義典: "Wetting Phenomena at Mercury-Sapphire Interface under High Temperature and Pressure"J. Non-Cryst. Solids. 250-252. 209-213 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 大政義典: "Wetting Phenomena of Mercury on Sapphire Studied by Optical Emissivity Measurement"J. Phys. Condens. Matter. 12. A375-A381 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Ohmasa et al.: "Ellipsometric Study of the Prewetting Transition at Mercury-Sapphire Interface" J.Phys.Condensed Matter. 10. 11589-11594 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Yao et al.: "Dynamics in Supercritical Fluid Water" J.Phys.Condensed Matter. 10. 11459-11468 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] F.Hensel et al.: "Wetting Phenomena Near the Bulk Critical Point of Fluid Mercury" Ber.Bunsenges.Phys.Chem.102. 1798-1802 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Okada et al.: "Dielectric Relaxation of Water and Heavy Water in the Whole Fluid Phase" J.Chem.Phys.110. 3026-3036 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Ohmasa et al.: "Wetting Phenomena at Mercury-Sapphire Interface under High Temperature and Pressure" J.Non-Cryst.Solids. (印刷中).

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Yao: "Landolt-B(rnstein, New Series III/41, Chap.9.1.IAx-IBy Compounds" Springer Verlag, 12 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 八尾 誠: "Quassielastic Neutron Scattering of Liquid A2X2 (A : Chalcogen,x : Halogen)" J.Phys.Soc.Jpn.66. 3115-3119 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] F.Hensel: "Prewetting Phase Diagram of Mercury on Sapphire" Europ.J.Solid State Inorg.Chem.34. 861-870 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 八尾 誠: "Dielectric Relaxation in Supercritecal Water" The Review of High Pressure and Science and Technology. 7(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 岡田 一夫: "Sound Velocity and Attenuation of Supercritical Mercury" The Review of High Pressure and Science and Technology. 7(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大政 義典: "ESR Study of Pressure-quenched Monoclinic Te0.4 Se0.6" J.Phys.Soc.Jpn.66. 684-689 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 川北 至信: "Electronic and Atomic Structures of Liquid Tellurium Containing Alkali Elements" J.Phys.Soc.Jpn.66. 1339-1350 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 八尾 誠: "Landolt-Bornstein,New Series III/41,Chap.9.1 IAx-Iby Compounds" Springer Verlag (Berlin) (印刷中),

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2020-05-15  

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