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1996 Fiscal Year Final Research Report Summary

Scanning Ripplon Microscopy

Research Project

Project/Area Number 06555019
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Applied physics, general
Research InstitutionUNIVERSITY OF TOKYO

Principal Investigator

TAKAGI Kenshiro  Institute of Industrial Science Professor, 生産技術研究所, 教授 (90013218)

Co-Investigator(Kenkyū-buntansha) SAKAI Keiji  Institute of Industrial Science Associate Professor, 生産技術研究所, 助教授 (00215584)
Project Period (FY) 1994 – 1996
KeywordsRipplon / Surface Tension wave / Light Scattering / Langmuir Film / Liquid Surface Physics / Two-dimensional Phase Transition / Phase Separation
Research Abstract

Langmuir film, a monolayr of molecules expanded on water surface, is important as a material for the LB film which has various industrial applications. The film shows phase transitions among two-dimensional gas, liquid and solid phases, and has attracted also a pure physical interest. In our previous studies we had established "Wide-band ripplon light scattering technique" for a non-contact measurement of ripplon, ie. high-frequency capillary waves thermally excited and propagating on water surface. This technique has been applied for investigating molecular dynamics in the Langmuir films ; local structure of the film, inhomogenuity and state of condensation have been revealed.
The purpose of the present study is to develop "a ripplon microscope" by increasing spatial resolution of this light scattering technique and combining it with a surface scanning system. It would be useful for quantitative evaluation of the films by measuring the surface energy and the surface visco-elasticity, the values which sensitively reflect the state of monomolecular layr on water surface. It would provide us with a very effective means for structure analysis of Langmuir films. We also intended to clarify how the function of a LB film is determined by the structure and dynamics of the Langmuir film as its material.
In this study we improved the signal processing and the optical system of the technique ; and constructed a surface scanning system. We succeeded in visualizing the surface structure with -10 mum spatial resolution and precision. We applied the new system for studying various effects of two-dimensional physics, including thermal expansion, and phase transitions. These results taught us an interesting fact two-dimensional substances also have critical phenomena as the more familiar three-dimensional ones, and their behavior is described within a framework of the mean field theory.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] N.Sakamoto,K.Sakai,K.Takagi: "Phase transition and critical behavior in Langmuir films of myristic acid" PHYSICAL REVIEW E. 53. 6164-6168 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hosoda,H.Kobayashi,N.Sakamoto,K.Sakai,K.Takagi: "Convergent ellipsometry around Brewster angle for quantitative evaluation of Langmuir films" REVIEW OF SCIENTIFIC INSTRUMENTS. 67. 4224-4227 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Sakamoto, K.Sakai, K.Takagi: "Phase transition and critical behavior in Langmuir films of myristic acid" PHYSICAL REVIEWE. 53. 6164-6168 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hosoda, H.Kobayashi, N.Sakamoto, K.Sakai, K.Takagi: "Convergent ellipsometry around Brewster angle for quantitative evaluation of Langmuir films" REVIEW OF SCIENTIFIC INSTRUMENTS. 67. 4224-4227 (1996)

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

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Published: 1999-03-09  

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