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Development of Totally Reflected Forced Bayleigh Scattering System and its Application to Molecular Diffusion near Liguid Crystal Substrate Surface

Research Project

Project/Area Number 04555013
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理計測・光学
Research InstitutionTokyo Institute of Technology

Principal Investigator

TAKEZOE Hideo  Tokyo Institute of Technology Department of Organic and Polymeric Materials Professor, 工学部, 教授 (10108194)

Co-Investigator(Kenkyū-buntansha) KAJIKAWA Kotaro  Research Associate Present Address Riken, Research Scientist, 工学部, 助手 (10214305)
高西 陽一  東京工業大学, 工学部, 助手 (80251619)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1993: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordstotal reflection / Forced Rayleigh scattering / interface / liquid crystal / diffusion / 拡散定数 / ネマティック液晶 / 強制レーリ散乱 / 基板
Research Abstract

FRS is a kind of microscopic tracer method based on transient grating (interference fringe ) technique using writing Ar^+ laser beams and a probing He-Ne laser beam. We can determine thediffusion constant of tracer molecules in host liquid crystals accurately and quickly. For the determination of diffusion constants near surface area, i.e., TFRS,we used a total reflection prism as one of a cell surface and the probing beam under a condition of total internal reflection.
A preliminary experiment was made for a nematic liquid crystal, 4'-n-pentyl-4-cyanobiphenyl ( 5CB ) . We found that the bulk diffusion shows a nearly single exponential decay. On the other hand, the surface diffusion includes a faster decay component in addition to a decayas same as that of the bulk diffusion. Thus, the surface diffusion is rather faster than the bulk one. Possible explanation is as follows : Surface roughness introduces disorder of molecular alignment and various kinds of defects, which accelerate the diffusion motion. This kind of phenomenon is well known in self-diffusion and impurity diffusion in metals.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] A.Fukuda,T.Moriyama and H.Takezoe: "Chevron Layer Structure in Smectic Liquid Crystals and Molecular Diffusion near Glass Suface"" New Functionality Materials,Volume C,Synthetic Process and Control of Functionality Materials(Elsevier Science Pub.). 723-728 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Moriyama,Y.Takanishi,K.Ishikawa,H.Takezoe and A.Fukuda: "Binary Mass Diffusion in Smectic C and CA Phases as Observed by Forced Rayleigh Scattering" LIq.Cryst.18(印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.Fukuda, T.Moriyama and H.Takezoe: "Chevron Layr Structure in Smectic Liquid Crystals and Molecular Diffusion near Glass Surface" New Functionality Materials, Volume C,Synthetic Process and Control of Functionality Materials ( Elsevier Science Pub.). 723-728

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Moriyama, Y.Takanishi, K.Ishikawa, H.Takezoe and A.Fukuda: "Binary Mass Diffusion in Smectic C and CA Phases as Observed by Forced Rayleigh Scattering"" Liq.Cryst. ( in press ).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary

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Published: 1992-04-01   Modified: 2016-04-21  

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