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Study on the alignment control of liquid crystalline molecules by photoisomerization reaction

Research Project

Project/Area Number 08405008
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

HATTA Aritada  Graduate School of Engineering, Tohoku University Professor, 大学院・工学研究科, 教授 (70005502)

Co-Investigator(Kenkyū-buntansha) SUZUKI Yushi  Graduate School of Engineering, Tohoku University Lecturer, 大学院・工学研究科, 講師 (50236022)
WADAYAMA Toshimasa  Graduate School of Engineering, Tohoku University Associate Professor, 大学院・工学研究科, 助教授 (20184004)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥12,500,000 (Direct Cost: ¥12,500,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1996: ¥7,500,000 (Direct Cost: ¥7,500,000)
Keywordsliquid crystal / photoisomerization / molecular alignment / surface / IR spectroscopy / molecular alignment control / Raman scattering / vibrational spectroscopies / 配向制御 / 振動スペクトル / ラマン分光
Research Abstract

The photoisomerization of self-assembled monolayer films of 4-(4'-(methoxyphenylazo)phenoxy)undecane- 1-thiol (AZO 11) on evaporated gold films was investigated by means of Raman scattering and UV-visible and IR absorption measurements. The trans * cis photoisomerization of the self-assembled AZO11 molecules were restricted in comparison to the isomerization of AZO11 in solutions. Moreover, the trans-to-cis isomerization was more suppressed than the cis-to-trans isomerization, as expected from the molecular cross section of cis AZO11 that is larger than trans AZO11. On this basis we propose that cis-form samples are on the whole more suitable for cis trans photoisomerization in order to control the molecular alignment of liquid crystals. This indeed was verified in our experiments where thin films of a nematic liquid crystal (4-cyano-4'-pentylbiphenyl : 5CB) were deposited on the cis and trans AZO11 surface layers. IR reflection absorption spectroscopy revealed that 5CB molecules tend to align with their long axes perpendicular to the plane of the trans AZO11 layer. However, this alignment was affected by UV irradiation due to partial conversion to cis isomer. This fact demonstrates that liquid crystal alignment can be controlled by changes in the molecular shape on the substrate surface. Similar IR measurements were performed on gold film surfaces covered with a mixture of adsorbed AZO11 and hexadecanethiol (C_<16>H_<33>SH). in this case the limitation of AZO11 photoisomerization was relaxed and a larger change in the liquid crystal alignment was observed. The utility of IR transmission and Raman scattering measurements on silver island films was also demonstrated.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Wadayama: "Real-time photoluminescence and Raman spectral study of porous Si during F_2 and H_2O exposure" J.Luminescence. 78巻. 111-116 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Yamatake: "Raman spectroscopic study of iron pentacarbonyl on Silver at elevated temperatures" J.Raman Spectrpscopy. 29巻. 781-785 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Wadayama: "Change in luminescence properties of porous Si by F_2 and D_2O exposure : In situ photoluminescence, Raman, and Fourien-transform infrared spectral study" Applied Physics Letters. 73巻. 2570-2572 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tanabe: "Carbon monoxide adsorption on the ultrathin Fe film deposited on Cu(100)" Surface Science. in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Suzuki: "Enhancement of the infrared absorption of methanol adsorbed on silver island films" Surface Science. in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Suzuki: "Thickness dependence of infrared absorption enhancement for methanol on evaporated silver films" Surface Science. in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Wadayama: "Real-time photoluminescence and Raman spectral study of porous Si during F_2 and H_2O exposure" J.Lumin. vol.78. 111-116 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Yamatake: "Raman spectroscopic study of iron pentacarbonyl on silver at elevated temperatures" J.Raman Spectrosc. vol.29. 781-785 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Wadayama: "Change in luminescence properties of porous Si by F_2 and D_2O exposure : In situ photoluminescence, Raman, and Fourier-transform infrared spectral study" Appl.Phys.Lett.vol.73. 2570-2572 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tanabe: "Carbon monoxide adsorption on the ultrathin Fe film deposited on Cu (100)" Surf.Sci.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Suzuki: "Enhancement of the infrared absorption of methanol adsorbed on silver island films" Surf.Sci.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Suzuki: "Thickness dependence of infrared absorption enhancement for methanol on evaporated silver films" Surf.Sci.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary

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Published: 1996-04-01   Modified: 2016-04-21  

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