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1991 Fiscal Year Final Research Report Summary

Study of Photophysical Process and Photocatalytic Activity of Anchored Catalyst Prepared by thev Sol-Gel Method

Research Project

Project/Area Number 02805099
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 工業物理化学・複合材料
Research InstitutionShinshu University

Principal Investigator

FUJII Tsuneo  Shinshu University, Fac. Engi., Assoc. Professore, Col. Engi., Professor, 工学部, 助教授 (10092892)

Co-Investigator(Kenkyū-buntansha) ANPO Masakazu  Univ. Osaka Prefecture, Col. Engi., Professor, 工学部, 教授 (70094498)
Project Period (FY) 1990 – 1991
KeywordsSol-Gel Method / Mixed Metal Oxides / Photocatalyst / Photophysics / Anchored Catalyst / Fluorescence Spectra / Photo CVD / Photoprobe
Research Abstract

The absortion, fluorescence, and fluorescence-excitation spectra of some aromatic photoprobe molecules(l-naphthol, benzoqunolines, rhodamine VB, fluorescein, and pyrene)have been observed along with the progress of the sol-gel reaction of SI-AI and Si-Ti mixed alkoxides. The spectral changes during the sol-gel process reflected the changes of the polarity, microviscosity, and other chemical and physical properties around the photoprobes of the reaction specimes. In a case of small fraction of AI, gelation occurred relatively slow and polarity and microviscosity around the photoprobe molecules increased relatively fast. On the other hand, the reverse chemical and physical phenomena are observed in a case of large fraction of AI. In a case of acid catalyst, hydrolysis proceeded fast and the rate determing reaction is condensation step. On the other hand, in a case of basic catalyst, the condensation proceeds fast and the rate determining step is hydrolysis. Observation of the fluorescence spectra of aromatic molecules is a useful photophysical and photochemical probe for studying the sol-gel-xerogel transition of metal alkoxides on a molecular level.
The thermal stability, similar to the photostability, of aromatic molecules encapsulated in xerogel state prepared by the sol-gel method is one of the important point for the utility of functional materials. We found that the encapsulated rhodamine B and fluorescein molecules have increased thermal stability than in air circumstance. This enhancement can be sttributed to the prevention of the permeation of oxygen into the pores of the prepared silica gel.
Excimer-like fluorescence of pyrene during the sol-gel reaction disappeared before gelation, but the fluorescence intensity became strong in encapsulated state into pores of the Si-Ti and SI-AI. This striking phenomenon can be attributable to the adsorption of two molecules at Ti site and 1 : 1 complex formation between aromatic molecules and AI.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Tsuneo FUJII,Akira ISHII,and Masakazu ANPO: "Absorption and Fluorescence Spectra of Rhodamine B Molecules Encapsulated in Silica Gel Networks and Their Thermal Stability" J.Photochem.Photobiol.A:Chem.,. 54. 231-237 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.FUJII,O.KAWAUCHI,Y.KURIHARA,A.ISHIIN.NEGISGISHI,and M.ANPO: "Enhancement of Thermal Stability of Fluorescein Molecules Encapsulated into Silica Gel Notworks by Sol-Gel Method" Chem.Express,. 5. 917-920 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.FUJII,H.KITAMURA,S.KAWAUCHI,T.MABUCHI and N.NEGISHI: "Study of 1-Naphthol as a Fluorescent Probe for the Sol to Gel to Xerogel Reaction of Mixed Sluminium and Silicon Systems" J.Photochem.Photobiol.A:Chem.,. 61. 365-372 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuneo FUJII,Akira ISHII,and Masakazu ANPO: "Fluorescence Spectra and Chemical Sopecies of Fluorescein Molecules Adsorbed in a Calcinated Vycor Glass" Res.Chem.Intermed.,. 17. 1-17 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuneo FUJII and Hirofumi MIYOSHI: "Quenching of Monomer and Excimer Fluorescences of Pyrene by NaI Adsorbed on Filter Paper" Chem.Express,. 6. 451-454 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuneo FUJII,Hirofumi MIYOSHI and Kyouichi OKI: "Monomer and Excimer-like Fluorescence Quenching of Pyrene by Alkali Halides Adsorbed on Filter Paper" Chem.Express,. 7. 5-8 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.FUJII,T.MABUCHI H.KITAMURA,O.KAWAUCHI,N.NEGISHI and M.ANPO: "Fluorescence Spectra of 1-Naphthol During the Sol-Gel Process of a Mixed Aluminum-Silicon Alkoxide (Si:Al = 94:6)" Bull.Chem.Soc.Jpn.,. 65. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.FUJII,H.YAMAMOTO Y.Yobiko and M.ANPO: "Fluorescence Spectra of Methyl Salicylate Along Sol-Gel Transition of Si-Al Mixed Metal Alkoxides"

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.NEGISHI,M.ANPO,T.FUJII and K.MURAYAMA: "Abnormal Changes of Fluorescence Spectra of Pyrene in Si-Ti Binary systems During Their Sol- Gel- Xerogel Transition"

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.FUJII: "Encapsulation of Organic Dyes by Sol-Gel Method and Preparation of Solid State Dye-Laser"

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. FUJII, A. ISHII, and M. ANPO: "Absorption and Fluorescence Spectra of Rhodamine B Molecules Encapsulated in Silica Gel Networks and Theri Thermal Stability" J. Photochem. Photobiol. A : Chem.17. 231-237 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII, O. KAWAUCHI, Y. KURIHARA, A. ISHII N. NEGISHI, and M. ANPO: "Enhancement of Termal Stability of Fluorecein Molecules Encapsulated into Silica Gel Networks by Sol-Gel Method" Chem. Express.5. 917-920 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII, H. KITAMURA, S. KAWAUCHI, T. MABUCHI, and N. NEGISHI: "Study of 1-Naphthol as a Fluorescent Probe for the Sol to Gel to Xerogel Reaction of Mixed Aluminium Silicaon Systems" J. Photochem. Photobiol. A : Chem.61. 365-372 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII, A. ISHII, and M. ANPO: "Fluorescence Spectra and Chemical Species of Fluorescein Molecules Adsorbed in a Calcinated Vycor Glass" Res. Chem. Intermed.17. 1-17 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII and H. MIYOSHI: "Quenching of Monomer and Excimer Fluorescences of Pyrene by NaI Adsorbed on Filter Paper" Chem. Express. 6. 451-454 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII, H. MIYOSHI, and K. OKI: "Monomer and Excimer-like Fluorescence Quenching of Pyrene by Alkali Halides Adsorbed on Filter Paper" Chem. Express. 7. 5-8 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII, T. MABUCHI, H. KITAMURA, O. Kawauchi, N. NEGISHI, and M. ANPO: "Fluorescence Spectra of 1-Naphthol During the Sol-Gel Process of a Mixed Aluminum-silicon Mixed Metal Alkoxides" Bull. Chem. Soc. Jpn.65(3). (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII, H. YAMAMOTO, Y. YOBIKO, and M. ANPO: "Fluorescence Spectra of Methyl Salicylate Along Sol-Gel Transition of Si-Al Mixed Metal Alkoxides"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. NEGISHI, M. ANPO, T. FUJII, and K. MURAYAMA: "Abnormal Changes of Fluorescence Spectra of Pyrene in Si-Ti Binary Systems During Their Sol-Gel- Xerogel Transition"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. FUJII: "Encapsulation of Organic Dyes by Sol-Gel Method and Preparation of Solid State Dye-Laser"

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

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Published: 1993-03-16  

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