1997 Fiscal Year Final Research Report Summary
STUDY ON GEL FILMS DOPED BY FUNCTIONAL DYES
| Project/Area Number |
07455356
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
有機工業化学
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| Research Institution | OSAKA PREFECTURE UNIVERSITY |
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Principal Investigator |
NAKAZUMI Hiroyuki OSAKA PREFECTURE UNIVERSITY COLLEGE OF ENGINEERING PROFESSOR, 工学部, 教授 (00109878)
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| Project Period (FY) |
1995 – 1997
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| Keywords | Sol-gel method / Photochromic gel films / Fluorescent gel films / Nano particles / Inorganic-organic dye hybrids / Alcohol sensor / Quart-resonator / Lightfastness |
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| Research Abstract |
Colored gel films, photochromic gel films, fluorescent gel films and a gel film for gas sensor were prepared by the solgel method using organic dyes and pigments or organically modified silicate for investigation of new advanced inorganic-organic dye hybrid thin films. Following conclusions were advanced as results of this project.
1. The colored thin gel film (thickness : 200-300nm) is formed on the surface of glass by the dip coating using sol precluded organic dyes and pigments into inorganic oxide matrices in sol-gel process. Many organic dyes and pigments, such as commercially available dyes and pigments, photochromic dyes, and fluorescent dyes and pigments, were incorporated into silica matrices. This new coating technology is useful for the coloration of glasses.
2. Photochromism of the gel films using spiropyran, spironaphtooxazine, and Malachite Green Leucocyanideis compared with that in sol under the conditions of acid catalyst. The reaction rate from the colored form to the spiro form of spiropyran and spironaphthooxazine in thin gel film is dependent on the gel matrix, which is influenced by the reaction time of the sol.
3. New organic-inorganic fluorescent thin gel films included with laser dyes or fluorescent organic pigments have been prepared. Fluorescence spectra, fluorescent quantum yield and lifetime of thin gel films are examined. Fluorescent peaks for most of dyes and pigments used in gel films were similar to those in solution and fluorescent lifetime for dyes and pigments used in gel films were 2.9-4.5 ns. Photostability of fluorescent gel films is dependent on fluorescent organic colorants used and/or silicate gel matrices.
4. Transient response curves for aromas from ethanol solution or several kinds of alcohols with different ethanol concentrations are observed using a sol-gel-film-coated quart crystal resonator gas sensor.
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