Surface characterization of silanized glass fibers by labeling with environmentally sensitive fluorophores
✍ Scribed by J. Gonzalez-Benito; J. C. Cabanelas; A. J. Aznar; M. R. Vigil; J. Bravo; J. Baselga
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 779 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Glass fibers have been treated with y-aminopropyl-triethoxysilane (APES) through different silanizating procedures, which include APES aqueous solutions and APES vapor adsorption.
Transmission Fourier transform I R (FTIR) measurements have been performed on the silanized samples to characterize the silanization reaction. Dansyl-sulfonamide conjugates have then been formed by reaction of dansyl chloride in dimethylformamide solution with the amine functionality's immobilized on the glass fiber surface. Steady-state and timeresolved fluorescence measurements have been performed on dansylated samples. A dependence of the fluorescence intensity and the wavelength of the maximum emission on the silanization procedure has been observed. Good fits of the fluorescence decays of dansyl labels are found when biexponential functions are used for deconvolution, whereas the decay of dansylamides in fluid solution is single exponential. A two-state model for the solid solvent relaxation seems t o apply for this samples. Several surface structural changes produced by the different silanization methods have been proposed. FTIR results support the conclusions drawn from fluorescence measurements. C3 1996 .