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Surface characterization of silanized glass fibers by labeling with environmentally sensitive fluorophores
Author(s) -
GonzalezBenito J.,
Cabanelas J. C.,
Aznar A. J.,
Vigil M. R.,
Bravo J.,
Baselga J.
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19961010)62:2<375::aid-app12>3.0.co;2-0
Subject(s) - silanization , dansyl chloride , triethoxysilane , chemistry , fluorescence , fourier transform infrared spectroscopy , analytical chemistry (journal) , aqueous solution , adsorption , fiber , pipette , solvent , chemical engineering , chromatography , organic chemistry , derivatization , optics , mass spectrometry , physics , engineering
Glass fibers have been treated with γ‐aminopropyl‐triethoxysilane (APES) through different silanizating procedures, which include APES aqueous solutions and APES vapor adsorption. Transmission Fourier transform IR (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 time‐resolved 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 to 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. © 1996 John Wiley & Sons, Inc.