RT Journal Article
T1 Surface Characterization of Silanized Glass Fibers by Labeling with Environmental Sensitive Fluorophores
A1 González Benito, Francisco Javier
A1 Cabanelas Valcárcel, Juan Carlos
A1 Aznar Jiménez, Antonio
A1 Vigil Montaño, Maria Reyes
A1 Bravo de Pedro, Julio
A1 Baselga Llidó, Juan
AB Glass fibers have been treated with gamma-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.
PB Wiley
SN 0021-8995
YR 1996
FD 1996-10-10
LK http://hdl.handle.net/10016/25789
UL http://hdl.handle.net/10016/25789
LA eng
NO Financial support for this work has been provided by Comision Interministerial de Ciencia y Tecnologia (Cl­ CYT) , under grant MAT93-0823, and by Comunidad Autónoma de Madrid (CAM) , under grant 247 / 92. We thank Dr. I. Pierola for her comments and suggestions.
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RD 27 abr. 2024