کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5359547 1388248 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Attenuated total reflectance spectroscopy of coumarin organosilane molecules adsorbed on a fused silica surface
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Attenuated total reflectance spectroscopy of coumarin organosilane molecules adsorbed on a fused silica surface
چکیده انگلیسی
Attenuated total reflectance (ATR) spectroscopy was used to investigate the adsorption of coumarin organosilane molecules onto a fused silica surface. The difference between the absorption spectra of the molecules on the surface and in solution was explained by the interaction of the adsorbed coumarin organosilane molecules with the hydroxyl groups on the fused silica surface. This interaction produces a perturbation of the π electron distribution and the electronic transitions of the coumarin chromophore of the organosilane molecules adsorbed on the surface. From the kinetics adsorption curves, the calculated enthalpy values of 74.8 ± 5.2 kJ mol−1 and free energy of −38.22 ± 0.70 kJ mol−1 at 23 °C indicates a chemisorption process. The high sensitivity of ATR spectroscopy allows the detection of a monolayer formed by a 10 nM concentration of coumarin organosilane molecules, which covers more than half of the maximum surface coverage at 60 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 257, Issue 5, 15 December 2010, Pages 1792-1799
نویسندگان
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