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- W2023977246 abstract "This work presents results for the temperature dependence of the photobleaching reactions of Fluorescein dissolved in poly (vinyl alcohol) (PVA) irradiated by a continuous 150 W Hg high pressure arc lamp. We observed that the photobleaching process efficiency is dependent on: lamp power, dye concentration and temperature. Although the photobleaching processes can only be described by a single-exponential function for lower concentration samples, a biphasic model must be employed for intermediate concentrations, resulting in one slower and one faster processes, while, for higher concentration samples, even multiple-exponential functions are unable to tit the experimental data. This complex behavior is probably due to the co-existence of many different types of energy transfer and photochemical processes with different rate constants. Therefore, a model based on a sequential distribution of site occupation by the dye molecules in the matrix, controlled by dyepolymer interaction strengths, is proposed to explain the complex-exponential kinetic behavior. Moreover, photobleaching process efficiency- is somewhat increased by temperature and, above the PVA glass transition temperature, Tg, (350 K), it follows a first order kinetics, fitted by a mono-exponential function." @default.
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- W2023977246 date "1998-03-01" @default.
- W2023977246 modified "2023-10-03" @default.
- W2023977246 title "Dye-polymer interactions controlling the kinetics of fluorescein photobleaching reactions in poly(vinyl alcohol)" @default.
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- W2023977246 doi "https://doi.org/10.1016/s1010-6030(97)00307-9" @default.
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