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- W1995768345 abstract "The fluorescence characteristics of 5-dimethylaminonaphthalene-1-sulphonic acid (DNSA) were examined in a hydroxypropylcellulose (HPC) film as a function of the surrounding relative humidity (RH). When the RH changed from 0% to 87%, a red-wavelength shift in the maximum fluorescence wavelength (λmax) from 435 to 465 nm was observed, accompanying a decrease in the maximum fluorescence intensity. A plot of λmax against the water concentration in the film at different RHs was approximately linear, indicating that the λmax of DNSA can be used as a measure of the water vapour uptake in the film. Since the relative intensity at a fixed wavelength of 418 nm showed a monotonic decrease with increasing RH, the DNSA—HPC film can be applied as an optical RH sensor. Kinetic studies clarified that the response of the relative intensity to abrupt RH changes followed a first-order rate law. A small reduction in the fluorescence intensity of DNSA was found after repeated humidification and desiccation of the film, suggesting increasing association of the dye in the film during these processes." @default.
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- W1995768345 date "1993-04-01" @default.
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- W1995768345 title "Effect of humidity on the fluorescence properties of a medium- sensitive fluorophore in a hydrophilic polymer film" @default.
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- W1995768345 doi "https://doi.org/10.1016/1010-6030(93)85069-k" @default.
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