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Classification of pre-dyed textile fibers exposed to weathering and photodegradation by non-destructive excitation-emission fluorescence spectroscopy paired with discriminant unfolded-partial least squares
摘要： Undyed textile fabrics such as Acrylic 864, Nylon 361 and Cotton 400 were pre-dyed with Basic Green 4 (BG4), Acid Yellow 17 (AY17) and Direct Blue 1 (DB1) dyes, respectively; and then exposed to two extremely diverse weather conditions in the United States: desert and humid environmental settings in Arizona (AZ) and Florida (FL) respectively, for different time intervals of exposure, which included 0, 3, 6, 9 and 12 months. After every interval of a 3 months period, ten fibers were uniformly sampled from each cloth piece, and fluorescence microscopy was employed to collect two-dimensional excitation and fluorescence spectra (2-D spectra) and three-dimensional (3D) excitation-emission matrices (EEMs). A significant loss of fluorescence intensity was observed upon fiber exposure to outdoor weathering conditions. For a comprehensive statistical data analysis and to be able to discriminate between any two single fibers weathered under different conditions, a multiway calibration algorithm known as discriminant unfolded partial least-squares (DU-PLS) method was applied to the exposed fibers. Results indicate that fluorescence spectroscopy combined with DU-PLS has the ability to appropriately classify and differentiate between any two pairs of dyed cotton or nylon fibers (acrylic in some cases) exposed to dry versus humid weather environments under different time intervals of exposure. These results provide the foundation for future studies towards a non-destructive approach capable to provide information on the weathering history of the fiber.
关键词： Discriminant unfolded partial least squares,Fiber analysis,Photodegradation,Excitation emission matrices,Weathering,Fluorescence spectroscopy
更新于2025-09-23 15:23:52
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AIP Conference Proceedings [AIP Publishing HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2019): Proceedings of the XXVI Conference on High-Energy Processes in Condensed Matter, dedicated to the 150th anniversary of the birth of S.A. Chaplygin - Novosibirsk, Russia (3–5 April 2019)] HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2019): Proceedings of the XXVI Conference on High-Energy Processes in Condensed Matter, dedicated to the 150th anniversary of the birth of S.A. Chaplygin - Investigation of the photobleaching effect on the measurement of laser-induced fluorescence excitation-emission matrices of biological tissues
摘要： Photobleaching effect on laser-induced fluorescence excitation-emission matrices of biological tissues was investigated. Rat brain tissues were used as an object of study. Tunable laser was used as an excitation source with wavelength in 210-290 nm range with 10 nm steps. The fluorescence spectra were measured depending on irradiation dose and wavelength. The photobleaching rate was estimated as an absorbed radiation dose when peak fluorescence intensity decreases 2.7 times. The above level of intensity decrease is achieved at absorbed dose of 58 mJ/cm2 for the 210 nm wavelength, and at 2550 mJ/cm2 for 290 nm. The highest absorbed dose (4333 mJ/cm2) and respectively the lowest bleaching rate falls on 250 nm. It had been shown that higher photobleaching rate at shorter wavelengths in general has negligible effect on the excitation-emission matrices measurements.
关键词： excitation-emission matrices,laser-induced fluorescence,photobleaching,biological tissues
更新于2025-09-11 14:15:04