Carbohydrate polymers · 2020
Hydrophobic up-conversion carboxylated nanocellulose/fluoride phosphor composite films modified with alkyl ketene dimer.
СтатьяНазвание и аннотация: Перевод в очереди
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Fedorov Pavel P, Luginina Anna A, Kuznetsov Sergey V, Voronov Valery V, Yapryntsev Alexey D, Lyapin Andrey A, Pynenkov Aleksandr A, Nishchev Konstantin N, Chernova Elena V, Petukhov Dmitriy I, Kuryakov Vladimir N, Gainutdinov Radmir V, Ivanov Vladimir K
Аннотация
Hydrophobic up-conversion nanocomposite films have been developed based on TEMPO-oxidized cellulose nanofibrils (TOCNF) modified with alkyl ketene dimer (AKD) as a matrix and MF2:Ho (M = Ca, Sr) as a phosphor. Fabrication of homogeneous, strong and translucent TOCNF/MF2:Ho-AKD films with water contact angle of 123 ± 2° was accomplished with mild drying at 110 °C. These hydrophobic nanocomposite films demonstrated stable up-conversion luminescence in the visible spectral range upon excitation of the 5I7 level of Ho3+ ions by laser irradiation at 1912 nm both under ambient conditions and in a humid atmosphere (92 ± 2% humidity). The absence of luminescence quenching in a high humidity atmosphere for TOCNF/MF2:Ho-AKD composite films was considered to be due to the reliable shielding effect of the hydrophobic TOCNF-AKD matrix. The films show promise for visualizing 2 μm laser radiation in medicine and monitoring of the atmosphere.