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Analysis of the Effect of Phosphotungstic Acid Concentration on Its Radiation-Induced Reduction in Nanocomposites with Poly(Vinyl Alcohol)
Abstract
As a result of a detailed analysis of the previously discovered effect of the concentration of phosphotungstic acid (PTA) on its reduction in nanocomposite films with poly(vinyl alcohol) (PVA) under the influence of gamma radiation, it was established that the molar absorption coefficient at the maximum of PTA band caused by intervalence charge transfer in the reduced PTA heteropolyanions (HPA), at low PTA concentrations is 8 times higher than at high concentrations. Only 20% of this increase is due to the predominance of two- and one-electron-reduced HPAs at low and high concentrations, respectively. It is concluded that the main reason for the concentration effect is associated with a decrease in the size of PTA nanoparticles with decreasing PTA concentration in the films.
About the Authors
A. A. Gorbachev
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Minsk
O. N. Tretinnikov
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Minsk
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Review
For citations:
Gorbachev A.A., Tretinnikov O.N. Analysis of the Effect of Phosphotungstic Acid Concentration on Its Radiation-Induced Reduction in Nanocomposites with Poly(Vinyl Alcohol). Zhurnal Prikladnoii Spektroskopii. 2024;91(3):431-435. (In Russ.)
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