Time dependence of the luminescence from a polymer membrane swollen in water: Concentration and isotopic effects
The effect of UV irradiation of the surface of a Nafion polymer electrolyte membrane swollen in water in the pump grazing incidence geometry has been experimentally investigated. The photoluminescence from the Nafion surface has been measured in the spectral range characteristic of this polymer. The photoluminescence signal from a polymer with a variable isotopic composition is found to be sensitive to swelling in water. The spectral absorption lines of dry and water-swollen Nafion samples are characterized. It is shown that the luminescence centers in the polymer are sulfonic acid groups located on the ends of perfluorovinyl ether groups, which form the teflon base. Measurements of the temporal dynamics of the luminescence of these groups have revealed an informationally important and significant dependence of the luminescence parameters on the degree of Nafion swelling. A pronounced and nontrivial dependence of these parameters on the content of heavy isotope D2O in water is also found.
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- 14.G. H. Pollack, The Fourth Phase of Water (Ebner and Sons Publ., Seattle, 2013).Google Scholar
- 21.S. V. Gudkov, M. E. Astashev, V. I. Bruskov, V. A. Kozlov, S. D. Zakharov, and N. F. Bunkin, “Self-Oscillating Water Chemiluminescence Modes and Reactive Oxygen Species Generation Induced by Laser Irradiation; Effect of the Exclusion Zone Created by Nafion,” Entropy. 16, 6166 (2014).ADSCrossRefGoogle Scholar
- 29.J. F. Thomson, Biological Effects of Deuterium (Pergamon, N. Y., 1963).Google Scholar
- 30.T. Kihara and J. A. McCray, “Water and Cytochrome Oxidation-Reduction Reactions,” Biochem. Biophys. Acta. 292(2), 297 (1973).Google Scholar
- 33.T. Strekalova, M. Evans, A. Chernopiatko, Y. Couch, J. Costa-Nunes, R. Cespuglio, L. Chesson, J. Vignisse, H. W. Steinbusch, D. C. Anthony, I. Pomytkin, and K. P. Lesch, “Deuterium Content of Water Increases Depression Susceptibility: The Potential Role of a Serotonin-Related Mechanism,” Behav. Brain Res. 277, 237 (2015).CrossRefGoogle Scholar
- 34.V. Vasilescu and D. Muargineanu, “The Role of Water in Biological Membrane Phenomena As Revealed by Deuterium Isotope Effects,” Rev. Roum. Physiol. 11(2), 167 (1974).Google Scholar
- 35.V. Vasilescu, E. Katona, A. Popescu, C. Zaciu, and C. Ganea, “Some Problems Concerning the Role of Water and Protons in the Function of Biological Membranes,” in Membrane Processes. Molecular Biology and Medical Applications, Ed. by G. Benga, H. Baum, and F. A. Kummerow (Springer, N. Y., 1984).Google Scholar
- 39.www1. lsbu. ac. uk/water/water−vibrational−spectrum. htmlGoogle Scholar
- 40.E. I. Den’ko, “Effect of Heavy Water (D2O) on Animal and Plant Cells and on Microorganisms,” Usp. Sovrem. Biol. 70(1), 41 (1970) [in Russian].Google Scholar
- 42.A. B. Lisicin, A. S. Didikin, L. V. Fedulova, I. M. Chernukha, M. G. Baryshev, E. E. Tekutskaya, S. S. Dzhimak, A. A. Basov, E. V. Barysheva, I. M. Bikov, and A. A. Timakov, “Influence of Deuterium Depleted Water on the Organism of Laboratory Animals in Various Functional Conditions of Nonspecific Protective Systems,” Biophysics. 59(4), 620 (2014).CrossRefGoogle Scholar
- 43.R. Rehakova, J. Klimentova, M. Cebova, A. Barta, Z. Matuskova, P. Labas, and O. Pechanova, “Effect of Deuterium-Depleted Water on Selected Cardiometabolic Parameters in Fructose-Treated Rats,” Physiol. Res. 65, S401 (2016).Google Scholar