Abstract
Phase microscopy is used to show that the refractive index in the near-surface layer of water at the surface of a polymer Nafion membrane increases by a factor of 1.1 as compared to bulk water. Moreover, this layer exhibits birefringence. Experiments on UV irradiation of dry (anhydrous) and water-soaked Nafion are performed in grazing-incidence geometry to study their stimulated luminescence spectra. These spectra are found to be identical in both cases. For dry Nafion, luminescence can only be excited if probing radiation illuminates the polymer surface. The luminescence of water-soaked Nafion can also be excited if the distance between the optical axis and the surface is several hundred micrometers.
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Original Russian Text © N.F. Bunkin, V.S. Gorelik, V.A. Kozlov, A.V. Shkirin, N.V. Suyazov, 2014, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 146, No. 5, pp. 1051–1061.
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Bunkin, N.F., Gorelik, V.S., Kozlov, V.A. et al. Phase states of water near the surface of a polymer membrane. Phase microscopy and luminescence spectroscopy experiments. J. Exp. Theor. Phys. 119, 924–932 (2014). https://doi.org/10.1134/S106377611411003X
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DOI: https://doi.org/10.1134/S106377611411003X