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Korchev AS, Konovalova T, Cammarata V, et al. Radical-induced generation of small silver particles in SPEEK/PVA polymer films and solutions: UV-Vis, EPR, and FT-IR studies. Langmuir. 2006;22(1):375-84doi: 10.1021/la0512345.
Korchev, A. S., Konovalova, T., Cammarata, V., Kispert, L., Slaten, L., & Mills, G. (2006). Radical-induced generation of small silver particles in SPEEK/PVA polymer films and solutions: UV-Vis, EPR, and FT-IR studies. Langmuir : the ACS journal of surfaces and colloids, 22(1), 375-84. https://doi.org/10.1021/la0512345
Korchev, A S, et al. "Radical-induced generation of small silver particles in SPEEK/PVA polymer films and solutions: UV-Vis, EPR, and FT-IR studies." Langmuir : the ACS journal of surfaces and colloids vol. 22,1 (2006): 375-84. doi: https://doi.org/10.1021/la0512345
Korchev AS, Konovalova T, Cammarata V, Kispert L, Slaten L, Mills G. Radical-induced generation of small silver particles in SPEEK/PVA polymer films and solutions: UV-Vis, EPR, and FT-IR studies. Langmuir. 2006 Jan 03;22(1):375-84. doi: 10.1021/la0512345. PMID: 16378448.
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Langmuir. 2006 Jan 03;22(1):375-84. doi: 10.1021/la0512345.

Radical-induced generation of small silver particles in SPEEK/PVA polymer films and solutions: UV-Vis, EPR, and FT-IR studies.

Langmuir : the ACS journal of surfaces and colloids

A S Korchev, T Konovalova, V Cammarata, L Kispert, L Slaten, G Mills

Affiliations

  1. Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA.

PMID: 16378448 DOI: 10.1021/la0512345

Abstract

The present study is centered on the processes involved in the photochemical generation of nanometer-sized Ag particles via illumination at 350 nm of aqueous solutions and cross linked films containing sulfonated poly(ether ether ketone) and poly(vinyl alcohol). Optical and electron paramagnetic resonance experiments, including electron nuclear double resonance data, proved conclusively that the photogenerated chromophore exhibiting a band with lambda(max) = 565 nm is an alpha-hydroxy aromatic (ketyl) radical of the polymeric ketone. This reducing species was produced by illumination of either solutions or films, but the radical lifetime extended from minutes in the fluid phase to hours in the solid. Direct evidence is presented that this long-lived chromophore reduces Ag(I), Cu(II), and Au(III) ions in solution. A rate constant of k = 1.4 x 10(3) M(-)(1) s(-)(1) was obtained for the reduction of Ag(+) by the ketyl radical from the post-irradiation formation of Ag crystallites. FTIR results confirmed that the photoprocess yielding polymeric ketyl radicals involves a reaction between the macromolecules. The photochemical oxidation of the polymeric alcohol, as well as the formation of light-absorbing macromolecular products and polyols, indicates that the sulfonated polyketone experienced transformations similar to those encountered during illumination of the benzophenone/2-propanol system.

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