ESR studies on oxygen diffusion

C. Stradowski, Methylviologen cation radical as probe of oxygen diffusion through polymer, J. Appl. Polym. Sci., 1990, 41, 2511 B. Maiti and S. Schlick, Oxygen permeation in perfluorinated ionomers based on the reaction with the methylviologen cation radical. An ESR and optical study, Chem. Mater., 1992, 4, 458. 

Ally alcohol oxidation into acrolein on the rhombic phase of molybdenum oxide modified with vanadium oxide has been studied by the kinetic molhod ami Ijy ESR of ions in situ. II was shown, that active sites for this reaction are V ions situated in the bulk of the catalyst, or near its surface, but not at the surface. Fast diffusion of e.lectrons and a more slower diffusion of oxygen ions between the surface and the bulk occur during the reaction. 

ESR microscopy (at X-band) has been applied to a variety of materials including in situ studies of the oxidation of coals defects in diamonds radio-metric dosimeters polymer swelling and to the diffusion of oxygen in model biological systems. The resolution of ESR imaging depends on the field gradient and line width, and the best resolution to date from an X-band imager is 1 pm. 

---