Abstract
ESR-tomography based on electron spin echo was used to study the translational diffusion of stable radical 2,2,6,6-tetramethyl-4-pipyridinoxyl in the solutions filling the pore space of silica gel. The values of the efficient diffusion coefficients were measured for the solution of radicals 2,2,6,6-tetramethyl-4-pipyridinoxyl in methanol and 2-methyl-tetrahydrofuran, depending on the mean size of the silica gel pore. It was shown that the value of the diffusion coefficient decreased as pore size decreased, and furthermore depended on the solvent type. A linear relation between the diffusion coefficient and the spin exchange constant was established within the scope of the quasihomogeneous diffusion model.
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Sukhoroslov, A.A., Samoilova, R.I. & Milov, A.D. Application of electron spin echo ESR-tomography to study radical diffusion in porous media. Appl Magn Reson 2, 577–586 (1991). https://doi.org/10.1007/BF03166065
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DOI: https://doi.org/10.1007/BF03166065