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Surface effects toward the mobility of charged spin probes: ESR study of nitroxide solutions adsorbed on zeolites

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
115
Issue
1
Identifiers
DOI: 10.1016/0021-9797(87)90011-7

Abstract

Abstract A study concerning the surface effects of zeolites X and Y toward the mobility of charged nitroxides is reported. Because of their critical dimensions, the nitroxides were only able to enter the large faujasite cavities. The relaxation analysis allowed us to establish the existence of a decreased mobility of the water solutions of nitroxide adsorbed in the zeolitic cavities with respect to mobility in bulk water. The negative radical Tempyo − gave results on the status of water near the cavity center whereas the ESR spectra of the positive radical TempTMA + were largely affected by water layers near the cavity walls.

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