Abstract
The properties of water or other polar liquids either dispersed in porous solids or sorbed in polymeric materials are quite different from those of bulk water. In this paper we report on the use of continuous wave electron spin resonance and pulsed wave electron spin echo spectroscopy (cw-ESR and ESE, respectively) for the study of these anomalous features. The cw-ESR and ESE results obtained with neutral, positive and negative nitroxide radicals in liquid solutions adsorbed on porous solids such as silica gels and zeolites are discussed. A comparison with the results obtained from the same probes introduced in a perfluorinated polymer is also made. The information on the dynamical and structural properties of both probe and adsorbed liquid given by the two techniques are analyzed in terms of both relaxation mechanism and dependence on the properties of the boundary layers at the solid—liquid interface in ew-ESR, and of both nuclear modulation and evaluated phase memory times in ESE.
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