Abstract
The ESR of S=1/2 paramagnetic species is one of the most convenient methods for probing microheterogeneous structures in gels, lyotropic liquid crystals or membranes. The interpretation of ESR spectra in term of dynamics of the spin probes generally requires computer simulations whose principles are briefly described. Some examples are given of simulations applied to the determination of the flexibility of the tridimensional network in polymer gels crosslinked by Cu2+ and VO2+ as well as to the dynamics of nitroxide spin probes in gels and in phospholipid model membranes.
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