Andrea Gabrielli - ISC-CNR Roma #
Spatio-temporal ordinary and anomalous diffusion in heterogeneous
 and organic media by NMR #
In this talk we give an overview of the self-diffusion
 properties of water molecules in eterogeneous materials and of its
 study by novel NMR methods. We study both the cases of human brain
 tissues in vivo and of artificial complex porous media
 obtained by mono and polydisperse sphere packing of micro-beads
 dispersed in water. In particular for the second case, the diffusion phase
 diagram in highly confined colloidal systems, predicted by Continuous Time
 Random Walk (CTRW), is experimentally obtained. Temporal and spatial fractional
 exponents introduced within the framework of CTRW,
 are simultaneously measured by Pulse Field Gradient Nuclear Magnetic
 Resonance technique in samples of micro-beads dispersed in water.