NUCLEAR-RELAXATION OF LIQUIDS IN POROUS-MEDIA

A theoretical treatment is proposed to explain the variations of the n uclear relaxation rates T1(-1), T2(-1) and T1rho-1 with the temperatur e, frequency and average pore size of wetting and non-wetting liquids confined in porous silica glasses. We propose an expression of these r ates as a linear combination of surface and geometrical confinement ef fects. The pore size dependences allow a separation of these two effec ts. The geometrical confinement dominates over the surface interaction at low frequency and for small pores.