Abstract
Nuclear magnetic relaxation dispersion measurements are reported on aqueous suspensions of bentonite clays which demonstrate that the water-proton spin-lattice relaxation rates are dominated by magnetic interactions with paramagnetic centers entrapped in the mineral matrix. The water-proton spin-lattice relaxation rates are linear in the concentration of the clay mineral. The relaxivity may be increased by the addition of paramagnetic metal ions to the suspension and the shape of the relaxation dispersion profile demonstrates that the mineral behaves as a sequestering agent in that there is no free metal detectable. The temperature dependence of the relaxation rate is consistent with the electron-nuclear coupling being modulated by translational motions of the water molecules; however, the shape of the relaxation dispersion profile does not fit the usual models for nuclear-spin relaxation caused by translational diffusion in a solution containing a paramagnetic cosolute.
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