Sodium NMR relaxation in porous materials.
The NMR relaxation of hydrogen nuclei of a fluid in a porous material is generally interpreted in terms of the Brownstein-Tarr model, in which the relaxation rate of the signal is inversely proportional to the pore size. We have investigated whether this model can be applied to the relaxation of Na nuclei in a NaCl solution in a porous material. The results indicate that the ion distribution over the pores can be obtained from an analysis of the Na NMR signal decay, if the pore sizes are roughly below 1 microm. This information is very useful for studies of combined moisture and ion transport in porous building materials.
Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
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D003198:Computer Simulation; D004058:Diffusion; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008567:Membranes, Artificial; D008956:Models, Chemical; D010539:Permeability; D016062:Porosity; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry*
D008567:Membranes, Artificial; D012996:Solutions; D012965:Sodium Chloride; D058428:Silica Gel; D012822:Silicon Dioxide