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| - Ionic Transport, Reaction Kinetics, and Gel Formation. A Low-Field Overhauser MagneticResonance Imaging Study
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| - The electronic Overhauser effect was employed to enhance nuclear magnetic resonance images obtained ina magnetic field of only 16 mT. Despite the weak magnetic field, the technique can reveal, in some systems,various aspects of ionic transport and kinetics apparently not observed in conventional high-field magneticresonance imaging. We employed Overhauser imaging to monitor the spatial and temporal evolution of thegelation of sodium alginate by calcium ions. The sensitivity of the Overhauser enhancement to small changesin gel composition permits a stringent test of the underlying mechanisms of transport and chemical kinetics.
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