Abstract
1H nuclear magnetic resonance relaxation time measurements are reported for water equilibrated on milled Northern white-cedar wood. At water contents below 0.38 g of water per gram of dry wood, no freezing event is detected in the NMR experiment. At water contents greater than this transverse relaxation is nonexponential, but may be understood using a simple model. Longitudinal relaxation is nonexponential throughout the water content range studied; however, the data may not be analyzed using the concept of preferential filling of successive layers of water. The magnitudes of the relaxation times measured require that the motion of the average water molecule adsorbed to the wood surface be very rapid with correlation times for reorientation of the interproton vector on the order of nanoseconds at 240°K.
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