Abstract
Bound water layers in hydrated powders and aqueous suspensions of microcrystalline cellulose were investigated by 1H NMR methods. The characteristics of such layers were calculated and the magnitude of the interfacial energy (γs) at the cellulose/water interface in an aqueous environment determined. It was found that the concentration of strongly bound water and the value of γs were strongly dependent on the concentration of cellulose in suspension. This is probably due to the strong interaction between cellulose particles. At very high suspension concentrations, the concentration of water inside the cellulose filament decreased by more than three-times while the value of γs decreased from 31 J/g to 9 J/g as a result of surface forces.
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