Abstract
In the technological treatment of wood materials, it is important to control water-wood interactions. To measure the water self-diffusion coefficients properly in wetting/drying processes of wood, it is necessary to understand many factors affecting the experiments. For fibrous material, the diffusivities of water could be different along the fiber and in the direction of perpendicular to fiber axis. The chapter presents the data of NMR relaxation and 1-dimensional PFG NMR in studying anisotropic diffusion of water in wood.
Keywords: Apparent diffusion coefficient Dapp, Cross-relaxation (CR), Diffusion anisotropy, Free induction decay (FID), Goldman-Shen (GS) experiment, Inverse Laplace transform (ILT), Inversion recovery (IR) method, NMR, Pulsed field gradient (PFG) NMR, Spin-lattice (longitudinal) relaxation time T1, Spin-spin (transverse) relaxation time T2, Stimulated echo (STE), Water, Wood.