Table 1. Diffusion Exponent and the Solute Release Mechanism for Spherical-Shaped Matrices.

diffusion exponent (n)	overall solute diffusion mechanism
n < 0.43	Fickian diffusion
0.43 < n < 0.8	anomalous (non-Fickian) diffusion
0.85 < n < 1	case transport II
n > 1	super case transport II