Table 4.

Diffusion coefficients D for the first 2 h of release deduced from fitting the experimental results with equations (3.2) and (3.1).

formulation	sphere diameter (μm)	D/(m2 s−1) (sphere)	cylinder diameter (μm)	D/(m2 s−1) (cylinder)
F1	3.2	4.0 × 10−18	1.25	4.7 × 10−18
F2	3.0	2.1 × 10−18	1.25	2.8 × 10−18
F3	4.2	1.6 × 10−17	1.85	2.4 × 10−17
F4	3.8	1.2 × 10−18	1.70	1.8 × 10−18
F5	1.7	1.5 × 10−18	0.55	1.2 × 10−18