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Values of diffusional exponent, n, and related drug release mechanism from various controlled released devices [84]
| Diffusional exponent, n | Drug release mechanism | ||
|---|---|---|---|
| Thin film | Cylindrical sample | Spherical sample | |
| 0.5 | 0.45 | 0.43 | Fickian diffusion |
| 0.5<n<1.0 | 0.45<n<1.0 | 0.43<n<1.0 | Anomalous transport |
| 1.0 | 1.0 | 1.0 | Case II transport (Zero-order release) |
