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Periodic characteristics of composite membrane permeability
Journal of Microencapsulation
|January 1, 1989
Summary
This study models electrolyte transport through composite microcapsule membranes, revealing oscillatory permeation mechanisms. The findings quantify mass and ionic diffusion in ethylcellulose/polystyrene microcapsules for improved drug delivery applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Physical Chemistry
Background:
- Microcapsule membrane permeability is crucial for evaluating microcapsule function.
- Composite membranes with heterogeneous structures can exhibit complex transport phenomena.
- Understanding oscillatory permeation is key for controlled release applications.
Purpose of the Study:
- To derive a theoretical solution for transport phenomena in composite membranes with a two-element parallel array.
- To apply this solution to experimental data of phenobarbital transport through ethylcellulose/polystyrene microcapsules.
- To elucidate the mechanism of oscillatory permeation in such systems.
Main Methods:
- Derivation of a transport equation solution for parallel-array composite membranes.
- Application of the derived solution to experimental data from literature.
- Analysis of oscillatory permeation behavior based on the model.
Main Results:
- A solution for transport phenomena in patchwork-like composite membranes was successfully derived.
- The model was applied to experimental data for phenobarbital transport.
- Dispersivities for mass (4.0 x 10^-4 cm²/sec) and ionic diffusion (6.0 x 10^-13 cm²/sec) were determined for a membrane thickness of 3.5 x 10^-4 cm.
Conclusions:
- The derived solution effectively describes oscillatory permeation in composite microcapsule membranes.
- The study provides quantitative insights into mass and ionic diffusion mechanisms.
- This work contributes to the understanding and design of microcapsules for controlled substance release.