Abstract—The kinetics of release of active material was investigated for the polydisperse core particles coated with layers of fine soluble particles dispersed in the impermeable biodegradable wax. A detailed mathematical model was developed to simulate the release kinetics governed by diffusion through the void space of the coating layer formed after the dissolution of soluble particles. The effects of the scale and shape parameters of the Rosin-Rammler type of the core size distribution were studied numerically on release profile. As a result, the low release rate was obtained for the core size distribution of large scale parameter mainly due to the small specific surface area of particles as well as for the coating layer of low volume fraction of soluble particles owing to the significant diffusional resistance.
Index Terms—Release kinetics, Coated particle, Polydispersecore, Release model.
B. Golman is with the School of Chemical Engineering, SuranareeUniversity of Technology, Nakhon Ratchasima 30000 Thailand (e-mail:golman@sut.ac.th).
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Cite: Boris Golman, "Kinetics of Release from Polydisperse Core Particles Coated with Layers of Fine Soluble Particles," International Journal of Chemical Engineering and Applications vol. 2, no. 4, pp. 283-287, 2011.
