Controlled release of core particle coated with soluble particles in impermeable layer

Ryusei Ito; Boris Golman; Kunio Shinohara

doi:10.1252/jcej.35.40

Controlled release of core particle coated with soluble particles in impermeable layer

Ryusei Ito, Boris Golman, Kunio Shinohara

Department of Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The dry based coating of core particles with soluble powder dispersed inside an impermeable layer of biodegradable wax was performed to control the release rate of core material. The mathematical model was developed to describe the release profiles by diffusion of core material through the percolation paths formed with soluble powder inside the coating layer. Then, the effective diffusivity was estimated by a random walk model. The experimental release profiles for the urea core particles coated with urea powder dispersed inside a lauric acid layer were quantitatively compared with simulated ones for different volume fractions of soluble powder and thickness of the coating layer. As a result, the low release rate of core material was proven to be obtained with low volume fraction of soluble powder dispersed in the thick coating layer.

Original language	English
Pages (from-to)	40-45
Number of pages	6
Journal	Journal of Chemical Engineering of Japan
Volume	35
Issue number	1
DOIs	https://doi.org/10.1252/jcej.35.40
Publication status	Published - Jan 1 2002

Keywords

Agglomerate
Coating
Controlled release
Mathematical model
Urea fertilizer

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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abstract = "The dry based coating of core particles with soluble powder dispersed inside an impermeable layer of biodegradable wax was performed to control the release rate of core material. The mathematical model was developed to describe the release profiles by diffusion of core material through the percolation paths formed with soluble powder inside the coating layer. Then, the effective diffusivity was estimated by a random walk model. The experimental release profiles for the urea core particles coated with urea powder dispersed inside a lauric acid layer were quantitatively compared with simulated ones for different volume fractions of soluble powder and thickness of the coating layer. As a result, the low release rate of core material was proven to be obtained with low volume fraction of soluble powder dispersed in the thick coating layer.",

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