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

Ryusei Ito, Boris Golman, Kunio Shinohara

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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 languageEnglish
Pages (from-to)40-45
Number of pages6
JournalJournal of Chemical Engineering of Japan
Issue number1
Publication statusPublished - Jan 1 2002


  • Agglomerate
  • Coating
  • Controlled release
  • Mathematical model
  • Urea fertilizer

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'Controlled release of core particle coated with soluble particles in impermeable layer'. Together they form a unique fingerprint.

Cite this