Controlled release of structural bed of coated particles filled with wax dispersing starch

Hiromu Nunoko, Ryusei Ito, Boris Golman, Kunio Shinohara

Research output: Contribution to journalArticlepeer-review


Encapsulated particles for controlled release generally show a diffusion-type release pattern. However, a release curve of sigmoid type could be useful for various applications. Therefore, a structural bed was prepared by filling voids among encapsulated particles with fine particles dispersed in the filler in order to obtain sigmoid-type release curves. Then, the effects of the volume fraction of fine particles, the packing structure of encapsulated particles and the structural bed height on the release rate were studied. As a result, it was possible to obtain sigmoid-type release curves with the structural bed. The initial release rate decreased with decreasing volume fraction of fine particles and increasing voidage among encapsulated particles, but it was independent of the bed height.

Original languageEnglish
Pages (from-to)102-104
Number of pages3
JournalKagaku Kogaku Ronbunshu
Issue number1
Publication statusPublished - Jan 1 2004


  • Controlled Release
  • Release Paths
  • Sigmoid-type
  • Structural Bed

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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