Release behavior of W/O/W-type microcapsule

Masumi Uehara, Yuuka Yoshinaga, Tomohiro Ogawa, Yasuyuki Maki, Hiroyuki Takeno, Takao Yamamoto, Kimio Ichikawa, Toshiaki Dobashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have prepared W/O/W-type microcapsules with polyureaurethane wall membrane and aqueous core containing methylene blue by means of the double emulsification method and the effect of the rate of agitation at the twice emulsification on the release of methylene blue to dispersing methanol was examined. The release curve was expressed fairly well by the streched exponential form: (Equation presented) where C(t) and C eq are the concentrations of methylene blue in the dispersing methanol at time t and at the equilibrium state, respectively. The time constant τ increased and the exponent α decreased with increasing the rate of agitation at the second emulsification, whereas τ decreased and α was constant with increasing the rate of agitation at the first emulsification. These differences are discussed from a viewpoint of inhomogeneity of the microcapsule wall membrane.

Original languageEnglish
Title of host publicationSilicon Science and Advanced Micro-Device Engineering II
Pages55-60
Number of pages6
DOIs
Publication statusPublished - Jan 18 2012
Externally publishedYes
Event6th International Symposium on Silicon Science and 2nd International Conference on Advanced Micro-Device Engineering, ISSS and AMDE 2010 - Kiryu, Japan
Duration: Dec 9 2010Dec 10 2010

Publication series

NameKey Engineering Materials
Volume497
ISSN (Print)1013-9826

Other

Other6th International Symposium on Silicon Science and 2nd International Conference on Advanced Micro-Device Engineering, ISSS and AMDE 2010
CountryJapan
CityKiryu
Period12/9/1012/10/10

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Uehara, M., Yoshinaga, Y., Ogawa, T., Maki, Y., Takeno, H., Yamamoto, T., ... Dobashi, T. (2012). Release behavior of W/O/W-type microcapsule. In Silicon Science and Advanced Micro-Device Engineering II (pp. 55-60). (Key Engineering Materials; Vol. 497). https://doi.org/10.4028/www.scientific.net/KEM.497.55