Preparation of silica microspheres encapsulating phase-change material by sol-gel method in O/W emulsion

L. Y. Wang, P. S. Tsai, Yu Min Yang

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Spherical silica microcapsules containing phase-change material (PCM) were prepared by the sol-gel method in O/W emulsion. This is the first time that inorganic encapsulation of PCM with core/shell structure has been studied. The results of this synthesis revealed that micron size (4 ∼ 8 μm) silica microspheres encapsulating n-pentadecane can be successfully created from acidic solutions ([H+] ≥ 1.44 N) by using cationic surfactants as the emulsifiers. The identification of the mechanisms for the formation of silica shell at the oil-water interface indicates that it should be the charge-controlled mechanism through S+X-I+ (positively charged surfactant-halide ion-positively charged silica species) electrostatic interactions or the reaction rates-controlled mechanism working on cationic emulsifiers.

Original languageEnglish
Pages (from-to)3-14
Number of pages12
JournalJournal of Microencapsulation
Volume23
Issue number1
DOIs
Publication statusPublished - 2006 Feb 1

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Pharmaceutical Science
  • Chemical Engineering(all)
  • Pharmacology

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