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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Preparation and characterization of silica microcapsules containing butyl-stearate via sol-gel method
MIAO Chun-yan(缪春燕)1, 2, YAO You-wei(姚有为)1, TANG Guo-yi(唐国翌)1,WENG Duan(翁  端)2

1. Graduated School at Shenzhen, Tsinghua University, Shenzhen 518055, China;
2. Department of Materials Science and Engineering, Tsinghua University, Beijing 100086, China

Abstract:For thermal energy storage application in energy-saving building materials, silica microcapsules containing phase change material were prepared using sol-gel method in O/W emulsion system. In the system droplets in microns are formed by emulsifying an organic phase consisting of butyl-stearate as core material. The silica shell was formed via hydrolysis and condensation from tetraethyl silicate with acetate as catalyst. The SEM photographs show the particles possess spherical morphology and core-shell structure. The as-prepared silica microcapsules mainly consist of microsphere in the diameter of 3−7 μm and the median diameter of these microcapsules equals to 5.2 μm. The differential scanning calorimetry (DSC) curves indicate that the latent heat and the melting point of microcapsules are 86 J/g and 22.6 ℃, respectively. The results of DSC and TG further testify the microcapsules with core-shell structure.

 

Key words: silica microcapsules; sol-gel; butyl-stearate; phase change materials

ISSN 1672-7029
CN 43-1423/U

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