Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 457, Issue -, Pages 487-494Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2014.06.018
Keywords
Core-shell capsule; Aqueous-core; Silica-shell; Mannitol; Phase change
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Funding
- National Natural Science Foundation of China [51373151, 51173159]
- Fundamental Research Funds for the Central Universities of China [2014QNA4037]
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Mannitol@Silica core-shell capsules were prepared from W/O emulsion by adding silicon precursor into the oil-continuous phase to form silica shell through interfacial polymerization reaction. The bicomponent mixture of tetraethoxysilane (TEOS) and 3-aminopropyl triethoxysilane (APTS) was used as silicon precursor to form relatively thick silica shell. The reaction was triggered by the penetration of APT'S from oil-continuous phase into the aqueous phase and the silica shell formed as both TEOS and APTS hydrolyzed and polymerized after diffusing through the W/O interface. The growth of the shell layer was believed to be an outside-in mode. The mannitol crystal was well sealed inside the silica capsule under an optimized condition and the leakage was successfully avoided. The Mannitol@Silica core-shell capsules own irreversible phase change character in the range of 142.1-166.2 degrees C with latent heat of 147.4J/g. (C) 2014 Elsevier B.V. All rights reserved.
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