Highly Stable Phase Change Material Emulsions Fabricated by Interfacial Assembly of Amphiphilic Block Copolymers during Phase Inversion

Title
Highly Stable Phase Change Material Emulsions Fabricated by Interfacial Assembly of Amphiphilic Block Copolymers during Phase Inversion
Authors
김진웅
Keywords
NANO-EMULSIONS; TEMPERATURE METHOD; HEAT-TRANSFER; STABILITY; SLURRY; OIL
Issue Date
2015-03
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v. 31, NO 9, Page. 2649-2654
Abstract
This study introduced a robust and promising approach to fabricate highly stable phase change material (PCM) emulsions consisting of n-tetradecane as a dispersed phase and a mixture of meso-2,3-butanediol (m-BDO) and water as a continuous phase. We showed that amphiphilic poly(ethylene oxide)-b-poly(epsilon-caprolactone) block copolymers assembled to form a flexible but tough polymer membrane at the interface during phase inversion from water-in-oil emulsion to oil-in-water emulsion, thus remarkably improving the emulsion stability. Although the incorporation of m-BDO into the emulsion lowered the phase changing enthalpy, it provided a useful means to elevate the melting temperature of the emulsions near to 15 degrees C. Interestingly, supercooling was commonly observed in our PCM emulsions. We attributed this to the fact that the PCM molecules confined in submicron-scale droplets could not effectively nucleate to grow molecular crystals. Moreover, the presence of m-BDO in the continuous phase rather dominated the heat emission of the emulsion system during freezing, which made the supercooling more favorable.
URI
http://pubs.acs.org/doi/abs/10.1021/la504424uhttp://hdl.handle.net/20.500.11754/22855
ISSN
0743-7463; 1520-5827
DOI
http://dx.doi.org/10.1021/la504424u
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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