Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/62368
Title: PCM-in-water emulsion for solar thermal applications : the effects of emulsifiers and emulsification conditions on thermal performance, stability and rheology characteristics
Authors: Zhang, X
Wu, JY 
Niu, J 
Keywords: PCM
Emulsion
Stability
Viscosity
Supercooling
Nucleating agent
Issue Date: 2016
Publisher: North-Holland
Source: Solar energy materials and solar cells, 2016, v. 147, p. 211-224 How to cite?
Journal: Solar energy materials and solar cells 
Abstract: The aim of this study was to develop a stable water emulsion-based phase change material (PCM), with low viscosity, for solar thermal applications. The effects of different non-ionic emulsifiers, including nine kinds of binary mixtures of Tweens and Spans, on the droplet diameter distribution, the apparent viscosity and the stability of the emulsions, were evaluated. There appeared to be an effective range for both the emulsifier concentration and the dispersed phase PCM content to maintain the stability and the fluidity of the emulsions. The emulsification process also played an important role in controlling the size distribution of the PCM droplets in the emulsions. Thermal analysis by differential scanning calorimetry indicated that the degree of supercooling of the emulsion increased with the droplet size decline and that dispersed nano SiO2 particles were effective as a nucleating agent to reduce supercooling. Multiple phase transitions were observed in the melting and the crystallisation processes of the PCM. The rheology characteristics and the long-term storage stability of the emulsions were also investigated and are discussed.
URI: http://hdl.handle.net/10397/62368
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2015.12.022
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