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Surfactant selection in phase change dispersions.
Number: 1914
Author(s) : O'NEILL P., FISCHER L., STAMATIOU A., REVELLIN R., BONJOUR J.
Summary
In this work, the thermophysical behaviour of dispersions formulated with different surfactant systems is presented. Firstly, a surfactant was chosen on accounts of its bulky substituent groups and the thermophysical properties were compared to the results from a standard surfactant system. Thermal analysis showed the supercooling degree to be 13 K with the standard surfactant system, and 4 K with the bulky surfactant, suggesting the surfactant had nucleating-inducing behaviour. However, the bulky surfactant resulted in a viscous phase change dispersion, which separated after thermal cycling. Consequently, smaller co-surfactants were added to allow higher packing densities to increase stability, and decrease the viscosity, whilst keeping the nucleating ability of the original surfactant. This optimised surfactant system showed a supercooling reduction of 9 K and thermal stability during extended cycling. Overall, the results demonstrate an innovative approach in fine-tuning the thermophysical properties of a phase change dispersion with the use of cosurfactants.
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Details
- Original title: Surfactant selection in phase change dispersions.
- Record ID : 30028834
- Languages: English
- Subject: Technology
- Source: 13rd IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: (online) Vicenza, Italy, September 1-3, 2021.
- Publication date: 2021/09/01
- DOI: http://dx.doi.org/10.18462/iir.PCM.2021.1914
- Document available for consultation in the library of the IIR headquarters only.
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