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Materials 2018, 11(11), 2191; https://doi.org/10.3390/ma11112191

Preparation and Characterization of Expanded Clay-Paraffin Wax-Geo-Polymer Composite Material

1
College of Engineering, United Arab Emirates University, P.O. Box 15551, Al Ain 15551, UAE
2
School of Engineering, Wellington Institute of Technology, Lower Hutt 5045, New Zealand
*
Author to whom correspondence should be addressed.
Received: 21 September 2018 / Revised: 18 October 2018 / Accepted: 22 October 2018 / Published: 6 November 2018
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Abstract

Paraffin-based phase change material (PCM) is impregnated into the pores of lightweight expanded clay aggregate (LECA) through vacuum impregnation to develop PCM containing macro-capsules of LECA. Three different grades of LECA varying in size and morphology are investigated to host the PCM to determine the impregnation effectiveness, viability for coating, and its stability. The produced LECA-PCM is coated with geopolymer paste (GP) to provide leak proofing during the phase change. The PCM is thermophysically characterized by employing differential scanning calorimetry (DSC) and the temperature history method (THM) to determine the phase transition and the latent heat. The stability of the macro-capsules is determined by weight loss through rapid thermal cycling (RTC) at elevated temperatures. Leakage of the PCM is tested using the diffusion-oozing circle test (DOCT). The results show that the GP coated LECA-PCM macro-capsules achieved 87 wt % impregnation efficiencies and no noticeable loss of PCM, which indicates leak proofing of the developed capsules up to 1000 RTC. View Full-Text
Keywords: geo-polymer coating; phase change material; expanded clay; macro-encapsulation; vacuum impregnation geo-polymer coating; phase change material; expanded clay; macro-encapsulation; vacuum impregnation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hassan, A.; Ismail, N.; Mourad, A.-H.I.; Rashid, Y.; Laghari, M.S. Preparation and Characterization of Expanded Clay-Paraffin Wax-Geo-Polymer Composite Material. Materials 2018, 11, 2191.

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