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|Title:||Ultrathin graphite sheets stabilized stearic acid as a composite phase change material for thermal energy storage||Authors:||Li, Chuanchang
Gibb, Stuart W.
|Keywords:||Engineering::Materials||Issue Date:||2019||Source:||Li, C., Xie, B., Chen, D., Chen, J., Li, W., Chen, Z., Gibb, S. W. & Long, Y. (2019). Ultrathin graphite sheets stabilized stearic acid as a composite phase change material for thermal energy storage. Energy, 166, 246-255. https://dx.doi.org/10.1016/j.energy.2018.10.082||Journal:||Energy||Abstract:||Ultrathin graphite sheets (UGSs) were stripped directly from natural flake graphite (FG) through a coupled ultrasonication-milling (CUM) process followed by a shear-assisted supercritical CO2 (SSC) stripping. As-prepared UGSs were centrifuged (3500 and 5000 rpm) to support stearic acid (SA) to produce SA/UGSs. Characterization results proved UGSs was stripped from natural FG. Structural and morphological characterization demonstrated that the UGS-5000 had a layer thickness was about 3.4–4.2 nm, significantly thinner than that of natural FG. Raman spectra and TG-DSC analysis showed UGS-5000 have more structural defects than other UGSs, and could accommodate a SA loading capability of 171.5%. FTIR and XRD analysis indicated that no chemical reaction had occurred between SA and UGSs during impregnation. All samples had a good thermal stability below 180 °C, with the endothermic phase change peak being recorded between 53.60 and 53.12 °C range, and the melting and freezing enthalpies of SA/UGS-5000 were 113.7 and 112.9 J g−1, respectively. After 50 thermal cycles, it could keep a great thermal reliability and has a thermal conductivity of 10.08 times higher than that of pure SA. These results demonstrate that SA/UGS-5000 have potential in thermal energy storage applications including cooling, building energy efficiency and solar thermal storage.||URI:||https://hdl.handle.net/10356/147012||ISSN:||0360-5442||DOI:||10.1016/j.energy.2018.10.082||Rights:||© 2018 Elsevier Ltd. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||MSE Journal Articles|
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