H2O2-microwave treated graphite stabilized stearic acid as a composite phase change material for thermal energy storage

Chuanchang Li; Baoshan Xie; Jian Chen; Zhongsheng Chen; Xiaoqin Sun; Stuart W. Gibb

doi:10.1039/c7ra11016b

H2O2-microwave treated graphite stabilized stearic acid as a composite phase change material for thermal energy storage

Chuanchang Li, Baoshan Xie, Jian Chen, Zhongsheng Chen, Xiaoqin Sun, Stuart W. Gibb

Environmental Research Institute

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Abstract

Flake graphite (FG) was treated by microwave radiation in hydrogen peroxide solution and used to support stearic acid (SA) to synthesize SA/FG composites for thermal energy storage. The thermostability of the SA/FG was measured via TG-DSC, revealing they have good thermal stability up to 230 C. The thermal
properties of the composites were changed by varying the radiation time, and the SA/FG3 composite with the longest FG treatment time showed a higher latent heat value (61.05 J g1 for melting and 61.00 J g1 for freezing), and greater crystallinity (Fc, 98.34%) than other samples according to the
analysis of DSC. The SA/FG3 composite had a good thermal reliability after thermal cycling tests. The thermal conductivity of SA/FG3 (3.18 W m1 k1) was 12.2 times higher than that of pure SA. Furthermore, the mechanism of the enhanced performance of SA/FG3 was further revealed by monitoring functional groups of the surface of FG and demonstrated on the atomic-scale. Infrared
imaging showed SA/FG3 possessed superior thermal-regulated properties. Therefore, all these thermal properties indicate SA/FG3 has potential for application in thermal energy storage systems.

Original language	English
Pages (from-to)	52486-52495
Number of pages	10
Journal	RSC Adv.
Volume	7
Issue number	83
DOIs	https://doi.org/10.1039/c7ra11016b
Publication status	Published - 13 Nov 2017

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c7ra11016b
Open Access. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.
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title = "H2O2-microwave treated graphite stabilized stearic acid as a composite phase change material for thermal energy storage",

abstract = "Flake graphite (FG) was treated by microwave radiation in hydrogen peroxide solution and used to support stearic acid (SA) to synthesize SA/FG composites for thermal energy storage. The thermostability of the SA/FG was measured via TG-DSC, revealing they have good thermal stability up to 230 C. The thermalproperties of the composites were changed by varying the radiation time, and the SA/FG3 composite with the longest FG treatment time showed a higher latent heat value (61.05 J g1 for melting and 61.00 J g1 for freezing), and greater crystallinity (Fc, 98.34%) than other samples according to theanalysis of DSC. The SA/FG3 composite had a good thermal reliability after thermal cycling tests. The thermal conductivity of SA/FG3 (3.18 W m1 k1) was 12.2 times higher than that of pure SA. Furthermore, the mechanism of the enhanced performance of SA/FG3 was further revealed by monitoring functional groups of the surface of FG and demonstrated on the atomic-scale. Infraredimaging showed SA/FG3 possessed superior thermal-regulated properties. Therefore, all these thermal properties indicate SA/FG3 has potential for application in thermal energy storage systems.",

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note = "This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes. ",

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AU - Li, Chuanchang

AU - Xie, Baoshan

AU - Chen, Jian

AU - Chen, Zhongsheng

AU - Sun, Xiaoqin

AU - Gibb, Stuart W.

N1 - This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

PY - 2017/11/13

Y1 - 2017/11/13

N2 - Flake graphite (FG) was treated by microwave radiation in hydrogen peroxide solution and used to support stearic acid (SA) to synthesize SA/FG composites for thermal energy storage. The thermostability of the SA/FG was measured via TG-DSC, revealing they have good thermal stability up to 230 C. The thermalproperties of the composites were changed by varying the radiation time, and the SA/FG3 composite with the longest FG treatment time showed a higher latent heat value (61.05 J g1 for melting and 61.00 J g1 for freezing), and greater crystallinity (Fc, 98.34%) than other samples according to theanalysis of DSC. The SA/FG3 composite had a good thermal reliability after thermal cycling tests. The thermal conductivity of SA/FG3 (3.18 W m1 k1) was 12.2 times higher than that of pure SA. Furthermore, the mechanism of the enhanced performance of SA/FG3 was further revealed by monitoring functional groups of the surface of FG and demonstrated on the atomic-scale. Infraredimaging showed SA/FG3 possessed superior thermal-regulated properties. Therefore, all these thermal properties indicate SA/FG3 has potential for application in thermal energy storage systems.

AB - Flake graphite (FG) was treated by microwave radiation in hydrogen peroxide solution and used to support stearic acid (SA) to synthesize SA/FG composites for thermal energy storage. The thermostability of the SA/FG was measured via TG-DSC, revealing they have good thermal stability up to 230 C. The thermalproperties of the composites were changed by varying the radiation time, and the SA/FG3 composite with the longest FG treatment time showed a higher latent heat value (61.05 J g1 for melting and 61.00 J g1 for freezing), and greater crystallinity (Fc, 98.34%) than other samples according to theanalysis of DSC. The SA/FG3 composite had a good thermal reliability after thermal cycling tests. The thermal conductivity of SA/FG3 (3.18 W m1 k1) was 12.2 times higher than that of pure SA. Furthermore, the mechanism of the enhanced performance of SA/FG3 was further revealed by monitoring functional groups of the surface of FG and demonstrated on the atomic-scale. Infraredimaging showed SA/FG3 possessed superior thermal-regulated properties. Therefore, all these thermal properties indicate SA/FG3 has potential for application in thermal energy storage systems.

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EP - 52495

JO - RSC Adv.

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H2O2-microwave treated graphite stabilized stearic acid as a composite phase change material for thermal energy storage

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