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Open AccessArticle

Fabrication and Thermal Properties of Capric Acid/Calcinated Iron Tailings/Carbon Nanotubes Composite as Form-Stable Phase Change Materials for Thermal Energy Storage

by Peng Liu 1,2,3,†, Xiaobin Gu 4,†, Zhikai Zhang 5, Jianping Shi 1,*, Jun Rao 2 and Liang Bian 2
1
School of Electronic & Communication Engineering, Guiyang University, Guiyang 550005, China
2
School of Gemology and Materials Technology, Hebei GEO University, Shijiazhuang 050031, China
3
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang 621010, China
4
Materials Interfaces Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518005, China
5
School of Water Resources and Environment, Hebei GEO University, Shijiazhuang 050031, China
*
Author to whom correspondence should be addressed.
These co-first authors contributed equally to this work.
Minerals 2019, 9(11), 648; https://doi.org/10.3390/min9110648
Received: 16 September 2019 / Revised: 13 October 2019 / Accepted: 15 October 2019 / Published: 23 October 2019
(This article belongs to the Section Crystallography and Physical Chemistry of Minerals)
In this study, a novel form-stable phase change material (FSPCM) consisting of calcination iron tailings (CIT), capric acid (CA), and carbon nanotubes (CNT) was prepared using a simple direct melt impregnation method, and a series of tests have been carried out to investigate its properties. The leakage tests showed that CA can be retained in CIT with a mass fraction of about 20 wt.% without liquid leakage during the phase change process. Moreover, the morphology, chemical structure, and thermal properties of the fabricated composite samples were investigated. Scanning electron microscope (SEM) micrographs confirmed that CIT had a certain porous structure to confine CA in composites. According to the Fourier transformation infrared spectroscope (FTIR) results, the CA/CIT/CNT FSPCM had good chemical compatibility. The melting temperature and latent heat of CA/CIT/CNT by differential scanning calorimeter (DSC) were determined as 29.70 °C and 22.69 J/g, respectively, in which the mass fraction of CIT and CNT was about 80 wt.% and 5 wt.%, respectively. The thermal gravity analysis (TGA) revealed that the CA/CIT/CNT FSPCM showed excellent thermal stability above its working temperature. Furthermore, the melting and freezing time of CA/CIT/CNT FSPCM doped with 5 wt.% CNT reduced by 42.86% and 54.55% than those of pure CA, and it showed better heat transfer efficiency. Therefore, based on the above analyses, the prepared CA/CIT/CNT FSPCM is not only a promising candidate material for the application of thermal energy storage in buildings, but it also provides a new approach for recycling utilization of iron tailings. View Full-Text
Keywords: capric acid; calcinated iron tailings; carbon nanotubes; FSPCM; thermal energy storage capric acid; calcinated iron tailings; carbon nanotubes; FSPCM; thermal energy storage
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MDPI and ACS Style

Liu, P.; Gu, X.; Zhang, Z.; Shi, J.; Rao, J.; Bian, L. Fabrication and Thermal Properties of Capric Acid/Calcinated Iron Tailings/Carbon Nanotubes Composite as Form-Stable Phase Change Materials for Thermal Energy Storage. Minerals 2019, 9, 648.

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