Modified sepiolite stabilized stearic acid as a form-stable phase change material for thermal energy storage

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Minerals, Metallurgy, and Materials Pub Date : 2023-08-25 DOI:10.1007/s12613-023-2627-4

Chuanchang Li, Xinke Peng, Jianjun He, Jian Chen

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引用次数: 0

Abstract

Sepiolite (ST) was used as a supporting matrix in compiste phase change materials (PCMs) due to its unique microstructure, good thermal stability, and other raw material advantages. In this paper, microwave acid treatment were innovatively used for the modification of sepiolite. The modified sepiolite (ST_m) obtained in different hydrochloric acid concentrations (0.25, 0.5, 0.75, and 1.0 mol·L⁻¹) was added to stearic acid (SA) via vacuum impregnation method. The thermophysical properties of the composites were changed by varying the hydrochloric acid concentration. The SA-ST_m0.5 obtained by microwave acid treatment at 0.5 mol·L⁻¹ hydrochloric acid concentration showed a higher loading capacity (82.63%) than other composites according to the differential scanning calorimeter (DSC) analysis. The melting and freezing enthalpies of SA-ST_m0.5 were of 152.30 and 148.90 J·g⁻¹, respectively. The thermal conductivity of SA-ST_m0.5 was as high as 1.52 times that of pure SA. In addition, the crystal structure, surface morphology, and microporous structure of ST_m were studied, and the mechanism of SA-ST_m0.5 performance enhancement was further revealed by Brunauere Emmett Teller (BET) analysis. Leakage experiment showed that SA-ST_m0.5 had a good morphological stability. These results demostrate that SA-ST_m0.5 has a potential application in thermal energy storage.

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改性海泡石稳定硬脂酸作为一种形态稳定的相变储热材料

海泡石(ST)由于其独特的微观结构、良好的热稳定性以及其他原料优势，被用作复合相变材料(PCMs)的支撑基体。本文创新性地采用微波酸处理技术对海泡石进行改性。将不同盐酸浓度(0.25、0.5、0.75、1.0 mol·L−1)下得到的改性海泡石(STm)通过真空浸渍法加入硬脂酸(SA)中。不同浓度的盐酸改变了复合材料的热物理性能。差示扫描量热仪(DSC)分析表明，在0.5 mol·L−1盐酸浓度下，微波酸处理得到的SA-STm0.5复合材料的负载能力(82.63%)高于其他复合材料。SA-STm0.5的熔化焓和冻结焓分别为152.30和148.90 J·g−1。SA- stm0.5的导热系数高达纯SA的1.52倍。此外，研究了STm的晶体结构、表面形貌和微孔结构，并通过BET分析进一步揭示了SA-STm0.5性能增强的机理。泄漏实验表明，SA-STm0.5具有良好的形态稳定性。这些结果表明，SA-STm0.5在储热方面具有潜在的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Minerals, Metallurgy, and Materials 工程技术-材料科学：综合

CiteScore

9.30

自引率

16.70%

发文量

205

审稿时长

2 months

期刊介绍： International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.