Preparation and characterization of palmitic acid/graphene nanoplatelets composite with remarkable thermal conductivity as a novel shape-stabilized phase change material
Preparation and characterization of palmitic acid/graphene nanoplatelets composite with remarkable thermal conductivity as a novel shape-stabilized phase change material
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DOI：
10.1016/j.applthermaleng.2013.08.035
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发表时间：
2013-11-03
影响因子：
6.4
通讯作者：
Akhiani, Amir Reza
中科院分区：
文献类型：
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作者：
Mehrali, Mohammad;Latibari, Sara Tahan;Akhiani, Amir Reza
本文主要研究棕榈酸(PA)/石墨烯纳米片(GNPs)复合相变材料(PCM)的形状稳定性和导热性能。采用浸渍法制备了比表面积分别为300、500和750m(2)/g的GNPs定形相变材料，滴点测试表明，GNPs对PA的最大质量百分含量为91.94wt%，熔融状态下无PA泄漏。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪和傅立叶红外光谱仪分别对棕榈酸/GNPs复合材料的微观结构和化学结构进行了表征。用差示扫描量热仪(DSC)测试了材料的热性能，包括熔融、凝固温度和潜热。热重分析(TGA)结果表明，加入GPNS后，PA的热稳定性提高。通过2500次熔融和冷冻循环试验，确定了复合相变材料的热可靠性和化学稳定性。经计算，导热系数的提高是PA的10倍。因此，由于其良好的热性能、良好的热可靠性、化学稳定性和良好的导热性能，我们可以认为所制备的形状稳定的复合材料是用于储能应用的高导电性相变材料。(C)2013爱思唯尔有限公司。保留所有权利。
This paper mainly concentrates on the shape stability and thermal conductivity of palmitic acid (PA)/graphene nanoplatelets (GNPs) composite phase change material (PCM). The impregnation method was done to prepare shape stabilized PCM with GNPs for three different specific surface areas of 300, 500 and 750 m(2)/g. The maximum mass percentage of PA absorbed by GNPs was 91.94 wt% without leakage of PA in molten state as proven by dropping point test. Scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray diffractometer (XRD) and Fourier transform infrared spectroscope (FTIR) were applied to determine microstructure and chemical structure of palmitic acid (PA)/GNPs composites, respectively. Differential scanning calorimeter (DSC) test was done to investigate thermal properties which include melting and solidification temperatures and latent heats. The thermogravimetric analyzer (TGA) results show that thermal stability of PA was increased by using GPNs. The thermal reliability and chemical stability of composite PCM were determined by cycling test for 2500 cycles of melting and freezing. The improvement of thermal conductivity was calculated to be 10 times that of the PA. As a result, due to their acceptable thermal properties, good thermal reliability, chemical stability and great thermal conductivities, we can consider the prepared shape-stabilized composites as highly conductive PCMs for thermal energy storage applications. (C) 2013 Elsevier Ltd. All rights reserved.