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通过热流法制备具有原始石墨烯的各向异性气凝胶及其对石蜡传热影响的研究

Preparation of Anisotropic Aerogels with Pristine Graphene by Heat Flow and Study of Their Effects on Heat Transfer in Paraffin.

作者信息

Huang Jinhui, Zhang Buning, He Ming, Huang Xue, Yin Guoqiang, Cui Yingde

机构信息

School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.

Guangzhou Key Laboratory for Efficient Utilization of Agricultural Chemicals, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.

出版信息

Nanomaterials (Basel). 2019 Nov 15;9(11):1622. doi: 10.3390/nano9111622.

DOI:10.3390/nano9111622
PMID:31731702
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6915352/
Abstract

In this study, anisotropic graphene/graphene oxide (GO) aerogels (AGAs) were obtained by freeze-drying after direct participation of pristine graphene in the self-assembly of anisotropic gel by the heat flow method. After vacuum microwave treatment, the physical, chemical and structural characteristics of the AGAs were investigated. The results show that AGAs, in which the internal graphene sheets are parallel to the heat flow direction, are successfully prepared. After microwave treatment, the amount of oxygen and nitrogen reduces significantly and the sp2 domain increases. However, at the same time, many fragments and holes are generated in the graphene sheets. The effects of AGAs on the phase transition of paraffin is studied, and the results show that the melting enthalpy, solidification enthalpy and initial melting temperature of AGA/paraffin composites decreases as the GO content in the AGAs increases, whereas the melting range, solidifying range and subcooling degree increases. The highest axial thermal conductivity of the AGA/paraffin composite is 1.45 W/(mK), and the thermal conductivity enhancement efficiency is 884% (AGA content was 0.53 vol %). Compared with previously investigated, similar AGA/paraffin composites, the aerogels fabricated in this study have the obvious advantages of a simple fabrication process, a low cost and a high thermal conductivity enhancement efficiency. These aerogels possess the potential for application in phase-change energy storage (PES), thermal energy management and other fields.

摘要

在本研究中，通过热流法使原始石墨烯直接参与各向异性凝胶的自组装后，经冷冻干燥获得了各向异性石墨烯/氧化石墨烯（GO）气凝胶（AGA）。经过真空微波处理后，对AGA的物理、化学和结构特性进行了研究。结果表明，成功制备了内部石墨烯片层与热流方向平行的AGA。微波处理后，氧和氮的含量显著降低，sp2域增加。然而，与此同时，石墨烯片层中产生了许多碎片和孔洞。研究了AGA对石蜡相变的影响，结果表明，随着AGA中GO含量的增加，AGA/石蜡复合材料的熔化焓、凝固焓和初始熔化温度降低，而熔化范围、凝固范围和过冷度增加。AGA/石蜡复合材料的最高轴向热导率为1.45W/（mK），热导率增强效率为884%（AGA含量为0.53体积%）。与先前研究的类似AGA/石蜡复合材料相比，本研究制备的气凝胶具有制备工艺简单、成本低和热导率增强效率高的明显优势。这些气凝胶在相变储能（PES）、热能管理等领域具有应用潜力。

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