癸酸-石蜡/石墨烯气凝胶定形相变材料的制备及热物性分析

doi:10.16085/j.issn.1000-6613.2021-2102

化工进展 ›› 2022, Vol. 41 ›› Issue (8): 4441-4448.DOI: 10.16085/j.issn.1000-6613.2021-2102

癸酸-石蜡/石墨烯气凝胶定形相变材料的制备及热物性分析

白金刚¹^,²(), 苑正己¹^,², 刘雨¹, 张义师¹, 吕喜风¹^,²^,³()

^1.塔里木大学化学化工学院，新疆阿拉尔 843300
^2.新疆兵团南疆化工资源利用工程实验室，新疆阿拉尔 843300
^3.北京化工大学有机无机复合材料国家重点实验室，北京 100029

收稿日期:2021-10-11 修回日期:2021-12-08 出版日期:2022-08-25 发布日期:2022-08-22
通讯作者: 吕喜风
作者简介:白金刚（2000—），男，本科生。E-mail：2898492512@qq.com。
基金资助:
有机无机复合材料国家重点实验室开放课题(oic-202001011);国家自然科学基金(21968031);塔里木大学物理化学一流本科课程建设(TDYLKC202121);“课程思政”教学研究中心专项(TDGJSZ2109);物理化学课程思政示范团队项目(TDKCSZ12101)

Fabrication and thermal properties of decanoic acid-paraffin/graphene aerogel form-stable phase change materials

BAI Jingang¹^,²(), YUAN Zhengji¹^,², LIU Yu¹, ZHANG Yishi¹, LYU Xifeng¹^,²^,³()

^1.College of Chemistry and Chemical Engineering, Tarim University, Alar 843300, Xinjiang, China
^2.Engineering Laboratory of Chemical Resources Utilization in South Xinjiang of Xinjiang Production and Construction Corps, Alar 843300, Xinjiang, China
^3.State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology，Beijing 100029, China

Received:2021-10-11 Revised:2021-12-08 Online:2022-08-25 Published:2022-08-22
Contact: LYU Xifeng

摘要/Abstract

摘要：

随着碳中和理念的逐步推进，调整能源供应政策，倡导低碳生活，可推动全社会的绿色发展，采用相变材料（PCMs）储存和释放热量，能够有效地利用可再生能源，可减少化石燃料带来的CO₂释放问题。本文利用石墨烯气凝胶作为相变材料的载体，分别采用不同比例的癸酸/石蜡进行有机相耦合，制备了一系列高封装率、低渗漏率的石墨烯定形相变材料。研究发现当石墨烯气凝胶定形相变材料中癸酸/石蜡为7∶3时，相变焓达到202.91J/g。经过200次循环后复合材料的相变潜热变化量在4.25%以内，渗漏率仅为3.20%。采用DSC、TG、XRD、SEM对材料进行微观结构分析说明，石墨烯气凝胶改善了相变介质的形状稳定性，有效地阻止了相变过程中耦合的有机相泄漏，使材料储放热稳定，增强了导热作用，具有良好的应用前景。

关键词: 石墨烯气凝胶, 有机相耦合, 低渗漏, 定形相变材料

Abstract:

With the gradual advancement of the concept of carbon neutrality, adjusting energy supply policies and advocating low-carbon life can promote the green development of the whole society. The use of phase change materials (PCMs) to store and release heat can effectively use renewable energy and reduce the issue of CO₂ emissions caused by fossil fuels. In this paper, graphene aerogel is used as the carrier of phase change materials, and a series of graphene phase change materials with high coating rate and low leakage rate are prepared by using different ratios of decanoic acid/paraffin for organic phase coupling. The study finds that when the decanoic acid/paraffin wax ratio of the graphene aerogel shaped phase change material is 7∶3, the phase change enthalpy reaches 202.91J/g. After 200 cycles, the phase change latent heat change of the composite material is within 4.25%, and the leakage rate is only 3.20%. The use of DSC, TG, XRD, SEM to analyze the microstructure of the material shows that graphene aerogel improves the shape stability of the phase change medium, effectively prevents the coupled organic phase during the phase change process from leaking, and enables the material to store and release heat stably, enhances the thermal conductivity, and has good application prospects.

Key words: graphene aerogel, organic phase coupling, low leakage, form-stable phase change materials

中图分类号:

O642

白金刚, 苑正己, 刘雨, 张义师, 吕喜风. 癸酸-石蜡/石墨烯气凝胶定形相变材料的制备及热物性分析[J]. 化工进展, 2022, 41(8): 4441-4448.

BAI Jingang, YUAN Zhengji, LIU Yu, ZHANG Yishi, LYU Xifeng. Fabrication and thermal properties of decanoic acid-paraffin/graphene aerogel form-stable phase change materials[J]. Chemical Industry and Engineering Progress, 2022, 41(8): 4441-4448.

图/表 13

图1 定形相变材料制备示意图

图2 不同比例耦合介质的复合材料DSC曲线

表1 四种材料的熔点及熔融焓

PCM	熔点/℃	熔融焓/J·g^-1
PW	49.2	213.67
PW/GA	49.4	206.61
CA	28.9	157.81
CA/GA	29.1	155.90

图3 有机相封装率

图4 石墨烯气凝胶的形貌

图5 单体粒径形貌与粒径分布

图6 颗粒的面积与周长分布

图7 相变介质与复合材料的XRD图

图8 相变材料TG曲线对比

图9 两种材料形状稳定性随温度变化图

图10 DSC循环曲线

图11 循环后的焓值与渗漏率

表2 不同相变材料相变温度和焓值比较

样品	T_m/℃	ΔH_m/J·g^-1	参考文献
CA-PW	27.0	153.70	［23］
CA-PW-GO	27.4	144.40	［21］
CA-PW-GA	32.2	202.91	本研究

参考文献 23

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癸酸-石蜡/石墨烯气凝胶定形相变材料的制备及热物性分析

Fabrication and thermal properties of decanoic acid-paraffin/graphene aerogel form-stable phase change materials

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