Preparation and properties of Ag nanoparticle-filled expanded graphite paraffin-based composite phase change materials with high temperature response properties

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-06-18 DOI:10.1016/j.diamond.2025.112561

Qin Wu, Yingchen Kang, Zhenhao Tang, Lujun Cui, Xuechun Yan, Zhongjin Ni

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Abstract

Paraffin wax (PW), despite being an excellent energy storage material, suffers from limited applications due to its low thermal conductivity and propensity for liquid-phase leakage. In this study, PW is employed as the phase change material (PCM), expanded graphite (EG) serves as the support material, and silver nanoparticles function as additives to enhance thermal conductivity. Silver-modified expanded graphite (Ag@EG) is synthesized through a liquid-phase reduction process. Subsequently, composite PCMs of Ag@EG/PW with varying mass ratios, which exhibit high thermal conductivity and stability, are fabricated via a vacuum impregnation method. Characterization techniques, including SEM, FTIR, XPS, and SEM-EDX, confirm the existence of Ag in EG in the form of well-dispersed elemental silver. XRD analysis demonstrates the favorable chemical compatibility of the composite PCMs. The prepared composite PCMs all possess a latent heat exceeding 110 J/g. Specifically, the thermal conductivity of the 1wt%Ag@10wt%EG/PW composite PCMs reaches 0.989 W/(m·K), representing a 292.5 % enhancement compared to PW. Additionally, this composite material exhibits excellent thermal cycling stability, anti-leakage properties, and temperature responsiveness. In conclusion, this research is expected to pave the way for the application of Ag@EG/PW composite PCMs in fields where high temperature sensitivity is required.

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具有高温响应性能的Ag纳米颗粒填充膨胀石墨石蜡基复合相变材料的制备与性能

石蜡（PW）尽管是一种优秀的储能材料，但由于其低导热性和液相泄漏倾向，其应用受到限制。在本研究中，PW作为相变材料（PCM），膨胀石墨（EG）作为支撑材料，银纳米颗粒作为添加剂来增强导热性。通过液相还原法合成了银改性膨胀石墨（Ag@EG）。随后，通过真空浸渍法制备了具有高导热性和稳定性的不同质量比Ag@EG/PW复合PCMs。表征技术，包括SEM， FTIR， XPS和SEM- edx，证实Ag以分散良好的元素银的形式存在于EG中。XRD分析表明复合PCMs具有良好的化学相容性。所制备的复合PCMs均具有超过110 J/g的潜热。具体而言，1wt%Ag@10wt%EG/PW复合PCMs的导热系数达到0.989 W/(m·K)，比PW提高了292.5%。此外，这种复合材料具有优异的热循环稳定性、防泄漏性能和温度响应性。总之，本研究有望为Ag@EG/PW复合PCMs在需要高温灵敏度的领域的应用铺平道路。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.