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Combination of micro-computed X-ray tomography and electronic microscopy to understand the influence of graphene nanoplatelets on the thermal conductivity of epoxy composites
Thermochimica Acta ( IF 3.5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.tca.2020.178712
Sebastien Depaifve , Sophie Hermans , David Ruch , Abdelghanni Laachachi

Abstract An innovative combination of micro-computed X-ray tomography (μCT) and electron microscopy (SEM) coupled to an image-processing software was used to study the thermal conductivity of graphene nanoplatelets(GNP)/epoxy composites. This approach afforded a precise and systematic analysis of the dispersion state of the fillers in the epoxy matrix. Here, the influence of GNP aspect ratio on thermal conductivity enhancement (TCE) and the relationship between dispersion state of the fillers and TCE is revealed. The aggregation level of GNP was finely tuned by varying the sonication power. An unexpected trend towards enhanced thermal conductivity upon aggregation of the fillers is demonstrated. Moreover, μCT analysis revealed the encapsulation of micro-voids, undetectable with conventional methods, by large fillers aggregates. This study demonstrates that aggregation of the fillers increases the thermal conductivity of epoxy composites as long as it does not lead to voids encapsulation.

中文翻译:

结合微型计算机 X 射线断层扫描和电子显微镜来了解石墨烯纳米片对环氧树脂复合材料热导率的影响

摘要 将微型计算机 X 射线断层扫描 (μCT) 和电子显微镜 (SEM) 与图像处理软件相结合的创新组合用于研究石墨烯纳米片 (GNP)/环氧树脂复合材料的热导率。这种方法提供了对环氧树脂基体中填料分散状态的精确和系统分析。在这里,揭示了 GNP 纵横比对热导率增强 (TCE) 的影响以及填料的分散状态与 TCE 之间的关系。GNP 的聚集水平通过改变超声功率进行微调。证明了在填料聚集时提高热导率的出乎意料的趋势。此外,μCT 分析揭示了用传统方法无法检测到的微空隙被大型填料聚集体包裹。
更新日期:2020-09-01
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