A suppress leakage strategy of graphene/paraffin phase change composites: coupled encapsulation of nanoshells and hierarchical frameworks

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

Diamond and Related Materials Pub Date : 2025-04-14 DOI:10.1016/j.diamond.2025.112265

Dong Liu , Li-Rong Fu , Hui Jia , Li-Jing Xie , Fang-Yuan Su , Zheng Wang , Xin-Long Ma , Cheng-Meng Chen

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Abstract

The encapsulation of phase change materials (PCMs) into graphene aerogels (GA) is proven an effective method to prepare composites with high thermal conductivity and excellent shape-stabilization. However, the utilization of PCMs is limited due to the leakage issue during solid-liquid phase trasition, caused by the presence of open micropores at the edge of graphene aerogels. Herein, we demonstrate coupled encapsulation of nanoshells and hierarchical frameworks. Three-dimensional (3D) GA with hierarchical frameworks possesses high capillary force to achieve first encapsulation of paraffin (PW). The dense copper shells coated by magnetron sputtering realize the encapsulation of PW/GA outer layer. The as-obtained composite PCMs exhibit a reduced leakage ratio of 0.29 %, which is much lower than PW/GA of 0.84 %. Simultaneously, the thermal conductivity and phase change latent can be up to 1.22 W·m⁻¹·K⁻¹ and 195.8 J·g⁻¹, respectively. This work provides a new idea for developing PCMs with leakage-free and high heat storage density.

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石墨烯/石蜡相变复合材料的抑制泄漏策略：纳米壳和分层框架的耦合封装

将相变材料（PCMs）封装到石墨烯气凝胶（GA）中是制备具有高导热性和优异形状稳定性的复合材料的有效方法。然而，由于石墨烯气凝胶边缘存在开放的微孔，因此在固液相转变过程中存在泄漏问题，因此pcm的利用受到限制。在这里，我们展示了纳米壳和分层框架的耦合封装。具有层次结构的三维遗传算法具有较高的毛细力，可实现石蜡的首次包封。磁控溅射镀覆致密铜壳，实现了PW/GA外层的封装。所得到的复合PCMs的泄漏比降低了0.29%，远低于PW/GA的0.84%。同时，导热系数和相变潜势分别可达1.22 W·m−1·K−1和195.8 J·g−1。本工作为开发无泄漏、高蓄热密度的相变材料提供了新的思路。

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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.