Self-Exfoliation of Flake Graphite for Bioinspired Compositing with Aramid Nanofiber toward Integration of Mechanical and Thermoconductive Properties.
Self-Exfoliation of Flake Graphite for Bioinspired Compositing with Aramid Nanofiber toward Integration of Mechanical and Thermoconductive Properties.
复制标题
片状石墨自剥离用于芳纶纳米纤维仿生复合材料的力学和导热性能集成。
DOI：
10.1007/s40820-022-00919-0
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发表时间：
2022-08-20
影响因子：
26.6
通讯作者：
Wang, Jianfeng
中科院分区：
文献类型：
--
作者：
Huang, Limei;Xiao, Guang;Wang, Yunjing;Li, Hao;Zhou, Yahong;Jiang, Lei;Wang, Jianfeng
利用鳞片石墨颗粒之间的相互剪切摩擦，成功地开发了一种自磨剥离策略，大大提高了原始石墨烯的产率和生产率。通过连续的溶胶-凝胶-薄膜转化策略，通过生物灵感将原始石墨烯纳米片组装成相互连接的芳纶纳米纤维网络，并生成灵活但高度导热的薄膜。柔性但高导热材料对于下一代柔性电子器件的发展至关重要。在这里，我们报道了一种基于自剥离原始石墨烯和三维芳纶纳米纤维网络的集大延展性和高导热性能于一体的生物启发纳米结构薄膜。通过石墨颗粒之间的相互剪切摩擦，成功地开发了一种自研磨方法，将鳞片石墨直接剥离成少层和少缺陷的原始石墨烯，与常规的液体剥离方法(如超声波、高剪切混合和球磨)相比，大大提高了产率和生产率。受珍珠层的启发，提出了一种新的包含三维纳米纤维网络的生物灵感层状结构设计模型，并通过发展的溶胶-凝胶-薄膜转化的连续组装策略实现了互联的芳纶纳米纤维网络和高负载石墨烯纳米片。结果表明，这种仿生薄膜不仅通过释放弯曲的芳纶纳米纤维的隐藏长度而表现出珍珠层状的延性变形行为，而且通过沿原始石墨烯纳米片定向导热而具有良好的热传输能力。网上版载有补充材料，可在10.1007/s40820-022-00919-0查阅。
A self-grinding exfoliation strategy that depends on mutual shear friction between flake graphite particles is successfully developed to prepare pristine graphene with largely enhanced yield and productivity. Bioinspired assembly of pristine graphene nanosheets to an interconnected aramid nanofiber network is achieved by a continuous sol-gel-film transformation strategy and generates a flexible yet highly thermoconductive film. Flexible yet highly thermoconductive materials are essential for the development of next-generation flexible electronic devices. Herein, we report a bioinspired nanostructured film with the integration of large ductility and high thermal conductivity based on self-exfoliated pristine graphene and three-dimensional aramid nanofiber network. A self-grinding strategy to directly exfoliate flake graphite into few-layer and few-defect pristine graphene is successfully developed through mutual shear friction between graphite particles, generating largely enhanced yield and productivity in comparison to normal liquid-based exfoliation strategies, such as ultrasonication, high-shear mixing and ball milling. Inspired by nacre, a new bioinspired layered structural design model containing three-dimensional nanofiber network is proposed and implemented with an interconnected aramid nanofiber network and high-loading graphene nanosheets by a developed continuous assembly strategy of sol–gel-film transformation. It is revealed that the bioinspired film not only exhibits nacre-like ductile deformation behavior by releasing the hidden length of curved aramid nanofibers, but also possesses good thermal transport ability by directionally conducting heat along pristine graphene nanosheets. The online version contains supplementary material available at 10.1007/s40820-022-00919-0.
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