Abstract Functionalized graphene coating possessing the unique property of ultrafast water permeation manifests itself in enhancing the evaporation heat transfer. The intermolecular interactions between the intercalated water molecules with the hydrophobic carbon atoms and the oxygenated functional groups in the graphene nanocapillaries facilitate the magnificent spreadability and permeability of water on a heated surface. The fast water permeation property of graphene can be controlled through a thermal curing process at different curing temperatures. Here we experimentally investigate the application of graphene nanoplatelets (GNPs) coatings for the enhancement of evaporation of small sessile water droplets at sub-boiling temperatures. The ultrafast water permeation within the functionalized nanostructured GNPs facilitates the fast absorption of latent heat of evaporation, leading to the anomalously effective filmwise evaporation. Ultimately, the cooling effectiveness of a water droplet on the GNPs-coated surface is extraordinarily enhanced by an unprecedented maximum of 4866% at a surface temperature of 75 °C compared against the bare surface. These results envision the great potential of graphene-based coatings to address the issues of increased heat generated from the high power density electronics, leading to enhanced performance and extended component lifespans.

中文翻译：

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石墨烯纳米结构涂层表面上水滴的蒸发显着增强

摘要 功能化石墨烯涂层具有独特的超快透水性能，体现在增强蒸发传热。嵌入的水分子与疏水性碳原子和石墨烯纳米毛细管中的氧化官能团之间的分子间相互作用促进了水在加热表面上的良好铺展性和渗透性。石墨烯的快速透水性能可以通过不同固化温度下的热固化过程来控制。在这里，我们通过实验研究了石墨烯纳米片 (GNP) 涂层在亚沸点温度下增强小固着水滴蒸发的应用。功能化纳米结构 GNP 内的超快水渗透促进了蒸发潜热的快速吸收，导致异常有效的薄膜蒸发。最终，与裸露的表面相比，在 75°C 的表面温度下，GNPs 涂层表面上水滴的冷却效率前所未有地提高了 4866%。这些结果预见了石墨烯基涂层在解决高功率密度电子设备产生的热量增加问题方面的巨大潜力，从而提高性能并延长组件寿命。与裸露的表面相比，在 75 °C 的表面温度下，GNPs 涂层表面上水滴的冷却效率前所未有地提高了 4866%。这些结果预见了石墨烯基涂层在解决高功率密度电子设备产生的热量增加问题方面的巨大潜力，从而提高性能并延长组件寿命。与裸露的表面相比，在 75 °C 的表面温度下，GNPs 涂层表面上水滴的冷却效率前所未有地提高了 4866%。这些结果预见了石墨烯基涂层在解决高功率密度电子设备产生的热量增加问题方面的巨大潜力，从而提高性能并延长组件寿命。