The ultrafast water transport in graphene nanoplatelets (GNPs) coating is attributed to the low friction passages formed by pristine graphene and the hydrophilic functional groups which provide a strong interaction force to the water molecules. Here, we examine the influence of the supporting substrate on the ultrafast water transport property of multilayer graphene coatings experimentally and by computational modelling. Thermally cured GNPs manifesting ultrafast water permeation are coated on different substrate materials, namely aluminium, copper, iron and glass. The physical and chemical structures of the GNPs coatings which are affected by the substrate materials are characterized using various spectroscopy techniques. Experimentally, the water permeation and absorption tests evidence the significant influence of the substrate on the rapid water permeation property of GNPs-coating. The water transport rates of the GNPs coatings correspond to the wettability and the free surface energy of their substrates where the most hydrophilic substrate induces the highest water transport rate. In addition, we conduct molecular dynamics (MD) simulations to investigate the transport rate of water molecules through multilayer GNPs adjacent to different substrate materials. The MD simulations results agree well with the experimental results inferring the strong influence of the substrate materials on the fast water transport of GNPs. Therefore, selection of substrate has to be taken into consideration when the GNPs-coating is placed into applications.

中文翻译：

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基材对多层石墨烯涂层超快水传输性能的影响

石墨烯纳米片（GNPs）涂层中的超快水传输归因于由原始石墨烯和亲水官能团形成的低摩擦通道，这些官能团为水分子提供了强大的相互作用力。在这里，我们通过实验和计算建模来检查支撑基材对多层石墨烯涂层的超快水传输性能的影响。表现出超快水渗透的热固化 GNP 被涂覆在不同的基材材料上，即铝、铜、铁和玻璃。受基材影响的 GNPs 涂层的物理和化学结构使用各种光谱技术进行表征。实验上，水渗透和吸收测试证明了基材对 GNPs 涂层的快速水渗透性能的显着影响。GNPs 涂层的水传输速率与其基材的润湿性和自由表面能相对应，其中最亲水的基材诱导最高的水传输速率。此外，我们进行了分子动力学 (MD) 模拟，以研究水分子通过与不同基板材料相邻的多层 GNP 的传输速率。MD 模拟结果与实验结果非常吻合，推断基底材料对 GNP 的快速水传输有很强的影响。因此，在将 GNPs 涂层置于应用中时，必须考虑基材的选择。GNPs 涂层的水传输速率与其基材的润湿性和自由表面能相对应，其中最亲水的基材诱导最高的水传输速率。此外，我们进行了分子动力学 (MD) 模拟，以研究水分子通过与不同基板材料相邻的多层 GNP 的传输速率。MD 模拟结果与实验结果非常吻合，推断基底材料对 GNP 的快速水传输有很强的影响。因此，在将 GNPs 涂层置于应用中时，必须考虑基材的选择。GNPs 涂层的水传输速率与其基材的润湿性和自由表面能相对应，其中最亲水的基材诱导最高的水传输速率。此外，我们进行了分子动力学 (MD) 模拟，以研究水分子通过与不同基板材料相邻的多层 GNP 的传输速率。MD 模拟结果与实验结果非常吻合，推断基底材料对 GNP 的快速水传输有很强的影响。因此，在将 GNPs 涂层置于应用中时，必须考虑基材的选择。