Fast water transport in graphene nanofluidic channels
Fast water transport in graphene nanofluidic channels
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DOI：
10.1038/s41565-017-0031-9
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发表时间：
2018
影响因子：
38.3
通讯作者：
Q. Xie;M. Alibakhshi;Shuping Jiao;Zhiping Xu;M. Hempel;J. Kong;H. Park;Chuanhua Duan
中科院分区：
文献类型：
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作者：
Q. Xie;M. Alibakhshi;Shuping Jiao;Zhiping Xu;M. Hempel;J. Kong;H. Park;Chuanhua Duan
在石墨纳米管道（包括碳纳米管和石墨烯纳米通道）中发现的超快速水传输涉及分离过程和能量转换中的关键应用。然而，在单导管水平上缺乏完整的理解限制了新的碳纳米流体结构和具有实际应用所需传输特性的装置的开发。在这里，我们表明，单石墨烯纳米通道的液压阻力和滑移可以准确地确定使用毛细管流动和一种新的混合纳米通道设计，而无需估计毛细管压力。我们的研究结果表明，石墨烯纳米通道中的石墨烯的滑移长度约为16 nm，尽管与通道高度无关，从0到200 nm有很大的变化。我们证实了这一发现与分子动力学模拟结果，这表明，这种广泛的分布的滑移长度是由于石墨烯的表面电荷以及石墨烯和它的二氧化硅衬底之间的相互作用。
Superfast water transport discovered in graphitic nanoconduits, including carbon nanotubes and graphene nanochannels, implicates crucial applications in separation processes and energy conversion. Yet lack of complete understanding at the single-conduit level limits development of new carbon nanofluidic structures and devices with desired transport properties for practical applications. Here, we show that the hydraulic resistance and slippage of single graphene nanochannels can be accurately determined using capillary flow and a novel hybrid nanochannel design without estimating the capillary pressure. Our results reveal that the slip length of graphene in the graphene nanochannels is around 16 nm, albeit with a large variation from 0 to 200 nm regardless of the channel height. We corroborate this finding with molecular dynamics simulation results, which indicate that this wide distribution of the slip length is due to the surface charge of graphene as well as the interaction between graphene and its silica substrate.