Abstract A slit structure consisted of two bending graphene membranes is built as a nano check valve theoretically. Molecular dynamics simulations are used to investigate the opening and closing of this check valve. The backflow through the valve are also studied. The results show that the check valve can maintain the unidirectional flow of fluid and prevent backflow within the appropriate pressure range. Specifically, the opening and closing pressure of the valve are 148.2 and 24.6 MPa, respectively. The maximum working pressure of the check valve should be lower than 197.6 MPa. Moreover, the water passing rate is larger at a higher pressure due to the larger slit width and water flux. This check valve is expected to have many potential applications in the nanofluidic field.

中文翻译：

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石墨烯狭缝作为纳米止回阀的合理设计

摘要 从理论上构建了一个由两层弯曲石墨烯薄膜构成的狭缝结构作为纳米止回阀。分子动力学模拟用于研究该止回阀的打开和关闭。还研究了通过阀门的回流。结果表明，止回阀在适当的压力范围内可以保持流体的单向流动并防止回流。具体来说，阀门的启闭压力分别为148.2 MPa和24.6 MPa。止回阀的最大工作压力应低于197.6 MPa。此外，由于较大的狭缝宽度和水通量，水通过率在较高压力下较大。这种止回阀有望在纳米流体领域有许多潜在的应用。