论文标题
润湿磁滞可诱导有效的单向水通过波动的纳米通道传输
Wetting hysteresis induces effective unidirectional water transport through a fluctuating nanochannel
论文作者
论文摘要
我们提出了一个积极通过纳米通道运输水分子的水泵。在通道半径上施加的空间不对称热波动会导致单向水流而没有渗透压，这可以归因于润湿/干燥状态之间的环状过渡中的滞后。我们表明，水的运输取决于波动，例如白色，布朗和粉红色的噪声。由于白噪声中的高频组件，开放和关闭状态的快速切换会抑制通道润湿。相反，粉红色和棕色的声音会产生高通滤网的净流。布朗的波动导致了更快的水传输速率，而粉红色的噪声具有更高的能力，可以在相反的方向上克服渗透压。波动的谐振频率与流动扩增之间存在权衡关系。所提出的泵可以将其视为反向Carnot循环的类比，这是能量转化效率的上限。
We propose a water pump that actively transports water molecules through nanochannels. Spatially asymmetric thermal fluctuations imposed on the channel radius cause unidirectional water flow without osmotic pressure, which can be attributed to hysteresis in the cyclic transition between the wetting/drying states. We show that the water transport depends on fluctuations, such as white, Brownian, and pink noises. Because of the high-frequency components in white noise, fast switching of open and close states inhibits channel wetting. Conversely, pink and Brownian noises generate high-pass filtered net flow. Brownian fluctuation leads to a faster water transport rate, whereas pink noise has a higher capability to overcome osmotic pressure in the opposite direction. A trade-off relationship exists between the resonant frequency of the fluctuation and the flow amplification. The proposed pump can be considered as an analogy for the reversed Carnot cycle, which is the upper limit on the energy conversion efficiency.
