Wetting hysteresis induces effective unidirectional water transport through a fluctuating nanochannel,Nanoscale Horizons

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Wetting hysteresis induces effective unidirectional water transport through a fluctuating nanochannel
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2023-02-28 , DOI: 10.1039/d2nh00563h
Noriyoshi Arai _{1,

2} , Eiji Yamamoto ₃ , Takahiro Koishi ₄ , Yoshinori Hirano ₁ , Kenji Yasuoka ₁ , Toshikazu Ebisuzaki ₂

Affiliation

We propose a water pump that actively transports water molecules through nanochannels. Spatially asymmetric noise 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 closed 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 pressure differences 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 of the energy conversion efficiency.

中文翻译：

润湿滞后通过波动的纳米通道诱导有效的单向水传输

我们提出了一种通过纳米通道主动输送水分子的水泵。施加在通道半径上的空间不对称噪声波动导致没有渗透压的单向水流，这可归因于润湿/干燥状态之间循环过渡的滞后现象。我们表明，水传输取决于波动，例如白噪声、布朗噪声和粉红噪声。由于白噪声中的高频成分，打开和关闭状态的快速切换会抑制通道润湿。相反，粉红噪声和布朗噪声会产生高通滤波后的净流量。布朗波动导致更快的水传输速率，而粉红噪声具有更高的能力来克服相反方向的压力差。波动的共振频率与流量放大之间存在折衷关系。所提出的泵可以被视为逆卡诺循环的类比，这是能量转换效率的上限。

更新日期：2023-02-28

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