Wetting hysteresis induces effective unidirectional water transport through a fluctuating nanochannel
Wetting hysteresis induces effective unidirectional water transport through a fluctuating nanochannel
复制标题
润湿滞后作用通过波动纳米通道诱导有效的单向水传输
DOI：
10.1039/d2nh00563h
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发表时间：
2023
影响因子：
9.7
通讯作者：
Ebisuzaki Toshikazu
中科院分区：
文献类型：
--
作者：
Arai Noriyoshi;Yamamoto Eiji;Koishi Takahiro;Hirano Yoshinori;Yasuoka Kenji;Ebisuzaki Toshikazu
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会导致没有渗透压的单向水流，这可归因于润湿/干燥状态之间循环转换的滞后现象。我们证明水的传输取决于波动，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。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。波动的共振频率和流量放大之间存在权衡关系。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。
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.