Water flow enhancement in hydrophilic nanochannels
Water flow enhancement in hydrophilic nanochannels
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DOI：
10.1039/c2nr30098b
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Mattia, Davide
中科院分区：
文献类型：
--
作者：
Lee, Kah Peng;Leese, Hannah;Mattia, Davide
所有已发表的关于流体流动增强和水滑移的报告都与疏水表面有关，如碳纳米管。在这里，我们研究了直径从20纳米到100纳米的亲水性氧化铝纳米通道中的水流。对于测试的最小通道，渗透率比使用Hagen-Poiseuille方程的理论预测高出一倍以上。尽管这种增强效果明显小于碳纳米管中测量到的效果，但它清楚地表明，流动增强和水滑移也发生在亲水表面上，这与现有的理论模型相反。据作者所知，这是亲水性表面上的水滑移的第一个实验证明。结果表明，流动增强与纳米通道的表面化学性质、直径和长度有关。
All published reports on fluid flow enhancement and water slippage are associated with hydrophobic surfaces, such as carbon nanotubes. Here, we investigate water flow in hydrophilic alumina nanochannels with diameters ranging from 20 nm to 100 nm. For the smallest channels tested, the water permeability is more than double than the theoretical prediction using the Hagen-Poiseuille equation. Though such an enhancement is significantly smaller than what has been measured in carbon nanotubes, it clearly shows that flow enhancement and water slippage occurs on hydrophilic surfaces as well, contrary to existing theoretical models. To the authors' knowledge, it is the first experimental demonstration of water slippage on hydrophilic surfaces. The results show the dependence of the flow enhancement on the surface chemistry, diameter and length of the nanochannel.