Theoretical study on the massively augmented electro-osmotic water transport in polyelectrolyte brush functionalized nanoslits.,Physical Review E

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Theoretical study on the massively augmented electro-osmotic water transport in polyelectrolyte brush functionalized nanoslits.
Physical Review E ( IF 2.2 ) Pub Date : 2020-07-08 , DOI: 10.1103/physreve.102.013103
Vishal Sankar Sivasankar ₁ , Sai Ankit Etha ₁ , Harnoor Singh Sachar ₁ , Siddhartha Das ₁

Affiliation

We demonstrate that functionalizing nanoslits with pH-responsive polyelectrolyte brushes can lead to extremely fast electro-osmotic (EOS) water transport, where the maximum centreline velocity and the volume flow rate can be an order of magnitude larger than these quantities in identically charged brush-free nanochannels for a wide range of system parameters. Such an enhancement is most remarkable given that the brushes have been known to retard the transport by imparting additional drag on the fluid flow. We argue that this enhancement stems from the localization of the charge density of the brush-induced electric double layer (and, hence, the EOS body force) away from the nanochannel wall (or the location of the wall-induced drag force). This ensures a much larger impact of the EOS body force triggering such fast water transport. Finally, the calculated flux values for the present brush-grafted nanochannels are found to be significantly larger than those for a wide range of nanofluidic membranes and channels, suggesting that the brush functionalization can be considered as a mechanism for enabling such superfast nanofluidic transport.

中文翻译：

在聚电解质刷功能化纳米缝中大量增加电渗水运移的理论研究。

我们证明了用p功能化纳米缝H响应型聚电解质电刷可导致极快速的电渗（EOS）水传输，其中最大中心线速度和体积流率可能比带相同电荷的无电刷纳米通道的大范围的这些值大一个数量级。系统参数。鉴于已知的刷子通过在流体流上施加额外的阻力来阻碍运输，因此这种改进最为显着。我们认为，这种增强是由于电刷诱导的电双层的电荷密度（以及EOS体力）的位置远离纳米通道壁（或壁诱导的阻力的位置）。这确保了触发这样的快速水传输的EOS体力的更大影响。最后，

更新日期：2020-07-08

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