Efficient electrochemomechanical energy conversion in nanochannels grafted with end-charged polyelectrolyte brushes at medium and high salt concentration†,Soft Matter

当前位置： X-MOL 学术 › Soft Matter › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Efficient electrochemomechanical energy conversion in nanochannels grafted with end-charged polyelectrolyte brushes at medium and high salt concentration†
Soft Matter ( IF 2.9 ) Pub Date : 2018-05-16 00:00:00 , DOI: 10.1039/c8sm00768c
Guang Chen _{1,

2,

3,

4} , Harnoor Singh Sachar _{1,

2,

3,

4} , Siddhartha Das _{1,

2,

3,

4}

Affiliation

We develop a theory to study the generation of the streaming potential and the resulting electrochemomechanical energy conversion (ECMEC) in the presence of pressure-driven transport in nanochannels grafted with end-charged polyelectrolyte (PE) brushes. Our theory gives a thermodynamically self-consistent coupled description of the PE-brush and the electrostatics of the electric double layer (EDL) induced by the PE charges. The end-charged brushes localize the maximum EDL charge density away from the wall, thereby enabling a larger magnitude of pressure-driven transport to stream the ions downstream. This effect is retarded by the drag force imparted by the brushes as well as by the enhanced electroosmotic transport in a direction opposite to the pressure-driven transport. An interplay of these three issues leads to highly non-trivial electrohydrodynamic transport that eventually allows us to converge on appropriate properties of the brushes (e.g., grafting density and the number of monomers) that lead to the generation of a significantly larger streaming potential and a much improved efficiency of the ECMEC as compared to the brush-free nanochannels particularly at medium and high salt concentrations.

中文翻译：

在中等和高盐浓度下，用末端带电的聚电解质电刷接枝的纳米通道中的高效电化学能量转换†

我们开发了一种理论，以研究在端驱动的聚电解质（PE）刷接枝的纳米通道中存在压力驱动传输的情况下，流电势的产生以及所产生的电化学机械能转换（ECMEC）。我们的理论给出了PE刷和PE电荷引起的双电层（EDL）静电的热力学自洽耦合描述。末端带电刷将最大EDL电荷密度定位在远离壁的位置，从而使更大的压力驱动传输能够将离子流向下游。这种作用被刷子施加的阻力以及与压力驱动的输送相反的方向上增强的电渗输送所阻碍。与无刷纳米通道相比，特别是在中等和高盐浓度下，例如，接枝密度和单体数量）导致产生明显更大的流动电势和ECMEC的效率大大提高。

更新日期：2018-05-16

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南