纳米孔渗透能量转换的可扩展性

Makusu Tsutsui, Wei-Lun Hsu, Kazumichi Yokota, Iat Wai Leong, Hirofumi Daiguji, Tomoji Kawai
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引用次数: 0

摘要

人工纳米流体网络是一种新兴的蓝色能量转换系统,它利用表面电荷衍生的渗透选择性,在盐度差异条件下通过扩散离子传输产生电压。这里说明了多纳米孔膜中静电通道间耦合的关键意义,它对孔隙率施加了限制,并随后影响了大渗透功率输出的产生。在两个间距为 30 nm 的 20 nm 纳米孔之间观察到了建设性干扰,这种干扰通过恢复的电中性增强了渗透功率输出的选择性。相反,在二维阵列中,干扰具有破坏性,导致离子选择性显著下降,即使是稀疏分布的纳米孔,其间距也比杜欣长度大一个数量级。最重要的是,该研究提供了一个缩放定律,用于推导最大膜面积和孔隙率,以避免孔间静电耦合造成的选择性损失。由于电串扰在任何流体网络中都是不可避免的,因此本研究成果可以为设计用于可扩展渗透发电的纳米多孔膜提供有用的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Scalability of nanopore osmotic energy conversion

Scalability of nanopore osmotic energy conversion

Artificial nanofluidic networks are emerging systems for blue energy conversion that leverages surface charge-derived permselectivity to induce voltage from diffusive ion transport under salinity difference. Here the pivotal significance of electrostatic inter-channel couplings in multi-nanopore membranes, which impose constraints on porosity and subsequently influence the generation of large osmotic power outputs, is illustrated. Constructive interference is observed between two 20 nm nanopores of 30 nm spacing that renders enhanced permselectivity to osmotic power output via the recovered electroneutrality. On contrary, the interference is revealed as destructive in two-dimensional arrays causing significant deteriorations of the ion selectivity even for the nanopores sparsely distributed at an order of magnitude larger spacing than the Dukhin length. Most importantly, a scaling law is provided for deducing the maximal membrane area and porosity to avoid the selectivity loss via the inter-pore electrostatic coupling. As the electric crosstalk is inevitable in any fluidic network, the present findings can be a useful guide to design nanoporous membranes for scalable osmotic power generations.

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