Strong Differential Monovalent Anion Selectivity in Narrow Diameter Carbon Nanotube Porins.,ACS Nano

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Strong Differential Monovalent Anion Selectivity in Narrow Diameter Carbon Nanotube Porins.
ACS Nano ( IF 15.8 ) Pub Date : 2020-04-29 , DOI: 10.1021/acsnano.0c02423
Zhongwu Li _{1,

2} , Yuhao Li ₁ , Yun-Chiao Yao _{1,

3} , Fikret Aydin ₄ , Cheng Zhan ₄ , Yunfei Chen ₂ , Menachem Elimelech ₅ , Tuan Anh Pham ₄ , Aleksandr Noy _{1,

3}

Affiliation

Inner pores of carbon nanotubes combine extremely fast water transport and ion selectivity that could potentially be useful for high-performance water desalination and separation applications. We used dye-quenching halide assays and stopped-flow spectrometry to determine intrinsic permeability of three small monovalent halide anions (chloride, bromide, iodide) and one pseudohalide anion (thiocyanate) through narrow 0.8 nm diameter carbon nanotube porins (CNTPs). These measurements revealed unexpectedly strong differential ion selectivity with permeabilities of different ions varying by up to 2 orders of magnitude. Removal of the negative charge from the nanotube entrance increased anion permeability by only a relatively small factor, indicating that electrostatic repulsion was not a major determinant of CNTP selectivity. First principle molecular dynamics simulations revealed that the origin of this strong differential ion selectivity is partial dehydration of anions upon entry into the narrow CNTP channels.

中文翻译：

窄直径碳纳米管孔中的强差分一价阴离子选择性。

碳纳米管的内孔结合了极快的水传输速度和离子选择性，这可能对高性能的水脱盐和分离应用有用。我们使用染料猝灭卤化物测定法和停止流光谱法测定了三种小的单价卤化物阴离子（氯离子，溴离子，碘离子）和一种假卤离子（硫氰酸根）通过0.8 nm直径的碳纳米管孔（CNTP）的固有渗透性。这些测量结果显示出出乎意料的强大差分离子选择性，不同离子的磁导率变化高达2个数量级。从纳米管入口除去负电荷仅使阴离子渗透性增加一个相对较小的因素，表明静电排斥不是CNTP选择性的主要决定因素。

更新日期：2020-04-29

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