An Electrically Actuated, Carbon-Nanotube-Based Biomimetic Ion Pump.,Nano Letters

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An Electrically Actuated, Carbon-Nanotube-Based Biomimetic Ion Pump.
Nano Letters ( IF 9.6 ) Pub Date : 2019-12-26 , DOI: 10.1021/acs.nanolett.9b04552
Jake Rabinowitz ₁ , Charishma Cohen ₁ , Kenneth L Shepard _{1,

2}

Affiliation

Single-walled carbon nanotubes (SWCNTs) are well-established transporters of electronic current, electrolyte, and ions. In this work, we demonstrate an electrically actuated biomimetic ion pump by combining these electronic and nanofluidic transport capabilities within an individual SWCNT device. Ion pumping is driven by a solid-state electronic input, as Coulomb drag coupling transduces electrical energy from solid-state charge along the SWCNT shell to electrolyte inside the SWCNT core. Short-circuit ionic currents, measured without an electrolyte potential difference, exceed 1 nA and scale larger with increasing ion concentrations through 1 M, demonstrating applicability under physiological (∼140 mM) and saltwater (∼600 mM) conditions. The interlayer coupling allows ionic currents to be tuned with the source-drain potential difference and electronic currents to be tuned with the electrolyte potential difference. This combined electronic-nanofluidic SWCNT device presents intriguing applications as a biomimetic ion pump or component of an artificial membrane.

中文翻译：

电动碳纳米管仿生离子泵。

单壁碳纳米管（SWCNT）是电流，电解质和离子的公认转运蛋白。在这项工作中，我们通过在单个SWCNT装置中结合这些电子和纳米流体传输能力，展示了一种电动仿生离子泵。离子泵浦由固态电子输入驱动，因为库仑拖曳耦合将电能从固态电荷沿着SWCNT外壳传递到SWCNT内核内部的电解质。在没有电解质电势差的情况下测得的短路离子电流超过1 nA，并且随着离子浓度增加到1 M，其比例会增大，这证明了其在生理条件（〜140 mM）和盐水（〜600 mM）下的适用性。层间耦合允许离子电流与源极-漏极电势差进行调整，而电子电流与电解质电势差进行调整。这种组合的电子-纳米流体SWCNT装置作为仿生离子泵或人造膜的组成部分，引起了人们的兴趣。

更新日期：2019-12-30

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