Nanoparticle-induced rectification in a single cylindrical nanopore: Net currents from zero time-average potentials
Nanoparticle-induced rectification in a single cylindrical nanopore: Net currents from zero time-average potentials
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DOI：
10.1063/1.4863511
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发表时间：
2014-01-27
影响因子：
4
通讯作者：
Mafe, Salvador
中科院分区：
文献类型：
--
作者：
Ali, Mubarak;Ramirez, Patricio;Mafe, Salvador
纳米孔中的整流通常是通过固定的孔几何和电荷分布的不对称性来实现的。我们在这里表明，纳米颗粒阻塞圆柱形孔诱导整流特性，可以支持零时间平均电位的显著净电流。为了在实验上描述这种效应，我们获得了单个纳米孔在不同的电荷状态下的稳态电流-电压曲线，以及孔和带电纳米颗粒的相对大小，它们只存在于一侧。观察到的整流现象可以在纳米流体领域找到应用，并且涉及到离子药物阻断蛋白质离子通道的物理概念。(C) 2014 AIP出版有限责任公司
Rectification in nanopores is usually achieved by a fixed asymmetry in the pore geometry and charge distribution. We show here that nanoparticle blocking of a cylindrical pore induces rectifying properties that can support significant net currents with zero time-average potentials. To describe experimentally this effect, the steady-state current-voltage curves of a single nanopore are obtained for different charge states and relative sizes of the pore and the charged nanoparticles, which are present only on one side. The rectification phenomena observed can find applications in the area of nanofluidics and involves physical concepts that are also characteristic of the blocking of protein ion channels by ionic drugs. (C) 2014 AIP Publishing LLC.