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首页> 外文会议>EPP-vol.6; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >A MICROFABRICATED MULTILAYER IMPEDANCE SYSTEM FOR IONIC TRANSPORT CHARACTERIZATION IN NANOCAPILLARY ARRAYS
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A MICROFABRICATED MULTILAYER IMPEDANCE SYSTEM FOR IONIC TRANSPORT CHARACTERIZATION IN NANOCAPILLARY ARRAYS

机译：纳米毛细管阵列中用于离子传输表征的微细多层阻抗系统

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摘要

A multilayer micro-electrochemical impedance spectroscopic (μ-EIS) system with an integrated Ag/AgCl reference electrode has been developed using MEMS technologies. This μ-EIS system is used to characterize ionic and fluidic transport across nanocapillary array membranes (NCAM), which are comprised of arrays of individual nanopores. Impedance measurements giving magnitude, phase, and I-V characteristics provide insight into the interaction between translocating ions and the electric double layer (EDL) within nanocapillaries due to changes in the surface zeta potential and the ionic charge of the electrolyte. U-EIS measurements for ionic flow through the NCAM with pore diameters from 10 to 800 nm with an aqueous salt solution indicate that these NCAM behave as nearly ideal RC circuits at electrolyte concentrations on the order of 100 mM, when the EDL within these pores do not overlap. Nyquist plots show an increase in the RC time constant with decreasing salt concentration. Under conditions of EDL overlap, hindered transport in the pores causes deviation from ideal RC circuit-like behaviour with the capacitive component of impedance beginning to dominate.
机译：使用MEMS技术开发了具有集成Ag / AgCl参比电极的多层微电化学阻抗谱（μ-EIS）系统。此μ-EIS系统用于表征跨纳米毛细管阵列膜（NCAM）的离子和流体传输，该膜由单个纳米孔的阵列组成。给出幅度，相位和I-V特性的阻抗测量结果使人们能够深入了解由于表面Zeta电位和电解质中离子电荷的变化，纳米级毛细管中易位离子与双电层（EDL）之间的相互作用。用U-EIS测量离子水溶液在盐水溶液中流经直径为10至800 nm的NCAM的离子流时，在电解质浓度约为100 mM时，这些NCAM表现为几乎理想的RC回路不重叠。奈奎斯特图显示，随着盐浓度的降低，RC时间常数增加。在EDL重叠的条件下，孔中的阻碍传输会导致与理想RC电路类似的行为发生偏差，而阻抗的电容成分开始占主导地位。

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