Lee Jung A, Lee Dokeun, Park Sungmin, Lee Hyomin, Kim Sung Jae
Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Institute of Advanced Machines and Design, Seoul National University, Seoul, 08826, Republic of Korea.
Sci Rep. 2018 Aug 27;8(1):12842. doi: 10.1038/s41598-018-29695-x.
While the water impermeable constraint has been conventionally adopted for analyzing the transport phenomena at the interface of electrolyte/nanoporous medium, non-negligible water-permeance through the medium results in significant effect on ion and particle transportation. In this work, a rigorous theoretical and experimental analysis of the water-permeance effect were conducted based on a fully-coupled analytical/numerical method and micro/nanofluidic experiments. The regime diagram with three distinctive types of concentration boundary layers (ion depletion, ion accumulation, and intermediate) near the ion exchange nanoporous medium was proposed depending on the medium's permselectivity and the water-permeance represented by an absorbing parameter. Moreover, the critical absorbing parameters which divide the regimes were analytically obtained so that the bidirectional motion of particles were demonstrated only by altering the water-permeance without external stimuli. Conclusively, the presenting analysis of non-negligible water-permeance would be a substantial fundamental of transport phenomena at the interface of the ion exchange medium and electrolyte, especially useful for the tunable particle/ion manipulations in intermediate Peclet number environment.
虽然传统上采用水不可渗透约束来分析电解质/纳米多孔介质界面处的传输现象，但介质中不可忽略的水渗透率会对离子和颗粒传输产生显著影响。在这项工作中，基于完全耦合的解析/数值方法和微/纳流体实验，对水渗透率效应进行了严格的理论和实验分析。根据离子交换纳米多孔介质的选择透过性和由吸收参数表示的水渗透率，提出了离子交换纳米多孔介质附近具有三种不同类型浓度边界层（离子耗尽、离子积累和中间层）的状态图。此外，通过解析得到了划分这些状态的临界吸收参数，从而仅通过改变水渗透率而无需外部刺激就证明了颗粒的双向运动。总之，对不可忽略的水渗透率的分析将是离子交换介质与电解质界面处传输现象的重要基础，尤其适用于中间佩克莱数环境下的可调谐颗粒/离子操纵。
