纳米孔
离子键合
扩散
化学物理
电流(流体)
离子
极化(电化学)
浓差极化
分析化学(期刊)
物理
纳米技术
热力学
材料科学
化学
物理化学
膜
色谱法
生物化学
量子力学
作者
Long Ma,Zihao Gao,Jia Man,Jianyong Li,Guohao Du,Yinghua Qiu
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2023-09-01
卷期号:35 (9)
被引量:1
摘要
In charged nanopores, ionic diffusion current reflects the ionic selectivity and ionic permeability of nanopores, which determines the performance of osmotic energy conversion, i.e., the output power and efficiency. Here, theoretical predictions of the diffusive currents through cation-selective nanopores have been developed based on the investigation of diffusive ionic transport under salt gradients with simulations. The ionic diffusion current I satisfies a reciprocal relationship with the pore length I ∝ α/L (α is a constant) in long nanopores. α is determined by the cross-sectional areas of diffusion paths for anions and cations inside nanopores, which can be described with a quadratic power of the diameter, and the superposition of a quadratic power and a first power of the diameter, respectively. By using effective concentration gradients instead of nominal ones, the deviation caused by the concentration polarization can be effectively avoided in the prediction of ionic diffusion current. With developed equations of effective concentration difference and ionic diffusion current, the diffusion current across nanopores can be well predicted in cases of nanopores longer than 100 nm and without overlapping of electric double layers. Our results can provide a convenient way for the quantitative prediction of ionic diffusion currents under salt gradients.
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