https://scholars.lib.ntu.edu.tw/handle/123456789/598232
標題: | Space charge modulation and ion current rectification of a cylindrical nanopore functionalized with polyelectrolyte brushes subject to an applied pH-gradient | 作者: | Chen Y.-T Hsu J.-P. JYH-PING HSU |
關鍵字: | Applied pH-gradient;Cylindrical nanopore;Ion current rectification;Polyelectrolyte brushes;Space charge modulation;Electroosmosis;Ions;Nanopores;pH;Polyelectrolytes;Bio-inspired membranes;Cylindrical nanopores;Electroosmotic flow;Ion current rectifications;Optimum performance;Possible mechanisms;Rectification factors;Electric rectifiers;polyelectrolyte;electroosmosis;ion transport;nanopore;Hydrogen-Ion Concentration;Ion Transport | 公開日期: | 2022 | 卷: | 605 | 起(迄)頁: | 571-581 | 來源出版物: | Journal of Colloid and Interface Science | 摘要: | Considering versatile potential applications of bioinspired membranes, we simulate the electrokinetic behavior of a cylindrical nanopore, surface modified by a polyelectrolyte (PE) layer. Taking account of the effect of electroosmotic flow and an additionally applied pH gradient, the influences of the strength of the pH gradient, the PE layer thickness, the length of the nanopore and its radius on its conductance and ion current rectification (ICR) performance are assessed. We show that if pHU (the pH at the higher pH end of the nanopore) is fixed at 11 and pHL (the pH at the lower pH end of the nanopore) varies from 3 to 11, the rectification factor Rf has a local maximum occurring in 6 < pHL <8; the greater the magnitude of the applied potential bias |V| the smaller the pHL at which the local maximum occurs. The influence of the PE layer thickness on the nanopore rectification performance is important only if 5 < pHL <8, and the optimum performance is reached at a medium thick PE layer (ca. 3 nm). Possible mechanisms associated with the ion transport phenomenon under consideration are proposed and discussed in detail. ? 2021 Elsevier Inc. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111504580&doi=10.1016%2fj.jcis.2021.07.120&partnerID=40&md5=5d50b4db4ef88da0051acf76a3538001 https://scholars.lib.ntu.edu.tw/handle/123456789/598232 |
ISSN: | 00219797 | DOI: | 10.1016/j.jcis.2021.07.120 |
顯示於: | 化學工程學系 |
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