Chaotropic Monovalent Anion-Induced Rectification Inversion at Nanopipettes Modified by Polyimidazolium Brushes

Angewandte Chemie
Xiulan HeLanqun Mao

Abstract

A nonintuitive observation of monovalent anion-induced ion current rectification inversion at polyimidazolium brush (PimB)-modified nanopipettes is presented. The rectification inversion degree is strongly dependent on the concentration and species of monovalent anions. For chaotropic anions (for example, ClO4- ), the rectification inversion is easily observed at a low concentration (5 mm), while there is no rectification inversion observed for kosmotropic anions (Cl- ) even at a high concentration (1 m). Moreover, at the specific concentration (for example, 10 mm), the variation of rectification ratio on the type of anions is ranged by Hofmeister series (Cl- ≥NO3- >BF4- >ClO4- >PF6- >Tf2 N- ). Estimation of the electrokinetic charge density (σek ) demonstrates that rectification inversion originates from the charge inversion owing to the over-adsorption of chaotropic monovalent anion. To qualitatively understand this phenomenon, a concentration-dependent adsorption mechanism is proposed.

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Citations

Mar 29, 2019·Physical Chemistry Chemical Physics : PCCP·Jyh-Ping HsuShiojenn Tseng
Sep 10, 2019·Organic & Biomolecular Chemistry·Abderrahman El BouakherSébastien Comesse
Oct 12, 2019·Angewandte Chemie·Jiarong CaiChuanlai Xu
Apr 16, 2020·Soft Matter·Haiyang Yuan, Guangming Liu
May 29, 2020·ACS Applied Materials & Interfaces·Chen ZhaoHuanting Wang
Dec 5, 2020·ACS Central Science·Weipeng ChenLiping Wen
Mar 18, 2020·Analytical Chemistry·Si-Min LuYi-Tao Long
Jul 1, 2020·Journal of the American Chemical Society·Xiulan He, Andrew G Ewing
Sep 15, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhan WangZhi-Yuan Gu

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