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Ionic Current Rectification in Organic Solutions with Quartz Nanopipettes
journal contribution
posted on 2015-09-01, 00:00 authored by Xiaohong Yin, Shudong Zhang, Yitong Dong, Shujuan Liu, Jing Gu, Ye Chen, Xin Zhang, Xianhao Zhang, Yuanhua ShaoThe
study of behaviors of ionic current rectification (ICR) in
organic solutions with quartz nanopipettes is reported. ICR can be
observed even in organic solutions using quartz pipettes with diameters
varied from several to dozens of nanometers, and the direction of
ICR is quite different from the ICR observed in aqueous phase. The
influences of pore size, electrolyte concentration, and surface charge
on the ICR have been investigated carefully. Water in organic solutions
affects the direction and extent of ICR significantly. Mechanisms
about the formation of an electrical double layer (EDL) on silica
in organic solutions with different amount of water have been proposed.
An improved method, which can be employed to detect trace water in
organic solutions, has been implemented based on Au ultramicroelectrodes
with cathodic differential pulse stripping voltammetry.