A simple electrochemical methodology for evaluation of the velocity of electroosmotic flow at the tip of polarized microcapillary. (20th February 2015)

• Record Type: Journal Article
• Authors: Silver, Barry R.; Holub, Karel; Mareček, Vladimír
• Is Part Of: Electrochimica acta. Volume 156(2015)
• Page Start: 316
• Page End: 320
• Publication Date: 2015-02-20
• Subjects: ion transport -- electroosmotic flow -- AC impedance -- pseudo-inductive behaviour -- microcapillary.; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2014.07.144
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A simple electrochemical methodology for evaluation of the velocity of electroosmotic flow at the tip of a polarized microcapillary is herein described. The methodology relies on the application of a composite, potentiostatically-controlled voltage signal which comprises both AC and DC polarization components. Subsequent analysis of the current-time response yields an approximation for the velocity of electroosmotic flow at the microcapillary tip. Using this methodology, it is also herein shown, that previously observed low-frequency pseudo-inductive behaviour is related to an accumulation of ions into the capillary tip region under an applied potential via a mechanism based on electroosmosis.