Electrochemical ion transfer across liquid/liquid interfaces confined within solid-state micropore arrays--simulations and experiments

The Analyst
Jörg StrutwolfDamien W M Arrigan

Abstract

Miniaturised liquid/liquid interfaces provide benefits for bioanalytical detection with electrochemical methods. In this work, microporous silicon membranes which can be used for interface miniaturisation were characterized by simulations and experiments. The microporous membranes possessed hexagonal arrays of pores with radii between 10 and 25 microm, a pore depth of 100 microm and pore centre-to-centre separations between 99 and 986 microm. Cyclic voltammetry was used to monitor ion transfer across arrays of micro-interfaces between two immiscible electrolyte solutions (microITIES) formed at these membranes, with the organic phase present as an organogel. The results were compared to computational simulations taking into account mass transport by diffusion and encompassing diffusion to recessed interfaces and overlapped diffusion zones. The simulation and experimental data were both consistent with the situation where the location of the liquid/liquid (l/l) interface was on the aqueous side of the silicon membrane and the pores were filled with the organic phase. While the current for the forward potential scan (transfer of the ion from the aqueous phase to the organic phase) was strongly dependent on the location of the l/l ...Continue Reading

References

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Aug 1, 1998·Analytical Chemistry·Yuanhua Shao, Michael V Mirkin

Citations

Dec 15, 2012·Analytical and Bioanalytical Chemistry·Eva Alvarez de EulateDamien W M Arrigan
Mar 19, 2013·Analytica Chimica Acta·Grégoire Herzog, Valerio Beni
Jun 11, 2010·Physical Chemistry Chemical Physics : PCCP·Micheál D ScanlonDamien W M Arrigan
Oct 23, 2015·Angewandte Chemie·Eva Alvarez de EulateDamien W M Arrigan
Feb 11, 2015·The Analyst·Peter S Toth, Robert A W Dryfe
Mar 11, 2011·Chemical Society Reviews·Shujuan LiuYuanhua Shao

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