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Kaluza D, Adamiak W, Kalwarczyk T, et al. Anomalous effect of flow rate on the electrochemical behavior at a liquid|liquid interface under microfluidic conditions. Langmuir. 2013;29(51):16034-9doi: 10.1021/la403614z.
Kaluza, D., Adamiak, W., Kalwarczyk, T., Sozanski, K., Opallo, M., & Jönsson-Niedziolka, M. (2013). Anomalous effect of flow rate on the electrochemical behavior at a liquid|liquid interface under microfluidic conditions. Langmuir : the ACS journal of surfaces and colloids, 29(51), 16034-9. https://doi.org/10.1021/la403614z
Kaluza, Dawid, et al. "Anomalous effect of flow rate on the electrochemical behavior at a liquid|liquid interface under microfluidic conditions." Langmuir : the ACS journal of surfaces and colloids vol. 29,51 (2013): 16034-9. doi: https://doi.org/10.1021/la403614z
Kaluza D, Adamiak W, Kalwarczyk T, Sozanski K, Opallo M, Jönsson-Niedziolka M. Anomalous effect of flow rate on the electrochemical behavior at a liquid|liquid interface under microfluidic conditions. Langmuir. 2013 Dec 23;29(51):16034-9. doi: 10.1021/la403614z. Epub 2013 Dec 11. PMID: 24328179.
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Langmuir. 2013 Dec 23;29(51):16034-9. doi: 10.1021/la403614z. Epub 2013 Dec 11.

Anomalous effect of flow rate on the electrochemical behavior at a liquid|liquid interface under microfluidic conditions.

Langmuir : the ACS journal of surfaces and colloids

Dawid Kaluza, Wojciech Adamiak, Tomasz Kalwarczyk, Krzysztof Sozanski, Marcin Opallo, Martin Jönsson-Niedziolka

Affiliations

  1. Institute of Physical Chemistry, Polish Academy of Sciences , Kasprzaka 44/52, 01-224 Warsaw, Poland.

PMID: 24328179 DOI: 10.1021/la403614z

Abstract

We have investigated the oxidation of ferrocene at a flowing organic solvent|aqueous electrolyte|solid electrode junction in a microfluidic setup using cyclic voltammetry and fluorescent laser scanning confocal microscopy. At low flow rates the oxidation current decreases with increasing flow, contrary to the Levich equation, but at higher flow rates the current increases linearly with the cube root of the flow rate. This behavior is explained using a simple model postulating a smallest effective width of the three-phase junction, which after fitting to the data comes to be ca. 20 μm. The fluorescence microscopy reveals mixing of the two phases close to the PDMS cover, but the liquid|liquid junction is stable close to the glass support. This study shows the importance of the solid|liquid|liquid junctions for the behavior of multiphase systems under microfluidic conditions.

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