Team 14: Charge transfer processes in hydrodynamic systems

Team 14: Charge transfer processes in hydrodynamic systems.
Leader: Dr Martin Jönsson-Niedziółka
The research group has two main branches; studies of ion transfer between immiscible liquids in microfluidic systems; and studies bioelectrocatalytic processes by enzymes both under static and hydrodynamic
conditions. Experiments are complemented with computer simulations, mainly using Comsol.
Ion transfer studies in microfluidics is a relatively new topic that complements the traditional studies usually
performed in droplet based systems. We have investigated the anomalous dependence of ion transfer current
as a function of flow rate and recently shown that the equations for ion transfer at three phase electrodes in
static system also can be used in microfluidics. Ongoing studies involves work with more complex redox
probes, such as fullerene C60, but also electrochemical processes in droplet-based microfluidic systems.
The study of enzyme reactions are performed both with an eye towards applications in sensing and biofuel
cells as well as for fundamental studies of enzyme kinetics. We perform measurements using both rotating
disk electrodes (RDE) as well as in microfluidic systems. Both of these systems are forced convective
systems; although microfluidics offers a larger array of possible electrode materials and easier modification,
RDE is more user friendly. We are also working on developing new materials for electrode modification that
ensures proper immobilisation and electron transfer between the enzyme and the electrode.
Group members
Dr inż Wojciech Adamiak
Mgr inż Dawid Kałuża
Mgr inż Marcin S Filipiak
Ms Magdalena Kundys
Most important recent publications:
A. Zloczewska, A. Celebanska, K. Szot; D. Tomaszewska, M. Opallo, M. Jönsson-Niedziółka
Self-Powered Biosensor for Ascorbic Acid with a Prussian Blue Electrochromic Display, Biosens. Bioelectron. 54, 455–
461 (2014) (link) (free preprint)
D. Kaluza, W. Adamiak, T. Kalwarczyk, K. Sozanski, M. Opallo, M. Jönsson-Niedziółka
The anomalous effect of flow rate on the electrochemical behavior at a liquid|liquid interface under microfluidic
conditions, Langmuir 29, 16034–16039 (2013) (link)
J. Urban, A. Zloczewska, W. Stryczniewicz, M. Jönsson-Niedziolka
Enzymatic oxygen reduction under quiescent conditions - the importance of convection, Electrochem Commun. 34, 94-97
(2013). (link) (free preprint)