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The University of Southampton

Electrochemical nanofluidics: mesoscopic and single-molecule limits Seminar

21 November 2013
29/2075 Chemistry Highfield University of Southampton SO17 1BJ

For more information regarding this seminar, please email Dr Andrew Hector at .

Event details

An electrochemistry seminar

Prof Serge Lemay, University of Twente

Electrochemical nanofluidics: mesoscopic and single-molecule limits

Lithography-based microfabrication allows creating fluidic devices with well-defined dimensions below 100 nm. We have employed this capability to create nanoscale thin-layer cells and interfacing them to microfluidic channels, thus simultaneously allowing highly efficient redox cycling and independent control of advective mass transport. The electrochemical response of the devices is characterized by stochastic fluctuations associated with the random nature of Brownian motion. Analysis of these fluctuations permits extracting information which is otherwise mostly inaccessible, as illustrated by our use of number fluctuations to measure record-low flow rates of order 1 pL/min as well as in-situ potential-dependent adsorption of redox species. The high degree of amplification finally allows detecting single redox-active molecules and quantitatively studying their individual Brownian trajectories.

Speaker information

Prof Serge Lemay, University of Twente. Serge G. Lemay was born in Rimouski, Canada, in 1970. He received a B.A.Sc. in Electrical Engineering with minor in Physics from the University of Waterloo in 1993, and a Ph.D. in Physics from Cornell University in 1999, where he studied electronic transport in quasi-one-dimensional metals. He was a member of the Kavli Institute of Nanoscience at Delft University of Technology in The Netherlands from 1999 to 2009, first as a postdoc in the Quantum Transport section and later as faculty member in Molecular Biophysics. In 2009 he founded the Nanoionics group at the MESA+ Institute for Nanotechnology, University of Twente. His main research interests at present include electrostatics in liquids, the fundamentals of electroosmosis, and electrochemical nanofluidics.

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