Publications by Dmitry Momotenko

Electrochemical push-pull probe: from scanning electrochemical microscopy (SECM) to multimodal altering of cell microenvironment

Hubert Girault, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch, Alexandra Bondarenko

To understand biological processes at the cellular level, a general approach is to alter the cells’ environment and to study their chemical responses. Herein, we present the implementation of an electrochemical push-pull probe, which combines a microfluidi ...

Amer Chemical Soc2015

Finger Probe Array for Topography-Tolerant Scanning Electrochemical Microscopy of Extended Samples

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

Scanning electrochemical microscopy with soft microelectrode array probes has recently been used to enable reactivity imaging of extended areas and to compensate sample corrugation perpendicular to the scanning direction. Here, the use of a new type of mic ...

Amer Chemical Soc2014

Kinetic differentiation of bulk/interfacial oxygen reduction mechanisms at/near liquid/liquid interfaces using scanning electrochemical microscopy

Hubert Girault, Fernando Cortes Salazar, Dmitry Momotenko, Haiqiang Deng, Thomas James Stockmann, Pekka Eero Peljo

The present work describes the application of scanning electrochemical microscopy (SECM) in the feedback mode to determine the kinetics of oxygen reduction at or near the liquid/liquid interface – between water and 1,2-dichloroethane (w/DCE). The system co ...

Elsevier2014

Gold Metal Liquid-Like Droplets

Pierre-François Marie Brevet, Hubert Girault, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Dmitry Momotenko, Micheal Diarmaid Scanlon, Evgeny Smirnov

Simple methods to self-assemble coatings and films encompassing nanoparticles are highly desirable in many practical scenarios, yet scarcely any examples of simple, robust approaches to coat macroscopic droplets with continuous, thick (multilayer), reflect ...

Amer Chemical Soc2014

Scanning Electrochemical Microscopy and Finite Element Modeling of Structural and Transport Properties of Electrochemical Systems

Dmitry Momotenko

Understanding the fundamental properties of electrochemical systems, especially at the microscopic level, requires advanced tools combining electrochemical microscopy and scanning probe techniques with mathematical modeling for the quantification of the ph ...

EPFL2013

A microchip emitter for solid phase extraction – gradient elution – mass spectrometry

Hubert Girault, Mohammad Reza Pourhaghighi, Liang Qiao, Dmitry Momotenko, Natalia Gasilova

A microchip electrospray emitter with a magnetic bead trap has been designed for solid phase extraction-gradient elution-mass spectrometry (SPE-GEMS). The goal of this method is the detection of analytes at low concentrations and it is here demonstrated us ...

American Chemical Society2013

Conductive Gold Nanoparticle Mirrors at Liquid/Liquid Interfaces

Hubert Girault, Frédéric Gumy, Carlos Manuel De Melo Pereira, Fernando Cortes Salazar, Véronique Amstutz, Dmitry Momotenko, Haiqiang Deng, Pingping Fang, Micheal Diarmaid Scanlon

Gold nanoparticle (Au NP) mirrors, that exhibit both high reflectance and electrical conductance, were self-assembled at a [heptane + 1,2-dichloroethane]/water liquid/liquid interface. The highest reflectance, as observed experimentally and confirmed by fi ...

Amer Chemical Soc2013

High-throughput scanning electrochemical microscopy brushing of strongly tilted and curved surfaces

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

The feasibility of high-throughput scanning electrochemical microscopy (SECM) of strongly tilted (tilt angles ≤4°) and curved substrates (diameter of curvature ≥9 cm) is demonstrated by brushing them with a soft linear array of carbon microelectrodes. This ...

Elsevier2013

Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

Hubert Girault, Patrick Voyame, Astrid Johana Olaya Avendano, Dmitry Momotenko, Kathryn Ellen Toghill

The electrochemical oxidation and reduction of decamethylferrocene is demonstrated in supercritical carbon dioxide at a macro gold disc electrode at 100 bar and 313 K. Fast mass transport effects were exhibited and the corresponding steady-state voltammetr ...

Royal Soc Chemistry2013

Differential capacitance of liquid/liquid interfaces of finite thicknesses: a finite element study

Hubert Girault, Carlos Manuel De Melo Pereira, Dmitry Momotenko

Finite element simulations were used to investigate the effect of a smooth variation of permittivity across a polarized liquid/liquid interface on the differential capacitance. The results show that a relative permittivity profile can account for the varia ...

Royal Soc Chemistry2012

Electrochemical Push–Pull Scanner with Mass Spectrometry Detection

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Liang Qiao, Dmitry Momotenko, Andreas Stephan Lesch

This manuscript presents a push-pull electrochem. scanner able to image reactivity of initially dry surfaces by scanning electrochem. microscopy (SECM) and to probe mols. present or generated at the surface by mass spectrometry (MS). The proof-of-concept i ...

Amer Chemical Soc2012

Segmented Field OFFGEL® Electrophoresis

Hubert Girault, Julien Maillard, Fernando Cortes Salazar, Dmitry Momotenko, Elena Tobolkina

A multielectrode setup for protein OFFGEL electrophoresis that significantly improves protein separation efficiency has been developed. Here, the electric field is applied by segments between seven electrodes connected in series to six independent power su ...

Wiley-Blackwell2012

Scan-Rate-Dependent Ion Current Rectification and Rectification Inversion in Charged Conical Nanopores

Hubert Girault, Dmitry Momotenko

Herein we report a theoretical study of diode-like behavior of negatively charged (e.g., glass or silica) nanopores at different potential scan rates (1-1000 V center dot s(-1)). Finite element simulations were used to determine current-voltage characteris ...

2011

Microfluidic Push-Pull Probe for Scanning Electrochemical Microscopy

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

This paper presents a microfluidic push-pull probe for scanning electrochemical microscopy (SECM) consisting of a working microelectrode, an integrated counter/reference electrode and two microchannels for pushing and pulling an electrolyte solution to and ...

2011

Ion current rectification and rectification inversion in conical nanopores: a perm-selective view

Hubert Girault, Fernando Cortes Salazar, Dmitry Momotenko

Ionic transport in charged conical nanopores is known to give rise to ion current rectification. The present study shows that the rectification direction can be inverted when using electrolyte solutions at very low ionic strengths. To elucidate these pheno ...

Royal Society of Chemistry2011

Seeing Big with Scanning Electrochemical Microscopy

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

Specialized microelectrode probes fabricated in a soft polymer film now make it possible to use scanning electrochemical microscopy to image the reactivity of large, corrugated, tilted, and dry surfaces. ...

American Chemical Society2011

Soft Microelectrode Linear Array for Scanning Electrochemical Microscopy

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

A linear array of eight individual addressable microelectrodes has been developed in order to perform highthroughput scanning electrochemical microscopy (SECM) imaging of large sample areas in contact regime. Similar to previous reports, the soft microelec ...

American Chemical Society2010

Fountain pen for scanning electrochemical microscopy

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

A fountain pen probe has been developed to extend the scope of scanning electrochemical microscopy (SECM) experiments to dry surfaces. The fountain pen is fabricated by UV-photoablation of a polyethylene terephthalate (PET) film and consists on one side of ...

Royal Society of Chemistry2010