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Hubert Girault

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Related publications (430)

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

Molecular Electrocatalysis for Oxygen Reduction by Cobalt Porphyrins Adsorbed at Liquid/Liquid Interfaces

Hubert Girault, Zdenek Samec, Pierre-Alain Carrupt, Bin Su, Imren Hatay

Molecular electrocatalysis for oxygen reduction at a polarized water/1,2-dichloroethane (DCE) interface was studied, involving aqueous protons, ferrocene (Fc) in DCE and amphiphilic cobalt porphyrin catalysts adsorbed at the interface. The catalyst, (2,8,1 ...

2010

Oxygen reduction by decamethylferrocene at liquid/liquid interfaces catalyzed by dodecylaniline

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Manuel Alejandro Méndez Agudelo, Imren Hatay

Molecular oxygen (O2) reduction by decamethylferrocene (DMFc) was investigated at a polarized water/ 1,2-dichloroethane (DCE) interface. Electrochemical results point to a mechanism similar to the EC type reaction at the conventional electrode/solution int ...

Elsevier2010

Surface plasmon resonance of gold nanoparticles assemblies at liquid | liquid interfaces

Hubert Girault, Nathalie Younan, Mohamad Hojeij, Lydie Ribeaucourt

Surface plasmon resonance (SPR) was observed when a planar close-packed assembly of gold nanoparticles (Au NPs) is adsorbed at the water|1,2-dichloroethane interface. Aqueous gold nanoparticles, 13 or 16 nm in diameter, are deposited at the interface by ad ...

2010

Formation and study of single metal ion–phospholipid complexes in biphasic electrospray ionization mass spectrometry

Hubert Girault, Michel Prudent, Anne-Clémence Corminboeuf, Manuel Alejandro Méndez Agudelo, Daniel Filipe Dos Santos Alves Jana

Single metal ion-phospholipid complexes are observed in biphasic electrospray ionization mass spectrometry (BESI-MS) using a dual-channel microsprayer. Such a microsprayer makes it possible to put into contact two immiscible liquids within the Taylor cone. ...

Royal Society of Chemistry2010

Molecular electrocatalysis at soft interfaces

Hubert Girault

The fundamental aspects of electrochemistry at liquid–liquid interfaces are introduced to present the concept of molecular electrocatalysis. Here, a molecular catalyst is adsorbed at the interface to promote a proton coupled electron transfer reaction such ...

Royal Society of Chemistry2010

Electrochemical Aspects of Electrospray and Laser Desorption/Ionization for Mass Spectrometry

Hubert Girault, Mélanie Abonnenc, Liang Qiao

Soft-ionization methods, namely electrospray ionization and laser desorption/ionization, are widely used to transfer large molecules as intact gas-phase ions either from a solution or from a solid substrate. During both processes, in-source electrochemical ...

2010

Nanomaterial-assisted laser desorption ionization for mass spectrometry-based biomedical analysis

Hubert Girault, Liang Qiao

Nanomaterials have been widely used to assist laser desorption ionization of biomolecules for mass spectrometry analysis. Compared with classical matrix-assisted laser desorption ionization, strategies based on nanomaterial-assisted ionization generate a c ...

2010

Voltammetric determination of extreme standard Gibbs ion transfer energy

Hubert Girault, Fernando Cortes Salazar, Manuel Alejandro Méndez Agudelo, Astrid Johana Olaya Avendano

A voltammetric methodology to determine the standard Gibbs energy of transfer of highly hydrophobic and hydrophilic ions has been developed. The electrochemical cell used includes a water|1,2-dichloroethane micro-interface supported on a microhole in a thi ...

Elsevier2010

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

Dioxygen Reduction by Cobalt(II) Octaethylporphyrin at Liquid / Liquid Interfaces

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Manuel Alejandro Méndez Agudelo

Oxygen reduction catalyzed by cobalt(II) (2,3,7,8,12,13,17,18-octaethylporphyrin) [Co(OEP)] at soft interfaces is studied by voltammetry and biphasic reactions. When Co(OEP) is present in a solution of 1,2-dichloroethane in contact with an aqueous acidic s ...

Wiley-Blackwell2010

Oxygen reduction catalyzed by a fluorinated tetraphenylporphyrin free base at liquid/liquid interfaces

Hubert Girault, Zdenek Samec, Bin Su, Anne-Clémence Corminboeuf, Manuel Alejandro Méndez Agudelo, Imren Hatay

The diprotonated form of a fluorinated free base porphyrin, namely 5-(p-aminophenyl)-10,15,20-tris(pentafluorophenyl)porphyrin (H(2)FAP), can catalyze the reduction of oxygen by a weak electron donor, namely ferrocene (Fc). At a water/1,2-dichloroethane in ...

American Chemical Society2010

Oxygen and proton reduction by decamethylferrocene in non-aqueous acidic media

Hubert Girault, Zdenek Samec, Bin Su, Anne-Clémence Corminboeuf, Manuel Alejandro Méndez Agudelo, Imren Hatay, Peiyu Ge

Experimental studies and density functional theory (DFT) computations suggest that oxygen and proton reduction by decamethylferrocene (DMFc) in 1,2-dichloroethane involves protonated DMFc, DMFcH+, as an active intermediate species, producing hydrogen perox ...

Royal Society of Chemistry2010

Electrochemical properties of gold nanoparticles assembly at polarised liquid|liquid interfaces

Hubert Girault, Nathalie Younan, Mohamad Hojeij, Lydie Ribeaucourt

Capacitance measurements of a polarised liquid|liquid interface show that the capacitance of the interface increases in the presence of an adsorbed monolayer of citrate-coated gold nanoparticles. This unusual observation can be explained by an increase of ...

Elsevier2010

Polycarbonate microchannel network with carpet of Gold NanoWires as SERS-active device

Hubert Girault, Aurore Rudolf

A polycarbonate (PC) microchannel network supporting gold nanowires was developed to be a SERSactive microchip. Observations of large increases in a Raman cross-section, allowed us to collect vibrational signatures which are not easily detectable by Raman ...

Royal Society of Chemistry2009

Adsorbed protein detection by scanning electrochemical microscopy

Hubert Girault, Fernando Cortes Salazar

A scanning electrochemical microscopy (SECM) protein detection methodology has been developed based on the tagging of free cysteines and other nucleophiles in proteins and peptides by benzoquinone. The tagged proteins are detected by the mediated reduction ...

2009

Functional Electrospray Emitters

Hubert Girault, Michel Prudent

Electrospray ionisation (ESI) is a soft technique used in mass spectrometry (MS) analysis able to introduce a wide variety of analytes in the gas phase. Briefly, it consists in the application of a high- voltage to a solution to spray it through a small or ...

2009

Plate for matrix-assisted laser desorption ionization mass spectrometry, comprises electroconductive substrate covered with sintered nanoparticles, deposited as array of spots, for supporting ionization of sorbed sample molecules

Hubert Girault, Michel Prudent, Niels Erik Lion, Christophe Roussel, Jingjing Wan, Liang Qiao

NOVELTY - A plate comprises an electroconductive substrate (1) at least partially covered with sintered nanoparticles (2), deposited as an array of individual spots, for use as a sorbing phase for a sample, and for supporting ionization of sorbed sample mo ...

2009

Voltammetry for surface-active ions at polarisable liquid|liquid interfaces

Hubert Girault, Bin Su, Manuel Alejandro Méndez Agudelo

Adsorption of charged species at the interface between two immiscible electrolyte solutions (ITIES) is simulated taking into account both the mutual influence between the potential dependent surface excess charge and the potential distribution between the ...

2009

The role of copper in cysteine oxidation: study of intra- and inter-molecular reactions in mass spectrometry

Hubert Girault, Michel Prudent

Cysteine-containing peptide oxidation was studied both by using an inert platinum electrode and a sacrificial electrode (copper or zinc) generating metallic ions in electrospray ionization mass spectrometry (ESI-MS). Using peptides containing one, two and ...

Royal Society of Chemistry2009

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