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Hubert Girault

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Related publications (430)

Magnetic track array for efficient bead capture in microchannels

Hubert Girault, Anne-Laure Gassner, Mélanie Abonnenc

Magnetism-based microsystems, as those dedicated to immunoaffinity separations or (bio)chemical reactions, take benefit of the large surface area-to-volume ratio provided by the immobilized magnetic beads, thus increasing the sensitivity of the analysis. A ...

Springer Verlag2009

Hydrogen Evolution at Liquid–Liquid Interfaces

Hubert Girault, Bin Su, Raheleh Partovi Nia, Xile Hu, Imren Hatay, Heron Vrubel

Blowing bubbles: Hydrogen evolution by proton reduction with [(C5Me5)2Fe] occurs at a soft interface between water and 1,2-dichloroethane (DCE). The reaction proceeds by proton transfer assisted by [(C5Me5)2Fe] across the water–DCE interface with subsequen ...

Wiley-VCH Verlag GmbH2009

Soft Stylus Probes for Scanning Electrochemical Microscopy

Hubert Girault, Anne-Laure Gassner, Mohamad Hojeij, Gunther Wittstock, Fernando Cortes Salazar

A soft stylus microelectrode probe has been developed to carry out scanning electrochemical microscopy (SECM) of rough, tilted, and large substrates in contact mode. It is fabricated by first ablating a microchannel in a polyethylene terephthalate thin fil ...

2009

Photocatalytic Redox Reactions for In-Source Peptide Fragmentation

Hubert Girault, Hongyan Bi, Jérôme Waser, Liang Qiao

In-source photocatalytic redox reactions based on a photosensitive target plate have been developed to realize peptide fragmentation during laser desorption ionization. Sample peptides and glucose are simply deposited on a spot of sintered TiO2 nanoparticl ...

2009

Proton-Coupled Oxygen Reduction at Liquid-Liquid Interfaces Catalyzed by Cobalt Porphine

Hubert Girault, Zdenek Samec, Manuel Alejandro Méndez Agudelo, Imren Hatay, Fengping Li

Cobalt porphine (CoP) dissolved in the organic phase of a biphasic system is used to catalyze O2 reduction by an electron donor, ferrocene (Fc). Using voltammetry at the interface between two immiscible electrolyte solutions (ITIES), it is possible to driv ...

2009

Kinetics of Proteolytic Reactions in Nanoporous Materials

Hubert Girault, Hongyan Bi, Liang Qiao

Proteolysis with proteases preloaded within nanopores of porous material is a very fast process, where proteins can be digested in minutes compared to the conventional bulk enzyme reactions taking place over hours. To model this surprising phenomenon, a mo ...

American Chemical Society2009

Sandwich mixer–reactor: influence of the diffusion coefficient and flow rate ratios

Hubert Girault, Mélanie Abonnenc

A sandwich mixer consists of mixing two solutions in a channel, one central laminar flow being sandwiched between two outer flow solutions. The present numerical study considers the convection– diffusion of two reacting species A and B, provided respective ...

2009

SECM for imaging and detection of latent fingerprints

Hubert Girault

Fingerprint analysis is one of the most important methods used for personal identification of evidence found at a crime scene for forensic purposes. Using scanning electrochemical microscopy (SECM) imaging, researchers can visualize the ultrastructure of h ...

2009

Iontophoretic Fraction Collection for Coupling Capillary Zone Electrophoresis with Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry

Hubert Girault, Niels Erik Lion

An automated fraction collection interface has been developed for coupling capillary electrophoresis (CE) with matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS). This fraction collection approach is based on electromigration and diff ...

2009

Amperometric tape ion sensors for cadmium(II) ion analysis

Hubert Girault, Carlos Manuel De Melo Pereira

This paper describes a novel tape platform ion sensing methodology specific to the detection of cadmium(II) ions in aqueous solution based on assisted ion transfer reactions across a polarized water | organic gel micro-interface. The tape ion sensors were ...

2009

About the Electrospray Ionization Source in Mass Spectrometry: Electrochemistry and On-chip Reactions

Hubert Girault, Joël Stéphane Rossier, Michel Prudent, Niels Erik Lion, Christophe Roussel, Bin Su, Manuel Alejandro Méndez Agudelo

The present work shows that the electrochemical properties of electrospray ionization (ESI) can be used to add functions to the process. As example, we show how the choice of the electrode material can be used to study interactions between metal ions and b ...

2009

Detection of hydrogen peroxide produced at a liquid/liquid interface using scanning electrochemical microscopy

Hubert Girault, Bin Su, Raheleh Partovi Nia, Fernando Cortes Salazar

Scanning electrochemical microscopy (SECM) was used to monitor in situ hydrogen peroxide (H2O2) produced at a polarized water/1,2-dichloroethane (DCE) interface. The water/DCE interface was formed between a DCE droplet containing decamethylferrocene (DMFc) ...

Elsevier2009

Human fingerprint imaging by scanning electro-chemical microscopy

Hubert Girault, Michel Prudent, Fernando Cortes Salazar, Christophe Champod

Schweizerische Chemische Gesellschaft2009

Proton Pump for O2 Reduction Catalyzed by 5,10,15,20- Tetraphenylporphyrinatocobalt(II)

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Fengping Li

The role of 5,10,15,20-tetraphenylporphyrinatocobalt(II) ([Co-(tpp)]) as a catalyst on molecular oxygen (O2) reduction by ferrocene (Fc) and its two derivatives, 1,1’-di-methylferrocene (DFc) and decamethylferrocene (DMFc) at a polarized water¦1,2-dichloro ...

2009

Magnetic forces produced by rectangular permanent magnets in static microsystems

Hubert Girault, Joël Stéphane Rossier, Anne-Laure Gassner, Mélanie Abonnenc, Hong-Xu Chen

Finite element numerical simulations were carried out in 2D geometries to map the magnetic field and force distribution produced by rectangular permanent magnets as a function of their size and position with respect to a microchannel. A single magnet, two ...

2009

TiO2 Printed Aluminum Foil: Single-Use Film for a Laser Desorption/Ionization Target Plate

Valérie Devaud, Hubert Girault, Hongyan Bi, Liang Qiao

Single-use aluminum foil-based laser desorption/ionization (LDI) target plates have been developed for mass spectrometry (MS) analysis and provide detection results comparable to those of commercial stainless steel plates while offering a convenient way to ...

2009

Electrospray Micromixer Chip for On-Line Derivatization and Kinetic Studies

Hubert Girault, Niels Erik Lion, Loïc Dayon, Brice Perruche, Mélanie Abonnenc

An electrospray microchip for mass spectrometry comprising an integrated passive mixer to carry out on-chip chemical derivatizations is described. The microchip fabricated using UV-photoablation is composed of two microchannels linked together by a liquid ...

2008

Evidence of tetraphenylporphyrin monoacids by ion-transfer voltammetry at polarized liquid|liquid interfaces

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia

We present a simple methodology to illustrate the existence of tetraphenylporphyrin monoacid based on ion-transfer voltammetry at a polarized water|1,2-dichloroethane interface and organic pK values are also estimated. ...

Royal Society of Chemistry2008

Nanoporous Photocathode and Photoanode Made by Multilayer Assembly of Quantum Dots

Hubert Girault, Bin Su, Mohamad Hojeij

We perform in this paper a kinetic study of the photoelectrochemical responses of nanoporous thin photoactive films. The films were fabricated by by a layer-by-layer assembly of positively charged polyelectrolytes (poly-L- Lysine, pLys) and negatively char ...

American Chemical Society2008

Magnetic Beads Based Immunoaffinity Capillary Electrophoresis of Total Serum IgE with Laser-Induced Fluorescence Detection

Hubert Girault, Hong-Xu Chen, Xi Zhang

A magnetic beads based immunoaffinity capillary electrophoresis method for total Immunoglobulin E quantification in serum has been developed. The method combines speed, automation ability, and minimal sample consumption. Only 1 μL of serum is required whil ...

2008

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