Publications by Mohamad Hojeij

Photo-recycling the Sacrificial Electron Donor: Towards Sustainable Hydrogen Evolution in a Biphasic System

Hubert Girault, Mohamad Hojeij, Peiyu Ge

H-2 may be evolved biphasically using a polarised liquid|liquid interface, acting as a "proton pump", in combination with organic soluble metallocenes as electron donors. Sustainable H-2 production requires methodologies to recycle the oxidised donor. Here ...

WILEY-V C H VERLAG GMBH2020

Antioxidant Assay Based on Quenching of Photocatalytically Generated Reactive Oxygen Species

Hubert Girault, Mohamad Hojeij, Qifeng Zhang

A method based on photogeneration of OH radicals in water from TiO2 nanoparticles was developed to study the kinetics of oxidation of organic molecules which were used as biological antioxidants. The kinetics of oxidation of terephthalic acid as a referenc ...

Elsevier Science Inc2016

Photocurrents at polarized liquid|liquid interfaces enhanced by a gold nanoparticle film

Hubert Girault, Nathalie Younan, Mohamad Hojeij

Photocurrent responses associated with the interfacial quenching of the photo-excited water-soluble zinc meso-tetra(4-carboxyphenyl)porphyrin (ZnTPPC) by ferrocene have been studied at a water|1,2-dichloroethane interface in the absence and in the presence ...

Royal Society of Chemistry2011

Influence of sample processing parameters on thermal boundary conductance value in an Al/AlN system

Ludger Weber, Christian Monachon, Mohamad Hojeij

The influence of sample processing parameters on the thermal boundary conductance (TBC) between aluminum and aluminum nitride has been investigated by transient thermoreflectance. An evaporated Al layer on the polished substrate yielded a TBC at ambient of ...

American Institute of Physics2011

Controlling the specific enrichment of multi-phosphorylated peptides on oxide materials: aluminium foil as a target plate for laser desorption ionization mass spectrometry

Hubert Girault, Mohamad Hojeij, Hongyan Bi, Manuel Alejandro Méndez Agudelo, Liang Qiao

A specific multi-phosphopeptide enrichment method is presented to complement current phosphopeptide isolation strategies that normally bias mass spectrometry analysis towards the detection of mono-phosphopeptides. An adsorption model is developed that show ...

2010

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

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

Photoelectrochemical properties of sensitized thin films

Mohamad Hojeij

In recent years, the fabrication of novel ultrathin film systems featuring multi-functionalities has been extensively studied due to their potential applications in photonics, sensors and solar cells. In a general sense, the primary goal of the present the ...

EPFL2009

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

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

Self-assembly of polypeptide/pi-conjugated polymer/polypeptide triblock copolymers in rod-rod-rod and coll-rod-coil conformations

Raffaele Mezzenga, Mohamad Hojeij

Self-assembly in the bulk of a series of hybrid triblock copolymers formed by a poly(9,9-dihexylfluorene-2,7-diyl) (PHF) middle block and two poly(gamma-benzyl-L-glutamate) (PBLG) end blocks has been studied. Since the alpha-helical secondary structure of ...

American Chemical Society2008

H2O2 generation by decamethylferrocene at a liquid | liquid interface

Hubert Girault, Michel Prudent, Zdenek Samec, Bin Su, Mohamad Hojeij, Raheleh Partovi Nia, Anne-Clémence Corminboeuf

Hydrogen peroxide generation at a liquid|liquid interface occurs with a yield of 20 % with respect to the concentration of reducing agent (decamethylferrocene). The liquid|liquid interface supplies electrons from the reducing agent and protons from the aqu ...

Wiley-VCH Verlag GmbH2008

Nanoporous photocathode and photoanode for light energy conversion

Hubert Girault, Bin Su, Mohamad Hojeij

2008

Porphyrin ‘‘Mille-Feuilles” photo-electrodes

Hubert Girault, Bin Su, Mohamad Hojeij

A porphyrin ‘‘Mille-Feuilles” photo-electrode is fabricated layer-by-layer by deposition of anionic [zinc meso-tetrakis(p-sulfonato phenyl) porphyrin]4- (ZnTPPS4−) and positively charged polypeptides on a 11-mercaptoundecanoic acid-modified gold electrode ...

2008

SECM photography

Hubert Girault, Bin Su, Mohamad Hojeij, Fernando Cortes Salazar

A novel strategy for imaging commercial black-and-white negative photo films by scanning electrochemical microscopy (SECM) is demonstrated. The imaging is based on using IrCl3 6 as the redox mediator to dissolve silver grains. The SECM probe is biased at a ...

Elsevier2008

3D-ITIES supported on porous reticulated vitreous carbon

Hubert Girault, Nicolas Eugster, Bin Su, Mohamad Hojeij

A thin aqueous film prepared by layer-by-layer assembly of oppositely charged polypeptides on 4-aminobenzoic acid modified porous reticulated vitreous carbon (RVC) electrodes was used with the aim of forming a 3D-ITIES. The film containing a redox mediator ...

2007

CdSe Sensitized Thin Aqueous Films: Probing the Potential Distribution Inside Multilayer Assemblies

Hubert Girault, Nicolas Eugster, Bin Su, Mohamad Hojeij

Ultrathin polypeptide multilayer films are assembled by the sequential electrostatic adsorption of monolayers of poly-L-lysine and poly-L-glutamic acid onto carboxylic acid terminated alkanethiol-modified gold surfaces. The polypeptide multilayer films are ...

American Chemical Society2006