Alexandre Felten

Elucidating the composition and formation mechanism of slippery films from block copolymers on doped diamond-like carbon surfaces

Takeru Omiya, Enrico Pedretti, A. Cavaleiro, R. Gouttebaron et autres

Silicon-doped diamond-like carbon (Si-DLC) coatings combined with nitrogen-containing block copolymers offer a promising avenue for advanced boundary lubrication. In this study, we investigate the tribological behavior of Si-DLC in the presence of poly(lauryl methacrylate)-block-poly(2-dimethylaminoethyl methacrylate) (PLMA- b -PDMAEMA) to elucidate the formation …

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Polymetallic interactions of Zn-Pb-Cu in blue/green-colored speleothems from Malaval Cave (France)

Martin Vlieghe, Gäetan Rochez, Stéphane Pire-Stevenne, Alexandre Felten et autres

Speleothems rarely exhibit stunning colors such as red, yellow, green, or blue. The colorations are often linked to elevated heavy metal ion concentration in the drip water and thus to a metal source/pollution in the catchment area. Here the blue-green speleothems coloration …

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Malaval Cave Pb-Zn-Cu interactions and blue colorations

Martin Vlieghe, G Rochez, Stéphane Pire-Stevenne, Alexandre Felten et autres

editorial reviewed

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Sustainable lubrication through Gd DLC films and ionic liquids for wear and corrosion resistance

Takeru Omiya, A. Cavaleiro, N.M. Figueiredo, R. Gouttebaron et autres

This study examines the integration of ionic liquids (ILs) with gadolinium diamond-like carbon (Gd-DLC) films as a means of addressing the environmental drawbacks associated with conventional additives, such as zinc dialkyldithiophosphates. Tribological testing initially revealed that higher concentrations of gadolinium in the …

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Pyrite oxidation rates and timing of weathering in supergene deposits: new insights from XPS approach

Julien Poot, Alexandre Felten, Julien L. Colaux, R. Gouttebaron et autres

Pyrite is one of the most common sulfides on Earth and occurs in many Cu, Pb and Zn sulfides (hypogene) ore deposits. By using XPS (X-ray Photoelectron Spectroscopy) surface and depth analyses, we propose a new experimental approach to determine the oxidation …

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Experimental timing of pyrite oxidation under various leaching conditions: consequences for rates of weathering in geological profiles

Julien Poot, Alexandre Felten, Julien L. Colaux, R. Gouttebaron et autres

Abstract Pyrite (FeS2) is one of the most abundant sulfides on Earth and has already been studied in numerous ways for decades because of its rapid oxidation and the associated environmental impacts. This study proposes a new experimental physico-chemical approach (air, tridistilled …

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Secondary ion mass spectrometry, a powerful tool for revealing ink formulations and animal skins in medieval manuscripts

David Gravis, Nicolas Roy, Nicolas Ruffini-Ronzani, Laurent Houssiau et autres

Book production by medieval scriptoria have gained growing interest in recent studies. In this context, identifying ink compositions and parchment animal species from illuminated manuscripts is of great importance. Here, we introduce time-of-flight secondary ion mass spectrometry (ToF-SIMS) as a non-invasive tool …

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Fused deposition modeling 3D printing of solid oral dosage forms containing amorphous solid dispersions: How to elucidate drug dissolution mechanisms through surface spectral analysis techniques?

Chloé Parulski, Eva Gresse, Olivier Jennotte, Alexandre Felten et autres

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Synthesis of 2D anatase TiO 2 with highly reactive facets by fluorine-free topochemical conversion of 1T-TiS 2 nanosheets

Marco Zarattini, Chaochao Dun, Liam H. Isherwood, Alexandre Felten et autres

Highly crystalline anatase TiO 2 nanosheets, made by controlled oxidation of TiS 2 nanosheets, expose the {001} and {100} facets, giving rise to enhancement in HER as compared to Degussa P25 TiO 2 nanoparticles. No enhancement in ORR was observed.

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Low-impact synthesis of mesostructured acidic catalysts: toward the efficient conversion of crude glycerol

Amélie Maertens, Alvise Vivian, Luca Fusaro, Alexandre Felten et autres

A series of Ga-based porous nanospheres with highly controllable particle size was prepared via a rapid and sustainable synthetic procedure. They were efficiently used as catalysts in the valorization of glycerol under simulated raw conditions.

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Study of surface oxidation and recovery of clean MoTe 2 films

Trung T. Pham, Roshan Castelino, Alexandre Felten, R. Sporken

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Unravel the rate of pyrite oxidation under weathering conditions:an experimental approach

Julien Poot, Alexandre Felten, Guillaume Lepêcheur, Julien L. Colaux et autres

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