Publications by authors named "G Monteil"
Article Synopsis
- The study examines how femtosecond lasers interact with tungsten carbide containing 10% cobalt, using a 1030 nm laser with a 400 fs pulse duration.
- Laser-induced periodic surface structures (LIPSS) were generated with low ablation rates at specific fluences, showing a spatial period of 665 nm and an amplitude of 225 nm, indicating effective surface modifications without significant thermal damage.
- Key parameters like the athermal ablation threshold fluence, incubation coefficient (0.79), and optical penetration depth (19 nm) were measured, providing insights into the material's response to laser processing.
Changes in net ecosystem exchange over Europe during the 2018 drought based on atmospheric observations.
Philos Trans R Soc Lond B Biol Sci
October 2020
The 2018 drought was one of the worst European droughts of the twenty-first century in terms of its severity, extent and duration. The effects of the drought could be seen in a reduction in harvest yields in parts of Europe, as well as an unprecedented browning of vegetation in summer. Here, we quantify the effect of the drought on net ecosystem exchange (NEE) using five independent regional atmospheric inversion frameworks.
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- * During this La Niña, tropical CH emissions increased by approximately 6-9 TgCH per year, primarily due to enhanced biogenic sources linked to expanded wetland areas from excessive rainfall.
- * The research indicates that while models predict an increase in wetland area during this period, they underestimate the emissions per unit area, suggesting a need for better modeling of wetland methane emissions.
Laser irradiation of a mixture of single-element micro/nanomaterials may lead to their alloying and fabrication of multi-element structures. In addition to the laser induced alloying of particulates in the form of micro/nanopowders in ambient atmosphere (which forms the basis of the field of additive manufacturing technology), another interesting problem is the laser-induced alloying of a mixture of single-element nanoparticles in liquids since this process may lead to the direct fabrication of alloyed-nanoparticle colloidal solutions. In this work, bare-surface ligand-free Ag and Pd nanoparticles in solution were prepared by laser ablation of the corresponding bulk target materials, separately in water.
View Article and Find Full Text PDFns or fs pulsed laser ablation of a bulk InSb target in liquids for nanoparticles synthesis.
J Colloid Interface Sci
May 2016
Laser ablation of bulk target materials in liquids has been established as an alternative method for the synthesis of nanoparticles colloidal solutions mainly due to the fact that the synthesized nanoparticles have bare, ligand-free surfaces since no chemical precursors are used for their synthesis. InSb is a narrow band gap semiconductor which has the highest carrier mobility of any known semiconductor and nanoparticles of this material are useful in optoelectronic device fabrication. In this paper a bulk InSb target was ablated in deionized (DI) water or ethanol using a nanosecond (20 ns) or a femtosecond (90 fs) pulsed laser source, for nanoparticles synthesis.
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