UFR de Physique

Propositions de stages en laboratoire -- M2

Les offres sont actualisées en mai. Par exemple, les offres de stages pour l'année universitaire 2015-2016 seront mises en place en mai 2015, les offres de stages pour l'année universitaire 2016-2017 seront mises en place pour en mai 2016, etc.

Identification of oxygen-containing compounds on the surface of soot particles by two-step laser mass spectrometry (L2MS)

  • Option International « Atmospheric Environnement » du parcours Lumière-Matière
  • Laboratoire: Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM)
  • Responsable du stage: CARPENTIER Yvain (yvain.carpentier@univ-lille.fr,
  • Co-responsable(s): FOCSA Cristian, THERSSEN Eric
  • Mots clés: second-generation biofuel, mass spectrometry, laser ionization
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The use of biofuels alternative to diesel, gasoline or kerosene is a major current strategic challenge that must minimize the emission of transport-related greenhouse pollutants. Recent studies have shown that oxygenated biofuels produce lower amounts of soot than conventional petroleum fuels. However, their use is likely to modify the physicochemical properties of the emitted soot particles and thus influence their toxicity to humans or their harmfulness to the environment. For these reasons, it is essential to have experimental techniques allowing the analysis of the chemical species present at trace level on the surface of these particles. As part of a collaboration between the PhLAM and PC2A laboratories, the particles produced in a flame fed by various second-generation oxygenated biofuels will be probed, transferred without contact with the atmosphere onto a substrate and analyzed by two-step laser mass spectrometry (L2MS). Resonant two-color two-photon ionization (R2C2PI) in the UV will be set up during the internship to successfully detect oxygenated target species selectively and with great sensitivity. Tests will be carried out initially on synthetic soot composed of black carbon on which is deposited a mixture of molecules in well-defined surface concentrations. The surface chemical composition of the soot particles for the different biofuels tested will be compared with that obtained for conventional fuels. The application of the new ionization scheme will also be extended to the analysis of samples collected at engine exhaust or field samples in the framework of various projects.