Application du laser à la caractérisation des nanoparticules dans l‘air

Abstract : If pollution by gaseous compounds is nowadays evaluated more and more accurately, that relating to particles remains difficult to quantify in a precise manner because their characteristic parameters are much more complex than those of gaseous pollutants. Indeed, monitoring of temporal evolution of the mass concentration in the ambient air or in the workplace proves to be an insufficient tool to predict the environmental or toxic impact. Thus, nanoparticle leak detection in the workplace cannot be addressed using instrumentation based on mass concentration metric. Thus, in the framework of the European Nanosafe 2 project, we have developed new methodologies in order to characterise or detect manufactured nanoparticles. This instrumentation was able to produce on-line size resolved chemical identification of nanoparticles in air, where physical characterisation was obtained using electrical mobility analysis (DMA) and chemical identification was obtained using laser induced plasma spectroscopy (LIBS or LIPS). Performance analyses have shown a detection limit of several μg.m-3 for 40nm nanoparticles associated with really good reproducibility and without humidity dependency. Moreover, the Laser Induced Breakdown Spectroscopy (LIBS) technique was also evaluated as a quality process monitoring tool. LIBS was employed for on-line and real time process monitoring during nanoparticle production by laser pyrolysis, where on-line and real time monitoring systems could greatly enhance the process optimisation and accordingly improve its performance. For this purpose, experiments aiming at demonstrating the feasibility of an on-line monitoring system for silicon carbide nanoparticle production using the LIBS technique were carried out. Nanosecond laser pulses were focused into a cell through which part of the nanoparticle flux diverted from the production process was flowed for LIBS analysis purposes. The nanoparticles were vaporised within the laser induced plasma created in argon used as background gas in the process. Temporally resolved emission spectroscopy measurements were performed in order to control nanoparticle stoichiometry. Finally, promising results were obtained and on-line Si/CX stoichiometry was successfully observed.
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Emeric Frejafon, Olivier Le Bihan, Tanguy Amodeo, Christophe Dutouquet. Application du laser à la caractérisation des nanoparticules dans l‘air. Rapport Scientifique INERIS, 2007, 2006-2007, pp.49-51. ⟨ineris-01869087⟩

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