Application of LIBS to the detection of nano-objects, their aggregates and their agglomerates

Abstract : Nanostructured materials are expected to lead to the emergence of new products with enhanced features and functionalities. Their manufacturing often requires the use of nanostructured particles with different sizes, shapes and chemical compositions referred to as NOAA (Nano Objects, their Aggregates and their Agglomerates). These are the basic building blocks used to design nanostructured materials. The advent of these new objects raises the question of the development of an adapted metrology for their characterization in various contexts. Two examples of need may be underlined. First, little is known yet as to the risks related to nano objects in terms of impact on human health and the environment. There is therefore a need to detect and characterize these particles for instance in the workplace. Second, production processes require tools for on line characterization of the final product. Thus, adapted instruments allowing, on site, on line and even in real time the determination of the mass concentrations of all the elements the particles are made of must be designed to meet the aforementioned needs. LIBS was deemed as a potential candidate for the detection of NOAA in the aforementioned contexts at INERIS. It was applied to the detection of carbon nanotube balls while these were being handled by an operator. A spectral signature was isolated, thus demonstrating the potentialities of LIBS at workplace. Composite particle stoichiometry may be determined even without calibration by comparing experimental and synthetic spectra, thereby illustrating the potentialities of this technique for process control, for example when synthesizing SiCx nanoparticles with a laser pyrolysis reactor. As particle release in waters is likely to become a major issue in the near future, detection of particles in liquids was broached as well. Two sampling techniques, the liquid jet and aerosolization were compared. Detection limit of aerosol measurement by LIBS may be enhanced by improving sampling. Two sampling methods may be envisaged in addition to that currently employed and consisting in igniting a plasma on the particle flow. The first approach rests in trapping the particles in levitation within a radio frequency plasma discharge. The second approach aims at triggering the laser shots only when a particle is in the vicinity of the focal volume. All studies carried out at INERIS aim at developing field operational LIBS systems applied either to industrial or environmental issues. They will be presented and discussed.of LIBS to the Detection of Nano-objects, Their Aggregates and Their Agglomerates
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Conference papers
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Christophe Dutouquet. Application of LIBS to the detection of nano-objects, their aggregates and their agglomerates. 8. International Conference on Laser Induced Breakdown Spectroscopy (LIBS 2014), Sep 2014, Beijing, China. ⟨ineris-01852887⟩

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