A5090205811- Advanced Combustion Engine Technologies
- Atmospheric chemistry and aerosols
- Catalytic Processes in Materials Science
- Vehicle emissions and performance
- Combustion and flame dynamics
- Toxic Organic Pollutants Impact
- Air Quality and Health Impacts
- nanoparticles nucleation surface interactions
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Chemical Thermodynamics and Molecular Structure
- Atmospheric aerosols and clouds
- Laser-induced spectroscopy and plasma
- Advanced Aircraft Design and Technologies
- Ion-surface interactions and analysis
- Pharmacological Effects and Assays
- Atmospheric Ozone and Climate
- Heat transfer and supercritical fluids
- Air Quality Monitoring and Forecasting
- Petroleum Processing and Analysis
- Maritime Transport Emissions and Efficiency
- Coagulation and Flocculation Studies
- Gas Sensing Nanomaterials and Sensors
- Calibration and Measurement Techniques
- Particle Dynamics in Fluid Flows
PhysicoChimie des Processus de Combustion et de l'Atmosphère
2015-2025
Centre National de la Recherche Scientifique
2012-2024
Université de Lille
2010-2024
University of Duisburg-Essen
2013
Laboratoire de Physique des Lasers, Atomes et Molécules
2008-2012
University of Padua
2008
Experimental evidence supporting the existence of PAH dimers in proximity soot nucleation region a methane laminar diffusion flame.
Laser-induced incandescence (LII) measurements were conducted to explore the ability of LII detect small soot particles less than 10 nm in two sooting flat premixed flames n-butane: a so-called nucleation flame obtained at threshold equivalence ratio Φ = 1.75, which incipient undergo only minor surface growth along flame, and more 1.95. Size by modeling time-resolved signals detected using 1064 laser excitation. Spectrally-resolved collected display similar blackbody-like behavior as mature...
The role of polycyclic aromatic hydrocarbons (PAHs) in the formation nascent soot particles flames is well established and yet detailed mechanisms are still not fully understood. Here we provide experimental evidence occurrence dimerization PAHs gas phase before a laminar diffusion methane flame, supporting hypothesis stabilization dimers through covalent bonds. main findings this work derive from comparative chemical analysis samples extracted to transition region highlight two different...
Ex situ analyses of substances extracted from flames provide useful albeit mostly qualitative information on the formation process soot and impact exhausts environment. An experimental setup based coupling laser desorption, ionization time-of-flight mass spectrometry (LD/LI/ToF-MS) is presented in past works as an alternative means to more traditional techniques like gas chromatography (GC) characterize polycyclic aromatic hydrocarbons (PAHs) content soot. In this paper, we go one step...
Abstract ‘Fluffy’ hydrogenated amorphous carbon (a-C:H) was synthesized using a dielectric barrier discharge plasma, driven by nanosecond high voltage pulses at 1 kHz frequency in helium-butane mixture. The a-C:H samples were characterized scanning and transmission electron microscopy, laser-assisted secondary ion mass spectrometry, Raman Fourier-transform infrared spectroscopy. We find that exhibit absorption features good agreement with those observed for carbonaceous dust IRAS 08572+3915...
ABSTRACT A chemical reaction mechanism was developed for the formation of iron oxide (Fe 2 O 3 ) from pentacarbonyl (Fe(CO) 5 in a low‐pressure hydrogen–oxygen flame reactor. In this paper, we describe an extensive approach flame‐precursor chemistry and development novel model Fe gas phase. The detailed is reduced implementation two‐dimensional, reacting flow simulations. comprehensive simulation completed by growth nanoparticles. exhaustive compact validated using experimental data...
Due to the exponential increase in aircraft traffic recent decades, role of soot particles emitted by engines on radiative forcing needs be addressed, and especially their interaction with clouds has better understood quantified. In this work, we investigate hygroscopic properties fresh aged sampled line a kerosene flame. The activated fraction (Fa) size selected is measured means variable supersaturation condensation nucleus counter at several heights above burner (HAB), thereby probing...
Selective on-line identification of polycyclic aromatic hydrocarbons (PAHs) formed in a low-pressure methane sooting flame, carried out using the double imaging Photoelectron Photoion Coincidence Spectroscopy method (i<sup>2</sup>PEPICO).
Determining the soot volume fraction (fv) in combustion environments requires detailed knowledge of optical properties particles, and particular their absorption function E(m). This study addresses a fundamental lack information on 2-4 nm particles. Recent works based modeling photoelectron emission yields UV-vis-NIR-absorption measurements found sharp decrease E(m) with particle size vis-NIR spectral region, which is inconsistent situ detection particles near-infrared region by...
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is used to provide detailed information on the surface chemical composition of soot. An analytical protocol proposed and tested a laboratory flame, results are compared with our previous measurements provided by two-step laser (L2MS).This work details: (1) development dedicated apparatus sample combustion products from atmospheric flames deposit them substrates suitable for TOF-SIMS analysis; (2) choice deposition substrate material...
The nonlinear optical properties of a functionalized poly(thiophene azine), namely, poly(3,4-didodecylthiophene PAZ, at the telecommunication wavelength 1550 nm are investigated by means closed-aperture z-scan technique in both thin films and solutions. Values chi((3))=(2.4+/-0.4)x10(-13) esu, n(2)=(4.0+/-0.7)x10(-15) cm(2) W(-1), gamma=(4.5+/-0.7)x10(-34) esu estimated for third-order (Kerr) susceptibility, intensity-dependent refractive index, molecular second hyperpolarizability solution...
Abstract Premixed low-pressure flat-flame reactors can be used to investigate the synthesis of nanoparticles. The present work examines flow field inside such a reactor during formation carbon (soot) and iron oxide (from Fe(CO)5) nanoparticles, how it affects measurements nanoparticle size distribution. symmetry impact buoyancy were analysed by three-dimensional simulations distribution was obtained particle mass spectrometry (PMS) via molecular beam sampling at different distances from...
Building on a recently proposed comprehensive methodology, we propose herein comparative analysis of soot particles produced by three different sources.
In order to tackle the climate emergency, it is imperative advance cleaner technologies reduce pollutant emission as soot particles. However, there still a lack of complete understanding mechanisms responsible for their formation. this work, we performed an investigation devoted study persistent radicals potentially involved in formation particles, by continuous wave and pulsed electron paramagnetic resonance. This work provides experimental evidence presence nascent highly branched,...