A5101485627- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Atmospheric chemistry and aerosols
- Carbon Nanotubes in Composites
- Catalytic Processes in Materials Science
- nanoparticles nucleation surface interactions
- Vehicle emissions and performance
- Air Quality and Health Impacts
- Advanced Chemical Physics Studies
- Astro and Planetary Science
- Fire dynamics and safety research
- Gas Dynamics and Kinetic Theory
- Graphene research and applications
- Laser-induced spectroscopy and plasma
- Coal Combustion and Slurry Processing
- Thermochemical Biomass Conversion Processes
- Neuroscience and Neural Engineering
- Laser-Ablation Synthesis of Nanoparticles
- Toxic Organic Pollutants Impact
- Anodic Oxide Films and Nanostructures
- Petroleum Processing and Analysis
- Nanoparticles: synthesis and applications
- Diamond and Carbon-based Materials Research
- Carbon and Quantum Dots Applications
- Rocket and propulsion systems research
Institute for Research on Combustion
2006-2020
University of Naples Federico II
1994
Combustion-generated soot particles can have significant impact on climate, environment and human health. Thus, understanding the processes governing formation of in combustion is a topic ongoing research. In this study, high-resolution atomic force microscopy (AFM) was used for direct imaging building blocks forming early stages formation. Incipient were collected right after particle nucleation zone slightly sooting ethylene/air laminar premixed flame at atmospheric pressure analyzed by...
Significance Flame-formed carbon nanoparticles are observed to exhibit quantum confinement behaviors. We demonstrate that the size dependence of photoemission ionization energy in air and optical band gap flame-generated particles can be well explained by available theory. Carbon comprising mainly polycyclic aromatic hydrocarbons widespread nature. The results have important consequences problems ranging from interpreting infrared emission spectra dusts interstellar media, evaluating climate...
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...
The effect of pressure on soot particle nanostructure has been investigated by Raman spectroscopy. For the first time samples produced in a set coflow methane–air laminar diffusion flames stabilized high-pressure combustion chamber, and collected thermophoresis, have analyzed to obtain chemical/structural information. first-order spectra particles at several elevated pressures compared. As result, within range pressures, i.e., from 10 20 bar, our measurements show that does not depend...
Soot nucleation is one of the most complex and debated steps soot formation process in combustion. In this work, we used scanning tunneling microscopy (STM) spectroscopy (STS) to probe morphological electronic properties incipient particles formed right behind flame front a lightly sooting laminar premixed ethylene air. Particles were thermophoretically sampled on an atomically flat gold film mica substrate. High-resolution STM images obtained for first time showing morphology sub-5 nm...
Molecules constituting nascent soot particles have been analyzed by two-step laser desorption ionization mass spectrometry. Three samples collected from a slightly sooting ethylene/air premixed flame with the aim to investigate composition in transition nucleated just-grown particles. Sampling locations selected based on evolution of particle size distribution along axis. The spectrometric results point strong molecular composition. Just-nucleated is rich polycyclic aromatic hydrocarbons...
Recent advances in the soot studies have shown experimental evidences of π-radicals and cross-linked structures among molecular constituents just-nucleated particles. could an important role particle nucleation by increasing binding energy between polycyclic aromatic hydrocarbons with respect to pure van der Waals interactions. In this work we use density functional theory Grimme D3 dispersion correction (DFT-D3) hybrid localized Gaussian basis set (B3LYP/6-31G**) analyze classify clustering...
The size distribution of nanoparticles generated in nonsooting ethylene/air premixed flames and collected water samples has been evaluated using two particle-sizing techniques that show high sensitivity to particles the nanometer range: dynamic light scattering electrospray-differential mobilty analysis. A d 63 2.85 nm estimated. By combining results ex situ determination extinction measurements UV, complex refractive index determined. result is good agreement with value we previously used...
ABSTRACT Phenomenological aspects of formation, destruction, and coagulation high molecular mass structures formed in the main oxidation zone rich premixed flames well below soot threshold limit have been examined. High transparent to visible radiation, previously detected preinception region forming flames, are also present formation limit. The onset ultra-violet fluorescence within implies that these species is a very fast process can be considered as “polymerization” small aromatic groups...