A5018366141- Atmospheric chemistry and aerosols
- Vehicle emissions and performance
- Catalytic Processes in Materials Science
- Advanced Combustion Engine Technologies
- Advanced Aircraft Design and Technologies
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Maritime Transport Emissions and Efficiency
- Oil, Gas, and Environmental Issues
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Radiative Heat Transfer Studies
- Advanced Power Generation Technologies
- Catalysis and Oxidation Reactions
- Signaling Pathways in Disease
- Scientific Research and Discoveries
- Microplastics and Plastic Pollution
- Rocket and propulsion systems research
- Combustion and Detonation Processes
- Global Energy and Sustainability Research
- Combustion and flame dynamics
- Mechanisms of cancer metastasis
- Nanoparticles: synthesis and applications
- nanoparticles nucleation surface interactions
- Air Traffic Management and Optimization
ETH Zurich
2022-2024
University of British Columbia
2019-2021
Understanding the dynamics of soot formation and growth during combustion jet fuel is essential for mitigation aircraft engine emissions. Here, enclosed spray investigated its capacity to form with comparable characteristics that from engines. For this, microscopy, scanning mobility particle, X-ray diffraction & Raman spectroscopy measurements discrete element modeling (DEM) are employed along flame centerline at various Effective eQuivalence Ratios (EQR). The DEM-derived primary particle...
Soot from jet fuel combustion in aircraft engines contributes to global warming through the formation of contrail cirrus clouds that make up 56% total radiative forcing aviation. Here, elimination such emissions is explored N2 injection (containing 0–25 vol % O2) at exhaust enclosed spray nicely emulates soot emissions. It shown injecting containing 5 O2 enhances polyaromatic hydrocarbons (PAHs) adsorb on surface soot. This increases number density and volume fraction by 25 80%,...
High-throughput, laboratory units for generation of aircraft-like soot are needed to quantify and understand the impact such emissions on public health climate change due high costs limited access aircraft engines. Enclosed spray combustion jet fuel is used here generate concentrations, up 255 mg/m3, three orders magnitude higher than those typically obtained by widely generators that use vapor-fed flames. This attributed mostly real fuels. The large mass concentrations enable routine...
Methodologies across the dispersion preparation, characterization, and cellular dosimetry of hydrophilic nanoparticles (NPs) have been developed used extensively in field nanotoxicology. However, hydrophobic NPs pose a challenge for aqueous culture media using conventional methods that include sonication followed by mixing medium interest dosimetry. In this study, robust methodology preparation stable dispersions studies is introducing continuous energy over time via stirring...
Non-volatile particle emissions from a marine engine fueled by either diesel or natural gas (NG) blended with pilot were investigated via transmission electron microscopy (TEM). The most common particles (> 95% number) soot aggregates. These "typical" aggregates exhibited primary diameters of 20.7 ± 1.9 and 26.9 1.7 for 100 nm when NG fuel used, respectively. Highly non-uniform aggregates, distinct groups smaller larger monomers, visible in all the samples but occurred frequently fueling at...
Transmission electron microscopy of soot aggregates is performed using a tilting-stage with view angles from –60 to +50 degrees. The resulting series images was used produce videos and solid models aid in the visualization structure. 31 for each aggregate were analyzed various 2D image processing techniques. It found that measurements primary particle size varied by less than 16% as changed. Projected area only 6% viewing angle These variations are comparable errors expected processing....
Abstract. Soot from aircraft engines deteriorates air quality around airports and can contribute to climate change primarily by influencing cloud processes contrail formation. Simultaneously, emit carbon dioxide (CO2), nitrogen oxides (NOx), other pollutants which also negatively affect human health the environment. While urgent action is needed reduce all pollutants, strategies one pollutant may increase another, calling for a need decrease, example, uncertainty associated with soot's...
The objective of atems is to provide a suite open source analysis tools (largely in Matlab) for transmission electron microscopy (TEM) image that are specifically designed soot and related carbonaceous particles (e.g., tarballs).This codebase started as manual code by Dastanpour & Rogak (2014), with the first automated methods added et al. (2016).The current, version has been streamlined expanded include larger from literature, detailed following section.In this regard, key contribution...
Abstract. Soot from aircraft engines deteriorates air quality around airports and can contribute to climate change primarily by influencing cloud processes contrail formation. Simultaneously, emit CO2, nitrogen oxides (NOx) other pollutants which also negatively affect human health the environment. While urgent action is needed reduce all pollutants, strategies one pollutant may increase another, calling for a need decrease, example, uncertainty associated with soot’s contribution net...