A5073918287- Fuel Cells and Related Materials
- Advancements in Solid Oxide Fuel Cells
- Atmospheric chemistry and aerosols
- Aerosol Filtration and Electrostatic Precipitation
- Air Quality Monitoring and Forecasting
- Particle Dynamics in Fluid Flows
- Electrocatalysts for Energy Conversion
- Coagulation and Flocculation Studies
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Inhalation and Respiratory Drug Delivery
- Infection Control and Ventilation
- Electrostatics and Colloid Interactions
- Chemical Looping and Thermochemical Processes
- COVID-19 epidemiological studies
- Spectroscopy and Laser Applications
- Energy and Environment Impacts
- Fire Detection and Safety Systems
- Smoking Behavior and Cessation
- Power Transformer Diagnostics and Insulation
- Cyclone Separators and Fluid Dynamics
- Chemical Safety and Risk Management
- COVID-19 diagnosis using AI
- nanoparticles nucleation surface interactions
- Fullerene Chemistry and Applications
Atmos (Czechia)
2025
University of Waterloo
2025
University of Alberta
2020-2023
University of Cambridge
2017-2020
Queen's University
2013-2018
Abstract Recent increases in marijuana use and legalization without adequate knowledge of the risks necessitate characterization billions nanoparticles contained each puff smoke. Tobacco smoke offers a benchmark given that it has been extensively studied. particles are quantitatively similar volatility, shape, density number concentration, albeit with differences size, total mass chemical composition. Particles from on average 29% larger mobility diameter than tobacco contain 3.4× more mass....
Abstract Determining the viral load and infectivity of SARS-CoV-2 in macroscopic respiratory droplets, bioaerosols, other bodily fluids secretions is important for identifying transmission modes, assessing risks informing public health guidelines. Here we show that Ribonucleic Acid (RNA) participants’ naso-pharyngeal (NP) swabs positively correlated with RNA they emitted both droplets >10 $$\upmu \hbox {m}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow>...
Continuous uniform <2-nm refractory catalyst production is realized for selective chiral SWCNT growth.
A review of methodologies to measure the bipolar charge distribution nanoparticles is completed, including their advantages/disadvantages and sequential development. This summary also provides context for a new development, which uses an Aerodynamic Aerosol Classifier (AAC) Differential Mobility Analyzer (DMA) in tandem similar purpose. It demonstrated that AAC-DMA system overcomes some significant limitations previous methodologies, such as multiply-charged particle artefacts low...
New emission legislation requires number concentration measurements of particles emitted by passenger cars during periodic technical inspections (PTI). For PTI suitable instruments are needed to detect faults, such as diesel particulate filter failures. Diffusion charging is well established a method for particle sensors and suited realize low-cost exhaust in the appropriate size regime. In order manufacture affordable instruments, should not only be low cost, but their calibration procedure...
Low-cost methods for measuring airborne microparticles and nanoparticles (aerosols) have remained elusive despite the increasing concern of health impacts from ambient, urban, indoor sources. While bipolar ion sources are common in smoke alarms, this work is first to exploit mean charge on an aerosol resulting a equilibrium establish experimentally its correlation properties particle size distribution. The net current produced demonstrated be linearly proportional product diameter total...
Direct ultraviolet (UV) photoionization enables electrical charging of aerosol nanoparticles without relying on the collision particles and ions. In this work, a low-strength electric field is applied during particle to capture charge as it photoemitted from in continuous flow, yielding novel current measurement. As conventional photocharging-based measurement devices, distinct remaining photocharged also measured downstream. The two currents are proportional total photoelectrically active...
Ultrafine aerosol particles are electrically charged in a range of devices to enable their detection, capture, and control. Direct ultraviolet (UV) photoionization enables increased charging some nanoparticle materials over alternative mechanisms such as diffusion charging, particularly size ranges below 50 nm diameter. The aim this work is provide modelling simulation ion particle charge discharge processes transport collection continuous flow. A non-dimensional analysis indicates regimes...
Photoacoustic spectroscopy (PAS) is a well-established method for sensitive and selective detection of trace gases such as NO2 CO2 (Bozoki, Pogany, Szabo 2011) well the measuremen...
Direct ultraviolet photoionization electrically charges particles using a mechanism distinct from diffusion charging. The purpose of this study is to evaluate aerosol photoemission theory as function particle size, concentration, material, and morphology. Particles are classified an aerodynamic classifier (AAC) subsequently measured with scanning mobility sizer (SMPS) measurement system in parallel. This configuration allows direct comparison photo-emission high concentrations initially...
Most analyses of fuel cell stacks consider either transport or electrochemical phenomena, but neglect the coupling between two. An original mathematical model was developed to solve equations coupled with heterogeneous reactions for large internal/external manifolds. The code used determine effect utilization on performance and temperature distribution. results are presented in terms fluid flow, pressure, temperature, voltage, current density distributions. discussion highlights importance...
In this paper, two distinct polymer electrolyte fuel cell stack models are constructed: a detailed numerical model (DNM) employing fine-scale computational mesh and coarse-mesh approach based on distributed resistance analogy (DRA) where diffusion terms in the transport equations replaced by rate terms. Both methods applied to 5-cell, high-temperature with an active area of 200 cm2 per cell. The polarization curve local current density distributions from both DRA DNM compared experimental...
Fine mode particulate matter (PM) is known to be a major risk for human health as it can cause respiratory and cardiovascular diseases. Whether produced from anthropogenic or natural processes, fine PM often electrically charged with positive, negative and/or bipolar charges. These preexisting charges can, in some cases, significantly affect measurements sensors which involve charging stage prior measurement by, e.g., electrometry. In this work, we demonstrate quantitatively the impact of...
Two computational fluid dynamics models have been developed to predict the performance of a solid oxide fuel cell stack, detailed and simplified model. In model, three dimensional momentum, heat, species transport equations are coupled with electrochemistry. diffusion terms in selectively replaced by rate within core region stack. This allows much coarser meshes be employed at fraction cost. Following mathematical description problem, results for single multi-cell stack presented....