Showing papers in "Journal of Aerosol Science in 2020"

TL;DR: With the complex environmental wind and RH conditions, the 6-feet social distancing policy may not be sufficient to protect the inter-person aerosol transmission, since the suspending micro-droplets were influenced by convection effects and can be transported from the human coughs/sneezes to the other human in less than 5 s.

TL;DR: Wearing simple homemade or surgical face masks in public is highly recommended if no particle filtrating respiratory mask is available, to take full advantage of the three fundamental protective mechanisms these masks provide.

TL;DR: The limited results in this study on worn masks made of alternative sterilization wrap indicated possible performance degradation of electret material caused by normal human wearing activities, suggesting the need of assessing respirator/mask decontamination strategy by testing practically worn-and-decontaminated/reused samples instead of unworn only-decrontaminated counterparts.

TL;DR: A review of state-of-the-art quantum chemical methods and cluster distribution dynamics models that are applied to study the formation and growth of atmospheric molecular clusters can be found in this paper.

TL;DR: In this article, the authors present a comprehensive uncertainty analysis for these methods that suggests that their present understanding on the sources of uncertainties quite well captures the observed deviations between different instruments in the size distribution measurements, and suggest guidelines for selecting suitable instruments for various applications.

TL;DR: In this article, the authors evaluated the performance of low-cost particulate matter (PM) sensors in the laboratory by exposing them to four different polydisperse aerosols (ammonium sulfate, nebulized Arizona road dust, NIST Urban PM, wood smoke, and polystyrene latex spheres (PSL) ranging from 0.1 to 2.0μm in diameter.

TL;DR: In this paper, the effects of breathing profile, breathhold and gravity orientation on deposition in the deep airway were examined to assess whether a small number of DLMs could be used to provide deposition predictions in the entire peripheral lung, with the ultimate goal being the integration of DLM with imaging-derived models of the upper airways for whole-lung deposition predictions.

TL;DR: In this paper, the interaction energy between two spherical nanoparticles was derived from the pair-wise Lennard-Jones attractive and repulsive potentials of the constituent atoms of the two particles, and proposed a coagulation efficiency model based on the average particle kinetic energy and the potential well depth.

TL;DR: In this paper, the authors investigated different approaches for the determination of morphological parameters of fractal-like particle aggregates from TEM images of soot and compared the results to derive an optimized evaluation strategy for TEM nanoparticle characterization.

TL;DR: In this paper, the results of the first inter-comparison of these three reference systems using a CFM56-7B26/3 aircraft engine were reported to establish repeatability and intermediate precision of the sampling and measurement systems as part of the multi-agency international collaborative projects.

TL;DR: In this article, a review summarizes the state of knowledge for the key morphological properties of nvPM emitted from aircraft turbine engines, i.e., aggregate structure, primary particle size, aggregate size and size distribution, effective density, mass mobility exponent, and internal structure.

TL;DR: In this article, an anatomically realistic model of airway passage including vestibule to the end of the trachea was constructed from CT images of a 24-year-old healthy woman.

TL;DR: Based on the prior work of Chahl and Gopalakrishnan (2019) to infer particle-ion collision time distributions using a Langevin Dynamics (LD) approach, this paper developed a model for the non-dimensional particle ion diffusion collision kernel β i or H.

TL;DR: In this article, the principles of particle formation of desired morphology, including the topological background for obtaining allowed packing forms and conflict set theory to describe the self-organization process, are presented.

TL;DR: In this paper, the formation of the cone-jet in the electrospray process is investigated with considering the space charge effects, and an improved model of considering the effect of charged droplet emitted from the tip of cone-joint on the external electric field is proposed.

TL;DR: In this paper, the effects of non sphericity and particle orientation on mineral dust gravitational settling are studied for prolate spheroids in the range of Reynolds number up to 100.

TL;DR: In this paper, a critical review of methods used to invert tandem measurements to determine the two-dimensional distribution of particle mass and mobility is provided, including weighted least squares analysis, Twomey-type approaches, a maximum entropy method, Tikhonov regularization (over a range of regularization parameters), and statistical inversion.

TL;DR: In this article, the authors used a seven channel Aethalometer at a suburban site of Nanjing, East China from January 2015 to December 2016 to study its temporal variations and quantify the magnitude of BC from fossil fuel (BCff) and biomass burning (BCbb) sources.

TL;DR: In this article, a review of methodologies to measure the bipolar charge distribution of nanoparticles is completed, including their advantages/disadvantages and sequential development, and a new development, which uses an Aerodynamic Aerosol Classifier (AAC) and Differential Mobility Analyzer (DMA) in tandem for a similar purpose.

TL;DR: Insight is shed into interaction of nanoparticle and ions in high electrical field environment, that occur in primary EHD driven flows and in the secondary flows generated by corona discharge.

TL;DR: In this paper, the characteristics of microbial activity in atmospheric aerosols in Xi'an, China, were determined using the fluorescein diacetate hydrolysis method, and the influences of meteorological factors, height and water-soluble inorganic ions on microbial activity were examined.

TL;DR: In this paper, an improved version of a measurement method was used to obtain δ 13C signatures on organic aerosols desorbed from filter samples at three different desorption temperatures (200, 350, and 650°C) and apply it in a source study.

TL;DR: In this paper, the authors investigated the usability of three different scattering-based particulate matter (PM) sensors and an absorption-based black carbon (BC) sensor in an environment impacted by wood combustion emissions.

TL;DR: In this article, the authors used molecular dynamics trajectory calculations to determine the homogeneous and heterogeneous binding rate coefficients of SiO2 (silica) nanoclusters composed of 18, 144, and 333 atoms.

TL;DR: In this paper, the authors describe the loss of clusters due to condensation sink by using heterogeneous nucleation theory, and investigate if ineffectiveness of heterogenous nucleation can result in a significantly lowered effective condensation sinks.

TL;DR: In this paper, the authors compared the size distributions of particles and the levels of Volatile Organic Compounds (VOCs) exhaled by both e-cigarette and tobacco cigarette users.

TL;DR: A novel method based on a flow-through chamber bag inhalation system capable of providing fast and reliable quantification of size-resolved and total deposition of UFP in respiratory tracts of children and adults is demonstrated.

TL;DR: In this paper, an efficient parallelized tool, IMoS, was proposed to calculate the mobility of nanoparticles in a variety of gases using all-atom models, which allows for different types of calculations that range from the efficient Projection Approximation (PA) algorithm to the 4-6-12 Lennard-Jones potential trajectory method.

TL;DR: The inhalation route has a substantial influence on the fate of inhaling particles and the knowledge of respiratory deposition is important also for occupational safety or targeted delivery of inhaled pharmaceuticals.

TL;DR: The treatment of severe asthmatic subjects who have constricted airways with inhalation aerosols may need submicron-sized hygroscopic particles to compensate for particle growth, if one targets for delivering to the peripheral region.