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Inter-species variabilities of droplet transport, size change, and deposition in human and rat respiratory systems: An in silico study J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-23 Hamideh Hayati; Yu Feng; Myron Hinsdale
To speculate on human responses from animal studies, scale-up factors (body weight, lung volume, or lung surface area ratios) are currently used to extrapolate aerosol lung deposition from animal to human. However, those existing scale-up methods between animals and humans neglected two important inter-subject variability factors: (1) the effect of anatomical differences in respiratory systems from
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Composite micro/nano fibrous air filter by simultaneous melt and solution electrospinning J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-19 Dalia Buivydiene; Ana M. Todea; Christof Asbach; Edvinas Krugly; Dainius Martuzevicius; Linas Kliucininkas
This article presents a novel approach towards tackling the balance between filter efficiency and pressure drop by layering micro and nano fibres using melt and solution electrospinning. Polyamide fibre mats were fabricated by a prototype fibre printing apparatus, based on a combination of melt and solution electrospinning. Fibrous mats with favorable filtration performance characteristics were developed
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Dissipation and adhesion in collisions between amorphous FeO nanoparticles J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-22 Baochi D. Doan; Adrienne R. Dove; Patrick K. Schelling
How dust grains aggregate into planetesimals is still an open question. It is experimentally observed that binary collisions between micron-sized dust grains result in adhesion for collisions up to ∼1 ms-1. However, aggregates at scales ∼1 mm and above have been shown to exhibit fragmentation or bouncing at relevant collision velocities, resulting in a barrier preventing the formation of larger aggregates
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Insights into the evaporation characteristics of saliva droplets and aerosols: Levitation experiments and numerical modeling J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-22 Christian Lieber; Stefanos Melekidis; Rainer Koch; Hans-Jörg Bauer
Understanding the transmission phenomena of SARS-CoV-2 by virus-laden droplets and aerosols is of paramount importance for controlling the current COVID-19 pandemic. Detailed information about the lifetime and kinematics of airborne droplets of different size is relevant in order to evaluate hygiene measures like wearing masks but also social distancing and ventilation concepts for indoor environments
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Performance comparison of SMPSs with soft X-ray and Kr-85 neutralizers in a humid atmosphere J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-21 Yiliang Liu; Michel Attoui; Jianmin Chen; Qing Li; Lin Wang
Scanning mobility particle sizer (SMPS) is widely used for particle number size distribution measurements of submicron particles. In this work, two TSI® SMPSs equipped with a soft X-ray neutralizer and a Kr-85 neutralizer, respectively, were operated in parallel to measure particle number size distributions of ambient air. An independent TSI® ultrafine condensation particle counter (CPC) was used as
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Molecular dynamics simulations of homogeneous nucleation of liquid phase in highly supersaturated propylene glycol vapors J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-31 Sergey N. Maximoff; Ali Salehi; Ali A. Rostami
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Journal of aerosol science A technical note effect of flow geometry on the nanoparticle output of a spark discharge generator J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-20 Dániel Megyeri; Attila Kohut; Zsolt Geretovszky
Spark discharge nanoparticle generators (SDGs) employ the method of spark ablation to generate nanoparticles (NPs) in the gas phase. The material plume ablated from two bulk electrodes is quenched and carried away by a controlled gas flow. The electrical circuit needed to maintain sparking and the gas/aerosol handling are usually rather simple to implement, therefore many different SDG designs exist
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Shaping electrospray deposition profile by a quadrupole: From circular to elliptical patterns J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-14 Huihui Xia; Boyang Yu; Kai Chang; Xinyan Zhao; Weiwei Deng
Thin films deposited by conventional electrospray of volatile solutions often give rise to rough morphology consisting of “coffee rings” formed by individual sessile droplets. This is due to the long average inter-droplet distance and low merging probability of deposited droplets within the sprayed circular area. We present a quadrupole configuration to form a squeezing electric field that compresses
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Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-08 R. Tischendorf; M. Simmler; C. Weinberger; M. Bieber; M. Reddemann; F. Fröde; J. Lindner; H. Pitsch; R. Kneer; M. Tiemann; H. Nirschl; H.-J. Schmid
In this report, a flame spray pyrolysis setup has been examined with various in situ extraction methods of particle samples along the flame axis. First, two precursor formulations leading to the formation of iron oxide nanoparticles were used in a standardized SpraySyn burner system, and the final particle outcome was characterized by a broad range of established powder characterization techniques
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Deposition features of inhaled viral droplets may lead to rapid secondary transmission of COVID-19 J. Aerosol Sci. (IF 2.649) Pub Date : 2021-01-09 Yidan Shang; Yao Tao; Jingliang Dong; Fajiang He; Jiyuan Tu
Inhaled viral droplets may immediately be expelled and cause an escalating re-transmission. Differences in the deposition location of inhaled viral droplets may have a direct impact on the probability of virus expelling. This study develops a numerical model to estimate the region-specific deposition fractions for inhalable droplets (1–50 μm) in respiratory airways. The results identified a higher
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Assessment of a regulatory measurement system for the determination of the non-volatile particulate matter emissions from commercial aircraft engines J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-10 John S. Kinsey; Robert Giannelli; Robert Howard; Brandon Hoffman; Richard Frazee; Michael Aldridge; Cullen Leggett; Katherine Stevens; David Kittelson; William Silvis; Jeffrey Stevens; Prem Lobo; Steven Achterberg; Jacob Swanson; Kevin Thomson; Timothy McArthur; Donald Hagen; Max Trueblood; Mikal Durlicki
The SAE International has published Aerospace Information Report (AIR) 6241 which outlined the design and operation of a standardized measurement system for measuring non-volatile particulate matter (nvPM) mass and number emissions from commercial aircraft engines. Prior to this research, evaluation of this system by various investigators revealed differences in nvPM mass emissions measurement on the
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CFD simulations to improve the aerosol tangential inlet of a Differential Mobility Analyzer J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-24 I. Ibarra; J.J. Rodriguez-Maroto; E. Rojas; D. Sanz
Differential Mobility Analyzers (DMA) have been studied for decades to classify a wide range of particle sizes. Its correct behavior is determined by the resolution, influenced by Brownian diffusion losses, distortions in the electric and flow field. The design configuration, especially inlets and outlets, can be a reason of these effects, affecting the DMA reliability. One of these configurations
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Evidence of inter-particles collision effect in airflow resuspension of poly-dispersed non-spherical tungsten particles in monolayer deposits J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-24 Anthony Rondeau; Samuel Peillon; Ana M. Vidales; Jesica Benito; Rodolfo Uñac; Jean-Christophe Sabroux; François Gensdarmes
Poly-dispersed particle resuspension by turbulent airflow was experimentally studied in a wind tunnel called BISE. The set-up was carefully validated to produce reference airflows with three absolute pressures and friction velocities values. Monolayer deposits of poly-dispersed tungsten particles on tungsten surfaces were used for the experiments. The fraction of detached particles by size bin from
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Ion induced nucleation based-generator of strictly singly charged (solid - liquid) polydisperse particles up to 1 μm J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-14 Michel Attoui
Calibration of optical counters, condensation particle counters, electrical impactors, filtration efficiency measurement, heterogeneous condensation (and many other laboratory applications in aerosol science and technology) are widely used with singly charged particles classified by a differential mobility analyzer with particles smaller than 1 μm. Nevertheless the method presents an ambiguity because
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Atmospheric clusters to nanoparticles: Recent progress and challenges in closing the gap in chemical composition J. Aerosol Sci. (IF 2.649) Pub Date : 2020-12-11 James N. Smith; Danielle C. Draper; Sabrina Chee; Michelia Dam; Hayley Glicker; Deanna Myers; Adam E. Thomas; Michael J. Lawler; Nanna Myllys
Aerosol nanoclusters (AN), defined here as molecular aggregates suspended in a gas with dimensions between 2 and 10 nm, are the link between substances that we think of as molecules, or the “gas phase,” and those that we consider as particles, or the “condensed phase.” The ability to measure and model the physical and chemical properties of size-resolved AN, which at present is rudimentary at best
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Generating an aerosol of homogeneous, non-spherical particles and measuring their bipolar charge distribution J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-23 Tyler J. Johnson; Robert T. Nishida; Xiao Zhang; Jonathan P.R. Symonds; Jason S. Olfert; Adam M. Boies
The Aerodynamic Aerosol Classifier (AAC) and Differential Mobility Analyzer (DMA) are aerosol classifiers commonly used to generate a monodispersed aerosol by selecting particles within a narrow range of relaxation times or electrical mobilities, respectively. However, generating an aerosol of homogeneous particles, which has narrow ranges of particle mass, mobility and relaxation time simultaneously
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Lung deposition versus inhalable sampling to estimate body burden of welding fume exposure: A pilot sampler study in stainless steel welders J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-20 Ashley Newton; Berrin Serdar; Karin Adams; L. Miriam Dickinson; Kirsten Koehler
This pilot study evaluated the ability of a lung deposition sampler (LDS) to estimate body burden by comparing lung-deposited and inhalable nickel and chromium exposures to biomarkers of internal dose. A cohort of stainless steel welders (N = 18) wore side-by-side inhalable and lung deposition samplers for two Monday shifts and urine samples were collected pre- and post-shift. Samplers were analyzed
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Multispecies aerosol evolution and deposition in a human respiratory tract cast model J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-28 Mahdi Asgari; Francesco Lucci; Arkadiusz K. Kuczaj
Accurate predictions of aerosol transport, evolution, and deposition in the human airways are crucial for inhalation dosimetry investigations. Inhaled aerosol transported through the airways undergoes thermodynamic changes due to changes in temperature and humidity. Aerosol evolution processes are particularly important for liquid multispecies aerosols. These aerosols are sensitive to condensation
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A review of contact force models between nanoparticles in agglomerates, aggregates, and films J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-20 Stefan Christian Endres; Lucio Colombi Ciacchi; Lutz Mädler
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Investigation on sub-23 nm particles and their volatile organic fraction (VOF) in PFI/DI spark ignition engine fueled with gasoline, ethanol and a 30 %v/v ethanol blend J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-27 Silvana Di Iorio; Francesco Catapano; Agnese Magno; Paolo Sementa; Bianca Maria Vaglieco
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A systematic investigation on the effects of temperature and relative humidity on the performance of eight low-cost particle sensors and devices J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-13 Yangyang Zou; Jordan D. Clark; Andrew A. May
Low-cost particle sensors are rapidly gaining popularity for indoor air quality monitoring, but their accuracy has been shown to vary among products and among environments in which they operate. Previous research has explored the effect of environmental conditions including temperature and humidity on sensor accuracy and found appreciable effects of these variables in many cases. We extend this work
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Morphology of particulate deposits formed on a single filter fibre by exposure to mixed aerosol flow J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-15 Julian Zoller; Amin Zargaran; Kamil Braschke; Jörg Meyer; Uwe Janoske; Achim Dittler
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The effects of meteorological conditions and long-range transport on PM2.5 levels in Hanoi revealed from multi-site measurement using compact sensors and machine learning approach J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-11 Bich-Thuy Ly; Yutaka Matsumi; Tuan V. Vu; Kazuhiko Sekiguchi; Nguyen Thi Thu Thuy; Pham Chau Thuy; Trung-Dung Nghiem; Ich-Hung Ngo; Yuta Kurotsuchi; Nguyen Thi Thu Hien; Tomoki Nakayama
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Air quality during and after the commonwealth Games 2018 in Australia: Multiple benefits of monitoring J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-10 Tara Kuhn; Rohan Jayaratne; Phong Thai; Bryce Christensen; Xiaoting Liu; Matthew Dunbabin; Riki Lamont; Isak Zing; David Wainwright; Christian Witte; Donald Neale; Lidia Morawska
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Aerosol dynamics simulations of the anatomical variability of e-cigarette particle and vapor deposition in a stochastic lung J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-06 Lukas Pichelstorfer; Renate Winkler-Heil; Michael Boy; Werner Hofmann
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The effectiveness of drones in measuring particulate matter J. Aerosol Sci. (IF 2.649) Pub Date : 2020-11-03 Hayden A. Hedworth; Tofigh Sayahi; Kerry E. Kelly; Tony Saad
The use of low-cost air pollution sensors mounted on drones is an exciting new approach to conduct affordable and highly resolved air quality measurements. However, the air flow around a drone consists of complex, unsteady turbulent structures which interact directly with ambient particulate matter and gases. These interactions influence the transport of fine particulate matter (e.g. PM2.5) and, subsequently
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Optimization of an air-liquid interface in vitro cell co-culture model to estimate the hazard of aerosol exposures J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-31 Rui-Wen He; Hedwig M. Braakhuis; Rob J. Vandebriel; Yvonne C.M. Staal; Eric R. Gremmer; Paul H.B. Fokkens; Claudia Kemp; Jolanda Vermeulen; Remco H.S. Westerink; Flemming R. Cassee
Inhalation exposure to environmental and occupational aerosol contaminants is associated with many respiratory health problems. To realistically mimic long-term inhalation exposure for toxicity testing, lung epithelial cells need to maintained and exposed under air-liquid interface (ALI) conditions for a prolonged period of time. In addition, to study cellular responses to aerosol particles, lung epithelial
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Application of the “Rock'n’Roll” (RNR) resuspension model with non-zero slip velocities on particle and substrate surfaces J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-25 Dongchi Yu; Fei Hu
Studies on the flow-induced particle resuspension have great significance for engineering applications of many areas, and several established resuspension models have been developed for the analysis of particle resuspension in an atmospheric environment. However, for flow with a non-negligible particle Knudsen number (the ratio between the mean free path of gas and the particle radius), which is commonly
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An experimentally validated model of diffusion charging of arbitrary shaped aerosol particles J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-25 Li Li; Ranganathan Gopalakrishnan
Particle shape strongly influences the diffusion charging of aerosol particles exposed to bipolar/unipolar ions and accurate modeling is needed to predict the charge distribution of non-spherical particles. A prior particle-ion collision kernel βi model including Coulombic and image potential interactions for spherical particles is generalized for arbitrary shapes following a scaling approach that
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A data-driven approach for characterizing community scale air pollution exposure disparities in inland Southern California J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-28 Khanh Do; Haofei Yu; Jasmin Velasquez; Marilyn Grell-Brisk; Heather Smith; Cesunica E. Ivey
In 2017, Assembly Bill 617 was approved in state of California, which mandated the allocation of resources for addressing air pollutant exposure disparities in underserved communities across the state. The bill stipulated the implementation of community scale monitoring and the development of local emissions reductions plans. We aimed to develop a streamlined, robust, and accessible PM2.5 exposure
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Applicability of benchtop multi-wavelength polar photometers to off-line measurements of the Multi-Angle Absorption Photometer (MAAP) samples J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-22 Sara Valentini; Vera Bernardoni; Ezio Bolzacchini; Davide Ciniglia; Luca Ferrero; Alice Corina Forello; Dario Massabó; Marco Pandolfi; Paolo Prati; Francesca Soldan; Gianluigi Valli; Jesús Yus-Díez; Andrés Alastuey; Roberta Vecchi
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Technical note: Using k-means to identify soot aggregates in transmission electron microscopy images J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-20 T.A. Sipkens; S.N. Rogak
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Impact of the competition between aggregation and surface growth on the morphology of soot particles formed in an ethylene laminar premixed flame J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-20 José Morán; Alexandre Poux; Jérôme Yon
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Regional deposition of the allergens and micro-aerosols in the healthy human nasal airways J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-19 Mohammad Hazeri; Mohammad Faramarzi; Sasan Sadrizadeh; Goodarz Ahmadi; Omid Abouali
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Measurement of the porosity of a pseudo-spherical nanostructured particle deposit formed by filtration J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-08 Jonathan Nuvoli; Soleiman Bourrous; François-Xavier Ouf; Dominique Thomas
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Breath-, air- and surface-borne SARS-CoV-2 in hospitals J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-15 Lian Zhou; Maosheng Yao; Xiang Zhang; Bicheng Hu; Xinyue Li; Haoxuan Chen; Lu Zhang; Yun Liu; Meng Du; Bochao Sun; Yunyu Jiang; Kai Zhou; Jie Hong; Na Yu; Zhen Ding; Yan Xu; Min Hu; Lidia Morawska; Yuanhang Zhang
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Evaluation of white-box versus black-box machine learning models in estimating ambient black carbon concentration J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-15 Pak L. Fung; Martha A. Zaidan; Hilkka Timonen; Jarkko V. Niemi; Anu Kousa; Joel Kuula; Krista Luoma; Sasu Tarkoma; Tuukka Petäjä; Markku Kulmala; Tareq Hussein
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High-efficiency dry powder aerosol delivery to children: Review and application of new technologies J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-14 Karl Bass; Dale Farkas; Amr Hassan; Serena Bonasera; Michael Hindle; Worth Longest
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In Vitro to ex Vivo/In Vivo Correlation (IVIVC) of dissolution kinetics from inhaled particulate solutes using air/blood barrier models: Relation between in vitro design, lung physiology and kinetic output of models J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-11 Per Gerde; Maria Malmlöf; Ewa Selg
Correlating data from in vitro dissolution testing of inhaled particulate pharmaceuticals or air pollutants with the dissolution and distribution to the blood circulation of the same aerosols following inhalation in vivo is a major challenge. Better methods could benefit both inhaled drug development and the risk assessment of air pollutants. Five properties known to influence the results produced
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Improvement of aerosol spray scavenging efficiency with water mist J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-13 Hui Liang; Qian Zhou; Nejdet Erkan; Shunichi Suzuki
The resolidified fuel debris from the damaged Fukushima Daiichi reactors must be cut into small pieces prior to removing it from reactor buildings. Submicron radioactive aerosol particles are likely to be generated and dispersed into the primary containment vessel (PCV) atmosphere during this cutting process. However, traditional sprays cannot effectively scavenge aerosol particles with diameters in
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Measuring electrostatic charge on pneumatically generated spray drops J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-09 Mei W. Tessum; Peter C. Raynor
Activities such as the suppression of coal dust would benefit from an improved understanding about how the presence of surfactant alters the charge distribution of spray drops. However, there is no standard method to measure charge and size distributions of nozzle-generated spray drops. To fill this gap, a new spray drop charge measurement system was developed to measure a broad range of sizes and
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Numerical and experimental investigation on the performance of a ventilated chamber for low-cost PM sensor calibration J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-07 Huang Zhang; Renhui Ruan; Shruti Choudhary; Houzhang Tan; Pratim Biswas
Particulate matter (PM) sensors are popular for distributed monitoring due to their portability, low-cost and networking capabilities. To provide reliable data, these sensors have to be calibrated periodically in the laboratory. This is often done in chambers with several of them co-located, alongside several research grade instruments. It is important to confirm that the aerosol is well distributed
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Tutorial: Understanding the transport, deposition, and translocation of particles in human respiratory systems using Computational Fluid-Particle Dynamics and Physiologically Based Toxicokinetic models J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-01 Yu Feng; Jianan Zhao; Hamideh Hayati; Ted Sperry; Hang Yi
Dynamic modeling of how particulate matter (PM) transport, deposit, and translocate from human respiratory systems to systemic regions subject to indoor and outdoor exposures are essential for case-specific lung dosimetry predictions and occupational health risk assessments. Because of the invasive nature and imaging resolution limitations of existing in vitro and in vivo methods, Computational Fluid-Particle
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The size-mobility relationship of ions, aerosols, and other charged particle matter. J. Aerosol Sci. (IF 2.649) Pub Date : 2020-10-01 Carlos Larriba-Andaluz; Francesco Carbone
Electrical Mobility is arguably the property upon which some of the most successful classification criteria are based for aerosol particles and ions in the gas phase. Once the value of mobility is empirically obtained, it can be related to a geometrical descriptor of the charged entity through a size-mobility relationship. Given the multiscale range of sizes in the aerosol field, approaches that can
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Characterization of mesoscale inhomogeneity in nonwovens and its relevance in the filtration of fine mists J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-19 T. Penner; J. Meyer; A. Dittler
Structural properties in nonwoven materials, such as porosity and layer thickness, are typically spatially distributed on a micro- and mesoscale. The mesoscale inhomogeneity is visually perceived, inter alia, as the cloudiness of the nonwoven fabric or as inclusions in the bulk material. Differential box counting, which is a fractal based image analysis method, was used to assess the inhomogeneity
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Dynamics of aerosol generation and release – Dry powder inhaler performance considerations J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-19 Agata Dorosz; Marta Żaczek; Arkadiusz Moskal
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Size-resolved aerosol emissions from lignocellulosic biomass and biomass constituent pyrolysis under variable dilution temperatures J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-23 Luke P. McLaughlin; Erica L. Belmont
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Exceeding a resolving power of 50 for virus size determination by differential mobility analysis. J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-12 Luis Javier Perez Lorenzo,Juan Fernandez de la Mora
A recently described DMA designed for high resolution viral particle analysis (Perez-DMA; Perez-Lorenzo et al, 2020) is modified to decrease the relative peak full width at half maximum (FWHM) below previously achieved ≈3.3%. The electrode radii at the outlet slit (R1 = 1.01 cm; R2 = 2 cm) and the working length are almost unchanged (L = 114.9 vs. 116 mm). The laminarization trumpet and the radius
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Understanding vapor nucleation on the molecular level: A review J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-28 Chenxi Li; Ruth Signorell
Gas phase nucleation is a universal phenomenon that plays a crucial role in both natural settings and industrial processes. Despite more than 100 years’ work to decipher this highly dynamic process, our understanding of nucleation remains incomplete. In particular, the formation, decay, and structures of the initially formed nucleating clusters critically determine the overall behavior of the nucleation
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The link between delivered aerosol dose and inflammatory responses: Exposing a lung Cell Co-Culture system to selected Allergens and irritants J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-22 Christie M. Sayes; Madhuri Singal
Traditional in vivo inhalation studies to inform hazard identification and risk assessment are time-intensive and financially expensive. Cell culture models combined with aerosol exposure systems have shown promise as surrogates in screening assays when multiple substances require preliminary information on hazard potential associated with aerosolized materials. This paper presents two different aerosol
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Nanoparticle gas phase electrodeposition: Fundamentals, fluid dynamics, and deposition kinetics J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-01 Leslie Schlag; Nishchay A. Isaac; Helene Nahrstedt; Johannes Reiprich; Adriana Ispas; Thomas Stauden; Jörg Pezoldt; Andreas Bund; Heiko O. Jacobs
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Horizontal injection spray drying aerosol generator using an ultrasonic nozzle with clean counter flow J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-18 Jong Hun Kim; Haneol Lee; Weon Gyu Shin
We investigated a spray-drying aerosol generator that can generate micro-particles at high concentration using an ultrasonic nozzle. Unlike a conventional spray-drying aerosol generator that uses vertical spray with co-current sheath flow, we designed a new aerosol generator by using horizontal spray with co-current sheath flow combined with clean counter flow to increase particle generation efficiency
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Photochemistry of single optically trapped oleic acid droplets J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-15 Evelyne A. Parmentier; Grégory David; Pablo Corral Arroyo; Simone Bibawi; Kıvanç Esat; Ruth Signorell
We report the photodegradation of optically trapped oleic acid droplets by visible light in the absence of additional reactive gaseous species. The temporal evolution of the droplet's chemical composition and size is monitored by Raman spectroscopy and elastic light scattering, respectively. The dependencies on the oxygen amount in the surrounding gas phase (~0–20%), the droplet size (~500–3000 nm
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Helical fluid-particle flow dynamics for controlling micron-particle deposition in a representative human upper lung-airway model J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-06 Adithya Gurumurthy; Clement Kleinstreuer
The transport and deposition of inhaled micron particles is largely determined by their inlet conditions, breathing rate, and the individual airway geometry. In this study, helical air-particle flow is introduced which significantly affects the particle dynamics with applications to targeted drug delivery. Specifically, helical flow, which reduces axial momentum, can be controlled by varying the swirl
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Effective density and metals content of particle emissions generated by a diesel engine operating under different marine fuels J. Aerosol Sci. (IF 2.649) Pub Date : 2020-08-29 Ali Momenimovahed; Stéphanie Gagné; Zuzana Gajdosechova; Joel C. Corbin; Gregory J. Smallwood; Zoltan Mester; Brigitte Behrends; Volker Wichmann; Kevin A. Thomson
A differential mobility analyzer along with a centrifugal particle mass analyzer was employed to study the effect of fuel type on effective density for nascent and non-volatile particles generated by a marine diesel engine. The engine was operated at 1500 rpm at loads between 10% and 100%. Three different fuels were evaluated: diesel fuel, distillate marine oil Grade A, and intermediate fuel oil. A
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Approximated expression of the hygroscopic growth factor for polydispersed aerosols J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-16 Chang H. Jung; Young Jun Yoon; Junshik Um; Seoung Soo Lee; Kyung Man Han; Hye Jung Shin; Ji Yi Lee; Yong Pyo Kim
Hygroscopic growth of aerosols plays an important role in the characterization of atmospheric aerosols. Physico-chemical and optical properties of aerosols are dependent on relative humidity (RH) as well as on their size and composition. In this study, scattering enhancement factors, f(RH), for polydispersed aerosols were approximated. f(RH) of ammonium sulfate and ammonium nitrate (AS) and NaCl aerosols
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Risk assessment of airborne transmission of COVID-19 by asymptomatic individuals under different practical settings. J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-16 Siyao Shao,Dezhi Zhou,Ruichen He,Jiaqi Li,Shufan Zou,Kevin Mallery,Santosh Kumar,Suo Yang,Jiarong Hong
The lack of quantitative risk assessment of airborne transmission of COVID-19 under practical settings leads to large uncertainties and inconsistencies in our preventive measures. Combining in situ measurements and computational fluid dynamics simulations, we quantify the exhaled particles from normal respiratory behaviors and their transport under elevator, small classroom, and supermarket settings
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Aerosol generation from different wind instruments. J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-16 Ruichen He,Linyue Gao,Maximilian Trifonov,Jiarong Hong
The potential airborne transmission of COVID-19 has raised significant concerns regarding the safety of musical activities involving wind instruments. However, currently, there is a lack of systematic study and quantitative information of the aerosol generation during these instruments, which is crucial for offering risk assessment and the corresponding mitigation strategies for the reopening of these
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Determining real-time mass deposition with a quartz crystal microbalance in an electrostatic, parallel-flow, air-liquid interface exposure system J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-02 Kamaljeet Kaur; Dana Overacker; Hamidreza Ghandehari; Christopher Reilly; Robert Paine; Kerry E. Kelly
In vitro studies are the first step toward understanding the biological effects of particulate matter. As a more realistic exposure strategy than submerged culture approaches, air-liquid interface (ALI) in vitro exposure systems are gaining interest. One challenge with ALI systems is determining accurate particle mass deposition. Although a few commercially available ALI systems are equipped with online
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Utilization of scattering and absorption-based particulate matter sensors in the environment impacted by residential wood combustion J. Aerosol Sci. (IF 2.649) Pub Date : 2020-09-15 Joel Kuula; Milla Friman; Aku Helin; Jarkko V. Niemi; Minna Aurela; Hilkka Timonen; Sanna Saarikoski
Residential wood combustion, which is characterized by incomplete combustion, is a common source of particulate matter in suburban areas. This study 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. The measurement campaign, which lasted approximately
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