74 results match your criteria Aerosol Science And Technology[Journal]


The coronavirus pandemic and aerosols: Does COVID-19 transmit via expiratory particles?

Aerosol Sci Technol 2020 3;0(0):1-4. Epub 2020 Apr 3.

Department of Chemical Engineering, Davis College of Engineering, University of California, Davis, California, USA.

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http://dx.doi.org/10.1080/02786826.2020.1749229DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7157964PMC

Field sampling of indoor bioaerosols.

Aerosol Sci Technol 2020 21;54(5):572-584. Epub 2019 Nov 21.

Department of Biochemistry, Microbiology, and Bioinformatics, Université Laval, Québec, Canada.

Because bioaerosols are related to adverse health effects in exposed humans and indoor environments represent a unique framework of exposure, concerns about indoor bioaerosols have risen over recent years. One of the major issues in indoor bioaerosol research is the lack of standardization in the methodology, from air sampling strategies and sample treatment to the analytical methods applied. The main characteristics to consider in the choice of indoor sampling methods for bioaerosols are the sampler performance, the representativeness of the sampling, and the concordance with the analytical methods to be used. Read More

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http://dx.doi.org/10.1080/02786826.2019.1688759DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6880939PMC
November 2019

Electrochemical Dithiothreitol Assay for Large-Scale Particulate Matter Studies.

Aerosol Sci Technol 2019 24;53(3):268-275. Epub 2019 Jan 24.

Dept of Chemistry, Colorado State University.

Particulate matter (PM) air pollution is associated with human morbidity and mortality. Measuring PM oxidative potential has been shown to provide a predictive measurement between PM exposure and adverse health impacts. The dithiothreitol (DTT) assay is commonly used to measure the oxidative potential of PM (PM less than 2. Read More

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http://dx.doi.org/10.1080/02786826.2018.1560391DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6777574PMC
January 2019
2 Reads

Simultaneous transmission and absorption photometry of carbon-black absorption from drop-cast particle-laden filters.

Aerosol Sci Technol 2019 ;53

Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, USA.

Simultaneous transmissivity and absorptivity measurements were carried out in the visible at a laser wavelength of 532 nm on drop-cast, carbon-black-laden filters under ambient (laboratory) conditions. The focus of this investigation was to establish the feasibility of this approach to estimate the mass absorption coefficient of the isolated particles and compare results to earlier work with the same carbon-black source. Transmissivity measurements were carried out with a laser probe beam positioned normal to the particle-laden filter surface. Read More

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http://dx.doi.org/10.1080/02786826.2019.1577950DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6774385PMC
January 2019

Determination of the distribution of infectious viruses in aerosol particles using water-based condensational growth technology and a bacteriophage MS2 model.

Aerosol Sci Technol 2019 19;53(5):583-593. Epub 2019 Mar 19.

Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, Florida, USA.

Inhalation of aerosols containing pathogenic viruses can result in morbidity, in some cases leading to mortality. The objective of this study was to develop a model for assessing how infectious viruses might distribute in airborne particles using bacteriophage MS2 as a surrogate for human viruses. Particle deposition in the respiratory system is size-dependent, and small virus-containing particles can be inhaled deeply into the lower lungs, potentially leading to more severe respiratory disease manifestations. Read More

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http://dx.doi.org/10.1080/02786826.2019.1581917DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6663101PMC

Collection of soot particles into aqueous suspension using a particle-into-liquid sampler.

Aerosol Sci Technol 2019 6;53(1):21-28. Epub 2018 Dec 6.

University of Vienna, Faculty of Physics, Vienna, Austria.

Steam collection devices collecting aerosol particles into liquid samples are frequently used to analyze water-soluble particulate material. The fate of water-insoluble components is often neglected. In this work, we show that fresh soot particles can be suspended into pure water using a steam collection device, the particle-into-liquid sampler (PILS, Weber et al. Read More

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http://dx.doi.org/10.1080/02786826.2018.1540859DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6382284PMC
December 2018
3 Reads

Generation of High Concentrations of Respirable Solid-Phase Aerosols from Viscous Fluids.

Aerosol Sci Technol 2018 30;52(8):933-952. Epub 2018 Jul 30.

KAER Biotherapeutics, 926 Andreasen Drive, Suite 105, Escondido, California, USA.

High outputs of respirable solid-phase aerosols were generated from viscous solutions or suspensions of low and high molecular weight polyvinylprrolidone (PVP) solutions, 10% (w/v) albumin and, gamma-globulin solutions as well as 10.3% (w/v) surfactant suspensions. A central fluid flow was aerosolized by coaxial converging compressed air. Read More

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http://dx.doi.org/10.1080/02786826.2018.1488078DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358172PMC
July 2018
3 Reads

Dihydroxyacetone levels in electronic cigarettes: Wick temperature and toxin formation.

Aerosol Sci Technol 2018 23;52(4):370-376. Epub 2018 Jan 23.

Department of Chemistry, Portland State University, Portland, Oregon, USA.

Recently, we reported the presence of dihydroxyacetone (DHA), the active ingredient in sunless tanners, in the aerosol of an electronic cigarette. DHA has been shown to react with DNA . The FDA restricts the use of DHA to external application only. Read More

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https://www.tandfonline.com/doi/full/10.1080/02786826.2018.1
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http://dx.doi.org/10.1080/02786826.2018.1424316DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6343856PMC
January 2018
11 Reads

Computational Analysis of Deposition and Translocation of Inhaled Nicotine and Acrolein in the Human Body with E-cigarette Puffing Topographies.

Aerosol Sci Technol 2018 26;52(5):483-493. Epub 2018 Mar 26.

Zhejiang University of Science and Technology, Hangzhou, 310023, China.

Recently, toxicants such as formaldehyde and acrolein were detected in electronic cigarette (EC) aerosols. It is imperative to conduct research and provide sufficient quantitative evidence to address the associated potential health risks. However, it is still a lack of informative data, i. Read More

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https://www.tandfonline.com/doi/full/10.1080/02786826.2018.1
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http://dx.doi.org/10.1080/02786826.2018.1447644DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6205743PMC
March 2018
5 Reads

Fate of pyrazines in the flavored liquids of e-cigarettes.

Aerosol Sci Technol 2018 21;52(4):377-384. Epub 2018 Feb 21.

American University of Beirut, Lebanon, Chemistry Department, Faculty of Arts and Sciences.

Popularity of electronic cigarettes (ECIGs) has increased tremendously among young people, in part due to flavoring additives in ECIG liquids. Pyrazines are an important class of these additives, and their presence in tobacco cigarettes has been correlated with increased acceptability of smoking among smokers and bystanders. Pyrazine use by the tobacco industry is therefore thought to encourage smoking. Read More

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http://dx.doi.org/10.1080/02786826.2018.1433293DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6141037PMC
February 2018
6 Reads

Size-Selective Sampling Performance of Six Low-Volume "Total" Suspended Particulate (TSP) Inlets.

Aerosol Sci Technol 2018 ;52(1):98-113

Alion Science and Technology, 1000 Park Forty Plaza #200, Durham, NC 27713.

Several low-volume inlets (flow rates ≤16.7 liters per minute (Lpm)) are commercially available as components of low-cost, portable ambient particulate matter samplers. Because the inlets themselves do not contain internal fractionators, they are often assumed to representatively sample "total" mass concentrations from the ambient air, independent of aerodynamic particle size and wind speed. Read More

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http://dx.doi.org/10.1080/02786826.2017.1386766DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5906806PMC
January 2018
6 Reads

Surgical Smoke Simulation Study: Physical Characterization and Respiratory Protection.

Aerosol Sci Technol 2018 29;52(1):38-45. Epub 2017 Sep 29.

Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, PO Box 670056, Cincinnati, OH, USA.

Exposure of operating room (OR) personnel to surgical smoke, a unique aerosol generated from the common use of electrocautery during surgical procedures, is an increasing health risk concern. The main objective of this simulation study was to characterize the surgical smoke exposure in terms of the particle number concentration and size distribution in a human breathing zone. Additionally, the performance of respiratory protective devices designed for ORs was examined using two commercially available N95 facepiece filtering respirators (FFRs) as well as the same FFRs modified with new faceseal technology. Read More

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http://dx.doi.org/10.1080/02786826.2017.1373180DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6873921PMC
September 2017

Trends in the oxidation and relative volatility of chamber-generated secondary organic aerosol.

Aerosol Sci Technol 2018 ;52(9):992-1004

United States Environmental Protection Agency, Office of Research and Development, Research Triangle Park, Durham, North Carolina, USA.

The relationship between the oxidation state and relative volatility of secondary organic aerosol (SOA) from the oxidation of a wide range of hydrocarbons is investigated using a fast-stepping, scanning thermodenuder interfaced with a high-resolution time-of-flight aerosol mass spectrometer (AMS). SOA oxidation state varied widely across the investigated range of parent hydrocarbons but was relatively stable for replicate experiments using a single hydrocarbon precursor. On average, unit mass resolution indicators of SOA oxidation (e. Read More

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http://dx.doi.org/10.1080/02786826.2018.1500014DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6827343PMC
January 2018

Electronic cigarette-generated aldehydes: The contribution of e-liquid components to their formation and the use of urinary aldehyde metabolites as biomarkers of exposure.

Aerosol Sci Technol 2018 23;52(11):1219-1232. Epub 2018 Aug 23.

American Heart Association - Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40292.

Electronic cigarettes (e-cigarette) have emerged as a popular electronic nicotine delivery system (ENDS) in the last decade. Despite the absence of combustion products and toxins such as carbon monoxide (CO) and tobacco-specific nitrosamines (TSNA), carbonyls including short-chain, toxic aldehydes have been detected in e-cigarette-derived aerosols up to levels found in tobacco smoke. Given the health concerns regarding exposures to toxic aldehydes, understanding both aldehyde generation in e-cigarette and e-cigarette exposure is critical. Read More

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http://dx.doi.org/10.1080/02786826.2018.1500013DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6711607PMC

Rapid Analysis of the Size Distribution of Metal-Containing Aerosol.

Aerosol Sci Technol 2017;51(1):108-115. Epub 2016 Oct 20.

Department of Occupational and Environmental Health, University of Iowa, Iowa.

Conventional methods to measure the metallic content of particles by size are time consuming and expensive, requiring collection of particles with a cascade impactor and subsequent metals analysis by inductively coupled plasma mass spectrometry (ICP-MS). In this work, we describe a rapid way to measure the size distribution of metal-containing particles from 10 nm to 20 μm, using a nano micro-orifice uniform-deposit impactor (nano-MOUDI) to size-selective and collect particles that are then analyzed with a field portable X-ray fluorescence (FP-XRF) to determine metal composition and concentration. The nano-MOUDI was used to sample a stainless-steel aerosol produced by a spark discharge system. Read More

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http://dx.doi.org/10.1080/02786826.2016.1245406DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5580826PMC
October 2016
7 Reads

Production of neutral molecular clusters by controlled neutralization of mobility standards.

Aerosol Sci Technol 2017 Aug 8;51(8):946-955. Epub 2017 May 8.

Department of Physics, University of Helsinki, Helsinki, Finland.

Measuring aerosols and molecular clusters below the 3 nm size limit is essential to increase our understanding of new particle formation. Instruments for the detection of sub-3 nm aerosols and clusters exist and need to be carefully calibrated and characterized. So far calibrations and laboratory tests have been carried out using mainly electrically charged aerosols, as they are easier to handle experimentally. Read More

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http://dx.doi.org/10.1080/02786826.2017.1328103DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5546065PMC
August 2017
2 Reads

Transport phenomena governing nicotine emissions from electronic cigarettes: model formulation and experimental investigation.

Aerosol Sci Technol 2017;51(1):1-11. Epub 2016 Nov 8.

Mechanical Engineering Department, Faculty of Engineering and Architecture, American University of Beirut, Beirut, Lebanon.

Electronic cigarettes (ECIGs) electrically heat and aerosolize a liquid containing propylene glycol (PG), vegetable glycerin (VG), flavorants, water, and nicotine. ECIG effects and proposed methods to regulate them are controversial. One regulatory focal point involves nicotine emissions. Read More

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https://www.tandfonline.com/doi/full/10.1080/02786826.2016.1
Publisher Site
http://dx.doi.org/10.1080/02786826.2016.1257853DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5502764PMC
November 2016
14 Reads

Absorption/Transmission Measurements of PSAP Particle-Laden Filters from the Biomass Burning Observation Project (BBOP) Field Campaign.

Aerosol Sci Technol 2017;51(4):451-466. Epub 2016 Dec 2.

Pacific Northwest National Laboratory.

Absorptivity measurements with a laser-heating approach, referred to as the laser-driven thermal reactor (LDTR), were carried out in the infrared and applied at ambient (laboratory) non-reacting conditions to particle-laden filters from a three-wavelength (visible) particle/soot absorption photometer (PSAP). The particles were obtained during the Biomass Burning Observation Project (BBOP) field campaign. The focus of this study was to determine the particle absorption coefficient from field-campaign filter samples using the LDTR approach, and compare results with other commercially available instrumentation (in this case with the PSAP, which has been compared with numerous other optical techniques). Read More

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http://dx.doi.org/10.1080/02786826.2016.1267856DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5497477PMC
December 2016
4 Reads

Near-Real Time Measurement of Carbonaceous Aerosol Using Microplasma Spectroscopy: Application to Measurement of Carbon Nanomaterials.

Aerosol Sci Technol 2016 08;50(11):1155-1166

Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221.

A sensitive, field-portable microplasma spectroscopy method has been developed for real-time measurement of carbon nanomaterials. The method involves microconcentration of aerosol on a microelectrode tip for subsequent analysis for atomic carbon using laser-induced breakdown spectroscopy (LIBS) or spark emission spectroscopy (SES). The spark-induced microplasma was characterized by measuring the excitation temperature (15,000 - 35,000 K), electron density (1. Read More

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http://dx.doi.org/10.1080/02786826.2016.1224804DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5476210PMC
August 2016
38 Reads

Real-time measurement of size-resolved elemental composition ratio for flame synthesized composite nanoparticle aggregates using a tandem SMPS-ICP-OES.

Aerosol Sci Technol 2017;51(3):311-316. Epub 2016 Dec 16.

Aerosol and Air Quality Research Laboratory, Washington University in St. Louis, St. Louis, Missouri, USA.

Composite nanoparticles find application in catalysis, drug delivery, and energy storage and require increasingly fine control of their physical properties and composition. While composite nanoparticles have been widely synthesized and characterized, little work has systematically correlated the initial concentration of precursors and the final composition of flame synthesized composite nanoparticles. This relationship is explored in a diffusion flame aerosol reactor by coupling a scanning mobility particle sizer (SMPS) with an inductively coupled plasma optical emission spectrometer (ICP-OES). Read More

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http://dx.doi.org/10.1080/02786826.2016.1271110DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5395249PMC
December 2016
4 Reads

Revisiting the size selective performance of EPA's high-volume total suspended particulate matter (Hi-Vol TSP) sampler.

Aerosol Sci Technol 2017 Apr;51(7):868-878

US EPA, Research Triangle Park, North Carolina, USA.

Under the National Ambient Air Quality Standard (NAAQS) for airborne lead, measurements are conducted by means of a high-volume total suspended particulate matter (Hi-Vol TSP) sampler. In the decade between 1973 and 1983, there were 12 publications that explored the sampling characteristics and effectiveness of the Hi-Vol TSP, yet there persists uncertainty regarding its performance. This article presents an overview of the existing literature on the performance of the Hi-Vol TSP, and identifies the reported sampler effectiveness with respect to four factors: particle size (reported effectiveness of 7%-100%), wind speed (-36% to 100%), sampler orientation (7%-100%), and operational state (107%-140%). Read More

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http://dx.doi.org/10.1080/02786826.2017.1316358DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7001320PMC

Field Performance of a Novel Passive Bioaerosol Sampler using Polarized Ferroelectric Polymer Films.

Aerosol Sci Technol 2017 28;51(7):787-800. Epub 2017 Apr 28.

Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ.

Passive bioaerosol samplers can improve environmental and health protection by enhancing the practicality and cost-effectiveness of air sampling. Here, we present the outdoor field testing of a novel, passive bioaerosol sampler, the Rutgers Electrostatic Passive Sampler (REPS), based on the use of polarized, ferroelectric polymer film (poly(vinylidene fluoride)). Four 10-day-long field campaigns were conducted to compare total (culturable + non-culturable) and culturable bioaerosol collection efficiencies of REPS to passive samplers (PTFE settling filters and agar settling plates). Read More

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http://dx.doi.org/10.1080/02786826.2017.1316830DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377157PMC
April 2017
2 Reads

Design and Evaluation of an Aerodynamic Focusing Micro-Well Aerosol Collector.

Aerosol Sci Technol 2017 24;51(9):1016-1026. Epub 2017 May 24.

University of Washington, Mechanical Engineering, Box 352600, Seattle, WA 98195.

Aerosol sampling and identification is vital for the assessment and control of particulate matter pollution, airborne pathogens, allergens, and toxins and their effect on air quality, human health, and climate change. In-situ analysis of chemical and biological airborne components of aerosols on a conventional filter is challenging due to dilute samples in a large collection region. We present the design and evaluation of a micro-well (µ-well) aerosol collector for the assessment of airborne particulate matter (PM) in the 0. Read More

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http://dx.doi.org/10.1080/02786826.2017.1329515DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6368264PMC
May 2017
3 Reads

Preparation and characterization of polycaprolactone microspheres by electrospraying.

Aerosol Sci Technol 2016 11 13;50(11):1201-1215. Epub 2016 Sep 13.

Centre for Imaging Sciences, The University of Manchester, Manchester, United Kingdom; Bioxydyn Limited, Rutherford House, Manchester Science Park, Manchester, United Kingdom.

The ability to reproducibly produce and effectively collect electrosprayed polymeric microspheres with controlled morphology and size in bulk form is challenging. In this study, microparticles were produced by electrospraying polycaprolactone (PCL) of various molecular weights and solution concentrations in chloroform, and by collecting materials on different substrates. The resultant PCL microparticles were characterized by optical and electron microscopy to investigate the effect of molecular weight, solution concentration, applied voltage, working distance, and flow rate on their morphology and size. Read More

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http://dx.doi.org/10.1080/02786826.2016.1234707DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5111097PMC
November 2016
7 Reads

Miniature Differential Mobility Analyzer for Compact Field-Portable Spectrometers.

Aerosol Sci Technol 2016 2;50(11):1167-1179. Epub 2016 Sep 2.

Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1090 Tusculum Ave, MS: R7, Cincinnati, OH, 45226.

A low-flow miniature differential mobility analyzer (mDMA) has been developed for compact field-portable mobility spectrometers to classify the submicrometer aerosol. The mDMA was designed for an ultra-low aerosol flow rate of 0.05 L/min. Read More

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http://dx.doi.org/10.1080/02786826.2016.1230662DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5102281PMC
September 2016
12 Reads

A Granular Bed for Use in a Nanoparticle Respiratory Deposition Sampler.

Aerosol Sci Technol 2015;49(3):179-187. Epub 2015 Feb 3.

Department of Occupational and Environmental Health, University of Iowa, Iowa City, Iowa, USA.

A granular bed was designed to collect nanoparticles as an alternative to nylon mesh screens for use in a nanoparticle respiratory deposition (NRD) sampler. The granular bed consisted of five layers in series: a coarse mesh, a large-bead layer, a small-bead layer, a second large-bead layer, and a second coarse mesh. The bed was designed to primarily collect particles in the small-bead layer, with the coarse mesh and large-bead layers designed to hold the collection layer in position. Read More

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http://dx.doi.org/10.1080/02786826.2015.1013521DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756655PMC
February 2015
6 Reads

Evaluation of a Device for Intra-Pulmonary Aerosol Generation and Delivery.

Aerosol Sci Technol 2015 Sep 6;49(9):747-752. Epub 2015 Jul 6.

Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada; Division of Critical Care, Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota, USA.

For infants born with respiratory distress syndrome (RDS), liquid bolus delivery of surfactant administered through an endotracheal tube is common practice. While this method is generally effective, complications such as transient hypoxia, hypercapnia, and altered cerebral blood flow may occur. Aerosolized surfactant therapy has been explored as an alternative. Read More

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http://dx.doi.org/10.1080/02786826.2015.1067670DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4753072PMC
September 2015
3 Reads

Profile and Morphology of Fungal Aerosols Characterized by Field Emission Scanning Electron Microscopy (FESEM).

Aerosol Sci Technol 2015;49(6):423-435. Epub 2015 Apr 18.

National Institute of Occupational Health, Department of Chemical and Biological Work Environment, Oslo, Norway.

Fungal aerosols consist of spores and fragments with diverse array of morphologies; however, the size, shape, and origin of the constituents require further characterization. In this study, we characterize the profile of aerosols generated from , and grown for 8 weeks on gypsum boards. Fungal particles were aerosolized at 12 and 20 L min using the Fungal Spore Source Strength Tester (FSSST) and the Stami particle generator (SPG). Read More

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http://dx.doi.org/10.1080/02786826.2015.1040486DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4741100PMC
April 2015
17 Reads

Air sampling filtration media: Collection efficiency for respirable size-selective sampling.

Aerosol Sci Technol 2016 Jan 14;50(1):76-87. Epub 2015 Dec 14.

Health Effects Laboratory Division, Exposure Assessment Branch, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA.

The collection efficiencies of commonly used membrane air sampling filters in the ultrafine particle size range were investigated. Mixed cellulose ester (MCE; 0.45, 0. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4729392PMC
http://dx.doi.org/10.1080/02786826.2015.1128525DOI Listing
January 2016
22 Reads
1 Citation
2.413 Impact Factor

A Real-Time Fast-Flow Tube Study of VOC and Particulate Emissions from Electronic, Potentially Reduced-Harm, Conventional, and Reference Cigarettes.

Aerosol Sci Technol 2015;49(9):816-827

Department of Epidemiology, University of California, Irvine, California, USA.

Tobacco-free electronic cigarettes (e-cigarettes), which are currently not regulated by the FDA, have become widespread as a "safe" form of smoking. One approach to evaluate the potential toxicity of e-cigarettes and other types of potentially "reduced-harm" cigarettes is to compare their emissions of volatile organic compounds (VOCs), including reactive organic electrophillic compounds such as acrolein, and particulate matter to those of conventional and reference cigarettes. Our newly designed fast-flow tube system enabled us to analyze VOC composition and particle number concentration in real-time by promptly diluting puffs of mainstream smoke obtained from different brands of combustion cigarettes and e-cigarettes. Read More

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http://dx.doi.org/10.1080/02786826.2015.1076156DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4696598PMC
January 2015
9 Reads

Evaluation of the Alphasense Optical Particle Counter (OPC-N2) and the Grimm Portable Aerosol Spectrometer (PAS-1.108).

Aerosol Sci Technol 2016 7;50(12):1352-1365. Epub 2016 Sep 7.

Department of Occupational and Environmental Health, University of Iowa, Iowa City, Iowa, USA.

We compared the performance of a low-cost (∼$500), compact optical particle counter (OPC, OPC-N2, Alphasense) to another OPC (PAS-1.108, Grimm Technologies) and reference instruments. We measured the detection efficiency of the OPCs by size from 0. Read More

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http://dx.doi.org/10.1080/02786826.2016.1232859DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5580936PMC
September 2016
9 Reads

Porous Polyurethane Foam for Use as a Particle Collection Substrate in a Nanoparticle Respiratory Deposition Sampler.

Aerosol Sci Technol 2016 16;50(5):497-506. Epub 2016 Mar 16.

Department of Occupational and Environmental Health, University of Iowa.

Porous polyurethane foam was evaluated to replace the eight nylon meshes used as a substrate to collect nanoparticles in the Nanoparticle Respiratory Deposition (NRD) sampler. Cylindrical (25-mm diameter by 40-mm deep) foam with 110 pores per inch was housed in a 25-mm-diameter conductive polypropylene cassette cowl compatible with the NRD sampler. Pristine foam and nylon meshes were evaluated for metals content via elemental analysis. Read More

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http://dx.doi.org/10.1080/02786826.2016.1164828DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5580938PMC
March 2016
6 Reads

Inter-comparison of Low-cost Sensors for Measuring the Mass Concentration of Occupational Aerosols.

Aerosol Sci Technol 2016 10;50(5):462-473. Epub 2016 Mar 10.

Department of Occupational and Environmental Health, University of Iowa, Iowa City, Iowa, USA.

Low-cost sensors are effective for measuring the mass concentration of ambient aerosols and secondhand smoke in homes, but their use at concentrations relevant to occupational settings has not been demonstrated. We measured the concentrations of four aerosols (salt, Arizona road dust, welding fume, and diesel exhaust) with three types of low-cost sensors (a DC1700 from Dylos and two commodity sensors from Sharp), an aerosol photometer, and reference instruments at concentrations up to 6500 μg/m. Raw output was used to assess sensor precision and develop equations to compute mass concentrations. Read More

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http://dx.doi.org/10.1080/02786826.2016.1162901DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5580827PMC
March 2016
21 Reads

Practical Limitations of Aerosol Separation by a Tandem Differential Mobility Analyzer-Aerosol Particle Mass Analyzer.

Aerosol Sci Technol 2016 4;50(2):160-172. Epub 2016 Jan 4.

Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899, USA.

A cavity ring-down spectrometer and condensation particle counter were used to investigate the limitations in the separation of singly and multiply charged aerosol particles by a tandem differential mobility analyzer (DMA) and aerosol particle mass analyzer (APM). The impact of particle polydispersity and morphology was investigated using three materials: nearly-monodisperse polystyrene latex nanospheres (PSL); polydisperse, nearly-spherical ammonium sulfate (AS) and polydisperse lacey fractal soot agglomerates. PSL and AS particles were easily resolved as a function of charge. Read More

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http://dx.doi.org/10.1080/02786826.2015.1136733DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5486234PMC
January 2016
6 Reads

Application of direct-reading and elemental carbon analysis methods to measure mass-based penetration of carbon nanotubes through elastomeric half-face and filtering facepiece respirators.

Aerosol Sci Technol 2016 22;50(10):1044-1054. Epub 2016 Jul 22.

National Institute for Occupational Safety and Health, Division of Applied Research and Technology, Cincinnati, Ohio, USA.

The aim of this study was to apply a direct-reading aerosol instrument method and an elemental carbon (EC) analysis method to measure the mass-based penetration of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) through elastomeric half-mask respirators (EHRs) and filtering facepiece respirators (FFRs). For the direct-reading aerosol instrument method, two scanning mobility particle sizer/aerodynamic particle sizer systems were used to simultaneously determine the upstream (outside respirator) and downstream (inside respirator) test aerosols. For the EC analysis method, upstream and downstream CNTs were collected on filter cassettes and then analyzed using a thermal-optical technique. Read More

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http://dx.doi.org/10.1080/02786826.2016.1216519DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5464732PMC
July 2016
16 Reads

Development of Portable Aerosol Mobility Spectrometer for Personal and Mobile Aerosol Measurement.

Aerosol Sci Technol 2016 2;50(11):1167-1179. Epub 2016 Sep 2.

Kanomax Japan Inc., Osaka, Japan.

We describe development of a Portable Aerosol Mobility Spectrometer (PAMS) for size distribution measurement of submicrometer aerosol. The spectrometer is designed for use in personal or mobile aerosol characterization studies and measures approximately 22.5 × 22. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5389461PMC
September 2016
6 Reads

A toxicology suite adapted for comparing parallel toxicity responses of model human lung cells to diesel exhaust particles and their extracts.

Aerosol Sci Technol 2015;49(8):599-610

Biology Department, Columbia Gorge Community College, The Dalles, Oregon, USA.

Epidemiological studies have shown that exposure to airborne particulate matter can be an important risk factor for some common respiratory diseases. While many studies have shown that particulate matter exposures are associated with inflammatory reactions, the role of specific cellular responses in the manifestation of primary hypersensitivities, and the progression of respiratory diseases remains unclear. In order to better understand mechanisms by which particulate matter can exert adverse health effects, more robust approaches to support studies are warranted. Read More

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http://dx.doi.org/10.1080/02786826.2015.1053559DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4583370PMC
January 2015
7 Reads

An Method for Sizing Insoluble Residues in Precipitation and Other Aqueous Samples.

Aerosol Sci Technol 2015 Jan;49(1):24-34

Department of Environmental Health Sciences, University of Michigan, Ann Arbor, Michigan, USA ; Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA.

Particles are frequently incorporated into clouds or precipitation, influencing climate by acting as cloud condensation or ice nuclei, taking up coatings during cloud processing, and removing species through wet deposition. Many of these particles, particularly ice nuclei, can remain suspended within cloud droplets/crystals as insoluble residues. While previous studies have measured the soluble or bulk mass of species within clouds and precipitation, no studies to date have determined the number concentration and size distribution of insoluble residues in precipitation or cloud water using in situ methods. Read More

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http://dx.doi.org/10.1080/02786826.2014.991439DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4333727PMC
January 2015
29 Reads

Physicochemical Characterization of Simulated Welding Fume from a Spark Discharge System.

Aerosol Sci Technol 2014 Jul;47(7):768-776

Department of Occupational and Environmental Health, University of Iowa, Iowa, USA ; Interdisciplinary Graduate Program in Human Toxicology, University of Iowa, Iowa, USA.

This study introduces spark discharge system (SDS) as a way to simulate welding fumes. The SDS was developed using welding rods as electrodes with an optional coagulation chamber. The size, morphology, composition, and concentration of the fume produced and the concentration of ozone (O) and nitrogen oxides (NO) were characterized. Read More

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http://dx.doi.org/10.1080/02786826.2014.925536DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119574PMC
July 2014
24 Reads

Design and Laboratory Evaluation of a Sequential Spot Sampler for Time-Resolved Measurement of Airborne Particle Composition.

Aerosol Sci Technol 2014 Jan;48(6):655-663

Aerosol Dynamics Inc., Berkeley, California, USA.

A new sampling approach has been developed to enable affordable, time-resolved monitoring of particulate chemical compositions, and more generally to provide concentrated samples of airborne particles. Using a newly developed, moderated water-based condensational growth technology, individual particle samples are deposited in a 1-mm diameter dry "spot". The moderated condensation technology enables this collection with minimal temperature rise, providing robust collection for volatile constituents. Read More

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http://dx.doi.org/10.1080/02786826.2014.911409DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4097308PMC
January 2014
7 Reads

Targeted Lung Delivery of Nasally Administered Aerosols.

Aerosol Sci Technol 2014 ;48(4):434-449

Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, Virginia, USA ; Department of Pharmaceutics, Virginia Commonwealth University, Richmond, Virginia, USA.

Using the nasal route to deliver pharmaceutical aerosols to the lungs has a number of advantages including co-administration during non-invasive ventilation. The objective of this study was to evaluate the growth and deposition characteristics of nasally administered aerosol throughout the conducting airways based on delivery with streamlined interfaces implementing two forms of controlled condensational growth technology. Characteristic conducting airways were considered including a nose-mouth-throat (NMT) geometry, complete upper tracheobronchial (TB) model through the third bifurcation (B3), and stochastic individual path (SIP) model to the terminal bronchioles (B15). Read More

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http://dx.doi.org/10.1080/02786826.2014.887829DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4051279PMC
January 2014
13 Reads

Moderated, Water-Based, Condensational Particle Growth in a Laminar Flow.

Aerosol Sci Technol 2014 Jan;48(4):401-408

Aerosol Dynamics Inc., Berkeley, California, USA.

Presented is a new approach for laminar-flow water condensation that produces saturations above 1.5 while maintaining temperatures of less than 30°C in the majority of the flow and providing an exiting dew point below 15°C. With the original laminar flow water condensation method, the particle activation and growth occurs in a region with warm, wetted walls throughout, which has the side-effect of heating the flow. Read More

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http://dx.doi.org/10.1080/02786826.2014.881460DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4019444PMC
January 2014
5 Reads

LABORATORY EVALUATION OF A MICROFLUIDIC ELECTROCHEMICAL SENSOR FOR AEROSOL OXIDATIVE LOAD.

Aerosol Sci Technol 2014 May;48(5):489-497

Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado, USA.

Human exposure to particulate matter (PM) air pollution is associated with human morbidity and mortality. The mechanisms by which PM impacts human health are unresolved, but evidence suggests that PM intake leads to cellular oxidative stress through the generation of reactive oxygen species (ROS). Therefore, reliable tools are needed for estimating the oxidant generating capacity, or oxidative load, of PM at high temporal resolution (minutes to hours). Read More

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http://dx.doi.org/10.1080/02786826.2014.891722DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3975820PMC
May 2014
10 Reads

Minimizing Concentration Effects in Water-Based, Laminar-Flow Condensation Particle Counters.

Aerosol Sci Technol 2013 ;47(6):645-654

Aerosol Dynamics Inc., Berkeley, California, USA.

Concentration effects in water condensation systems, such as used in the water-based condensation particle counter, are explored through numeric modeling and direct measurements. Modeling shows that the condensation heat release and vapor depletion associated with particle activation and growth lowers the peak supersaturation. At higher number concentrations, the diameter of the droplets formed is smaller, and the threshold particle size for activation is higher. Read More

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http://dx.doi.org/10.1080/02786826.2013.779629DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3890109PMC
January 2013
20 Reads

Size Distribution and Estimated Respiratory Deposition of Total Chromium, Hexavalent Chromium, Manganese, and Nickel in Gas Metal Arc Welding Fume Aerosols.

Aerosol Sci Technol 2014;48(12):1254-1263. Epub 2014 Nov 4.

Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA.

A laboratory study was conducted to determine the mass of total Cr, Cr(VI), Mn, and Ni in 15 size fractions for mild and stainless steel gas-metal arc welding (GMAW) fumes. Samples were collected using a nano multi orifice uniform deposition impactor (MOUDI) with polyvinyl chloride filters on each stage. The filters were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) and ion chromatography. Read More

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http://dx.doi.org/10.1080/02786826.2014.980883DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4736724PMC
November 2014
13 Reads

Numerical Investigation of Sheath and Aerosol Flows in the Flow Combination Section of a Baron Fiber Classifier.

Aerosol Sci Technol 2014;48(8):896-905

Chemical Exposure and Monitoring Branch (CEMB), Division of Applied Research and Technology (DART), National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), 4676 Columbia Parkway, Cincinnati, Ohio 45226.

The Baron fiber classifier is an instrument used to separate fibers by length. The flow combination section (FCS) of this instrument is an upstream annular region, where an aerosol of uncharged fibers is introduced along with two sheath flows; length separation occurs by dielectrophoresis downstream in the flow classification section. In its current implementation at NIOSH, the instrument is capable of processing only very small quantities of fibers. Read More

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http://dx.doi.org/10.1080/02786826.2014.936342DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4573894PMC
January 2014
10 Reads
2.413 Impact Factor

Optimization approaches to ameliorate humidity and vibration related issues using the microAeth black carbon monitor for personal exposure measurement.

Aerosol Sci Technol 2013 Nov;47(11):1196-1204

Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA.

Exposure to ambient black carbon (BC) is associated with adverse health effects. Black carbon levels display large spatial and temporal variability in many settings, such as cities and rural households where fossil fuel and biomass, respectively, are commonly burned for transportation, heat and cooking. This paper addresses the optimization of the miniaturized personal BC monitor, the microAeth® for use in epidemiology studies. Read More

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http://dx.doi.org/10.1080/02786826.2013.829551DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4280504PMC
November 2013
44 Reads

Arsenic removal from water using flame-synthesized iron oxide nanoparticles with variable oxidation states.

Aerosol Sci Technol 2013 Feb;47(2):169-176

Department of Mechanical and Aerospace Engineering, University of California Davis, One Shields Avenue, Davis, California 95616, U.S.A.

We utilized gas-phase diffusion flame synthesis, which has potential for large-scale production of metal oxide nanoparticles, to produce iron oxide nanoparticles (IONPs) with variable oxidation states. The efficacy of these materials in removal of arsenate (As(V) ) from water was assessed. Two different flame configurations, a diffusion flame (DF) and an inverse diffusion flame (IDF), were employed to synthesize six different IONPs by controlling flame conditions. Read More

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http://dx.doi.org/10.1080/02786826.2012.735380DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3640798PMC
February 2013
9 Reads

Development and Performance Evaluation of an Exhaled-Breath Bioaerosol Collector for Influenza Virus.

Aerosol Sci Technol 2013 Jan 25;47(4):444-451. Epub 2013 Jan 25.

The importance of the aerosol mode for transmission of influenza is unknown. Understanding the role of aerosols is essential to developing public health interventions such as the use of surgical masks as a source control to prevent the release of infectious aerosols. Little information is available on the number and size of particles generated by infected persons, which is partly due to the limitations of conventional air samplers, which do not efficiently capture fine particles or maintain microorganism viability. Read More

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http://dx.doi.org/10.1080/02786826.2012.762973DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3570155PMC
January 2013
9 Reads

Effect of Particle Size on the Performance of an N95 Filtering Facepiece Respirator and a Surgical Mask at Various Breathing Conditions.

Aerosol Sci Technol 2013 20;47(11):1180-1187. Epub 2013 Aug 20.

Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, Cincinnati, OH.

The effect of aerosol particle size on the performance of an N95 filtering facepiece respirator (FFR) and a surgical mask (SM) was evaluated under different breathing conditions, including breathing frequency and mean inspiratory flow (MIF) rate. The FFR and SM were sealed on a manikin headform and challenged with charge-equilibrated NaCl aerosol. Filter penetration (P) was determined as the ratio of aerosol concentrations inside and outside the FFR/SM size-selectively (28 channels) within a range of 20 to 500 nm. Read More

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http://dx.doi.org/10.1080/02786826.2013.829209DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6756464PMC