Nanoparticle Mass Spectrometry: Pushing the Limit of Single Particle Analysis

Johnston, Murray V.; Wang, Shenyi; Reinard, Melissa S.

doi:10.1366/000370206778664671

Cited by 20 publications

(23 citation statements)

References 53 publications

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“…This method becomes less effective as the particle size increases because the particle kinetic energy grows too large to handle with electrostatics or electrodynamic alone. 103 Instead, a so-called aerodynamic lens (ADL) developed by McMurry et al, 155 tends to be more effective for particles at the higher end of the nanometre size range. Generally, ADL consists of a 100 mm flow limiting orifice attached to a 1 cm inner diameter, 30 cm long tube.…”

Section: On-line Bulk Sampling and Analysis Methodsmentioning

confidence: 99%

JEM Spotlight: Environmental monitoring of airborne nanoparticles

et al. 2009

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The aim of this work was to review the existing instrumental methods to monitor airborne nanoparticles in different types of indoor and outdoor environments in order to detect their presence and to characterise their properties. Firstly the terminology and definitions used in this field are discussed, which is followed by a review of the methods to measure particle physical characteristics including number, concentration, size distribution and surface area. An extensive discussion is provided on the direct methods for particle elemental composition measurements, as well as on indirect methods providing information on particle volatility and solubility, and thus in turn on volatile and semivolatile compounds of which the particle is composed. A brief summary of broader considerations related to nanoparticle monitoring in different environments concludes the paper.

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Section: On-line Bulk Sampling and Analysis Methodsmentioning

confidence: 99%

JEM Spotlight: Environmental monitoring of airborne nanoparticles

et al. 2009

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“…Several operationally defined particle sizes are used in atmospheric science ( Johnston et al 2006), and it is not generally obvious which agrees best with the diameters measured in microscopes. Images are usually two-dimensional (2D) projections, so information on the third dimension of the particle is lost.…”

Section: Size and Morphologymentioning

confidence: 99%

Nature and Climate Effects of Individual Tropospheric Aerosol Particles

Pósfai

Buseck

2010

Annu. Rev. Earth Planet. Sci.

200

171

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Aerosol particles in the atmosphere exert a strong influence on climate by interacting with sunlight and by initiating cloud formation. Because the tropospheric aerosol is a heterogeneous mixture of various particle types, its climate effects can only be fully understood through detailed knowledge of the physical and chemical properties of individual particles. Here we review the results of individual-particle studies that use microscopy-based techniques, emphasizing transmission electron microscopy and focusing on achievements of the past ten years. We discuss the techniques that are best suited for studying distinct particle properties and provide a brief overview of major particle types, their identification, and their sources. The majority of this review is concerned with the optical properties and hygroscopic behavior of aerosol particles; we discuss recent results and highlight the potential of emerging microscopy techniques for analyzing the particle properties that contribute most to climate effects.

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“…A range of mass spectrometers using various particle vaporization and ionization techniques have been developed. The most common designs include thermal desorption followed by electron ionization [24, 25] or other types of ionization [26, 27] and laser ablation [28, 29]. Instruments based on thermal desorption are mainly configured for determining ensemble particle properties averaged over defined time periods, whereas the laser-based instruments are primarily used for single-particle measurements.…”

Section: Introductionmentioning

confidence: 99%

Understanding atmospheric organic aerosols via factor analysis of aerosol mass spectrometry: a review

et al. 2011

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Organic species are an important but poorly characterized constituent of airborne particulate matter. A quantitative understanding of the organic fraction of particles (organic aerosol, OA) is necessary to reduce some of the largest uncertainties that confound the assessment of the radiative forcing of climate and air quality management policies. In recent years, aerosol mass spectrometry has been increasingly relied upon for highly time-resolved characterization of OA chemistry and for elucidation of aerosol sources and lifecycle processes. Aerodyne aerosol mass spectrometers (AMS) are particularly widely used, because of their ability to quantitatively characterize the size-resolved composition of submicron particles (PM1). AMS report the bulk composition and temporal variations of OA in the form of ensemble mass spectra (MS) acquired over short time intervals. Because each MS represents the linear superposition of the spectra of individual components weighed by their concentrations, multivariate factor analysis of the MS matrix has proved effective at retrieving OA factors that offer a quantitative and simplified description of the thousands of individual organic species. The sum of the factors accounts for nearly 100% of the OA mass and each individual factor typically corresponds to a large group of OA constituents with similar chemical composition and temporal behavior that are characteristic of different sources and/or atmospheric processes. The application of this technique in aerosol mass spectrometry has grown rapidly in the last six years. Here we review multivariate factor analysis techniques applied to AMS and other aerosol mass spectrometers, and summarize key findings from field observations. Results that provide valuable information about aerosol sources and, in particular, secondary OA evolution on regional and global scales are highlighted. Advanced methods, for example a-priori constraints on factor mass spectra and the application of factor analysis to combined aerosol and gas phase data are discussed. Integrated analysis of worldwide OA factors is used to present a holistic regional and global description of OA. Finally, different ways in which OA factors can constrain global and regional models are discussed.

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Nanoparticle Mass Spectrometry: Pushing the Limit of Single Particle Analysis

Cited by 20 publications

References 53 publications

JEM Spotlight: Environmental monitoring of airborne nanoparticles

JEM Spotlight: Environmental monitoring of airborne nanoparticles

Nature and Climate Effects of Individual Tropospheric Aerosol Particles

Understanding atmospheric organic aerosols via factor analysis of aerosol mass spectrometry: a review

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