Airborne nanoparticle characterization with a digital ion trap–reflectron time of flight mass spectrometer

Wang, Shenyi; Johnston, Murray V.

doi:10.1016/j.ijms.2006.07.001

Cited by 59 publications

(47 citation statements)

References 14 publications

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“…Nanoparticle composition was measured by two complementary methods. The first is the Nano Aerosol Mass Spectrometer (NAMS), which gives quantitative elemental composition of individual nanoparticles in the 10–30 nm size range [ Pennington and Johnston , ; Wang and Johnston , ; Wang et al ., ]. For this campaign, NAMS was set to analyze the composition of 18 ± 3 nm mobility diameter particles.…”

Section: Methodsmentioning

confidence: 99%

Molecular constraints on particle growth during new particle formation

Bzdek

Lawler

Horan

et al. 2014

Geophysical Research Letters

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Atmospheric new particle formation (NPF) produces large numbers of nanoparticles which can ultimately impact climate. A firm understanding of the identity and contribution of the inorganic and carbonaceous species to nanoparticle growth is required to assess the climatic importance of NPF. Here, we combine elemental and molecular nanoparticle composition measurements to better define the composition and contribution of carbonaceous matter to nanoparticle growth in a rural/coastal environment. We show that carbonaceous matter can account for more than half of the mass growth of nanoparticles and its composition is consistent with that expected for extremely low volatility organic compounds. An important novel finding is that the carbonaceous matter must contain a substantial amount of nitrogen, whose molecular identity is not fully understood. The results advance our quantitative understanding of the composition and contribution of carbonaceous matter to nanoparticle growth, which is essential to more accurately predict the climatic impacts of NPF.

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Section: Methodsmentioning

confidence: 99%

Molecular constraints on particle growth during new particle formation

Bzdek

Lawler

Horan

et al. 2014

Geophysical Research Letters

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“…130,137,138 The NAMS consists of an aerodynamic inlet, a quadruple ion guide, a quadruple ion trap and a time-of-flight mass analyser. Charged particles in the aerosol are drawn through the aerodynamic inlet, focused through the ion guide and captured in the ion trap.…”

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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“…Aerosol mass spectrometer (AMS) can measure particles with diameters down to ∼ 40 nm (Jayne et al, 2000 and updated references on http://cires.colorado.edu/jimenez/ ams-papers.html). Thermal desorption chemical ionization mass spectrometer (TDCIMS; Smith et al, 2004) and nano aerosol mass spectrometer (NAMS; Wang and Johnston, 2006) are commonly used at 10-30 nm particles. Analysis of molecular clusters with diameter up to ∼ 1 nm has been achieved by cluster chemical ionization mass spectrometer (Cluster-CIMS; Zhao et al, 2010;Jiang et al, 2011a) and chemical ionization with the atmospheric pressure interface time-of-flight mass spectrometer (CI-APi-TOF; Jokinen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Scanning supersaturation condensation particle counter applied as a nano-CCN counter for size-resolved analysis of the hygroscopicity and chemical composition of nanoparticles

Wang

et al. 2015

Atmos. Meas. Tech.

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Abstract. Knowledge about the chemical composition of aerosol particles is essential to understand their formation and evolution in the atmosphere. Due to analytical limitations, however, relatively little information is available for sub-10 nm particles. We present the design of a nano-cloud condensation nuclei counter (nano-CCNC) for measuring size-resolved hygroscopicity and inferring chemical composition of sub-10 nm aerosol particles. We extend the use of counting efficiency spectra from a water-based condensation particle counter (CPC) and link it to the analysis of CCN activation spectra, which provides a theoretical basis for the application of a scanning supersaturation CPC (SS-CPC) as a nano-CCNC. Measurement procedures and data analysis methods are demonstrated through laboratory experiments with monodisperse particles of diameter down to 2.5 nm, where sodium chloride, ammonium sulfate, sucrose and tungsten oxide can be easily discriminated by different characteristic supersaturations of water droplet formation. A near-linear relationship between hygroscopicity parameter κ and organic mass fraction is also found for sucroseammonium sulfate mixtures. The design is not limited to the water CPC, but also applies to CPCs with other working fluids (e.g. butanol, perfluorotributylamine). We suggest that a combination of SS-CPCs with multiple working fluids may provide further insight into the chemical composition of nanoparticles and the role of organic and inorganic compounds in the initial steps of atmospheric new particle formation and growth.

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Airborne nanoparticle characterization with a digital ion trap–reflectron time of flight mass spectrometer

Cited by 59 publications

References 14 publications

Molecular constraints on particle growth during new particle formation

Molecular constraints on particle growth during new particle formation

JEM Spotlight: Environmental monitoring of airborne nanoparticles

Scanning supersaturation condensation particle counter applied as a nano-CCN counter for size-resolved analysis of the hygroscopicity and chemical composition of nanoparticles

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