Field study of a soft X-ray aerosol neutralizer combined with electrostatic classifiers for nanoparticle size distribution measurements

Nicosia, Alessia; Manodori, Laura; Trentini, Arianna; Ricciardelli, Isabella; Bacco, Dimitri; Poluzzi, Vanes; Matteo, L. Di; Belosi, Franco

doi:10.1016/j.partic.2017.08.001

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…Other work showed a good correlation in the particle number concentration and differences in the count median diameter and geometric standard deviation below 4% for a polydisperse NaCl aerosol measured with GRIMM SMPS equipped with either an X-ray source (TSI RX 3087) or a radioactive source (Nicosia et al, 2014). The results from Nicosia et al (2018) confirmed that instrumental uncertainties introduced by the use of the X-ray sources rather than a radioactive neutralizer in the size range 10-300 nm are negligible, in line with previous work published by Kallinger et al (2012).…”

Section: Experimental Setup and Smps Typesmentioning

confidence: 82%

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

et al. 2020

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An intercomparison exercise of good laboratory practices for nanoaerosols size measurements by mobility spectrometersAn intercomparison campaign on nanoparticle size measurement was organized in the frame of the French nanoMetrology club. The aim of this study is to make an inventory of the metrological capabilities of all measurement techniques in France involved in the "nano" size range, including the SMPS (Scanning Mobility Particle Sizer) concerning aerosol metrology. For this study, four samples have been proposed, namely (1) -a SiO 2 colloidal suspension (FD304) consisting of a monomodal population, (2)two samples consisting of two nanoparticle populations of SiO 2 having proportions to be determined and(3) -a TiO 2 colloidal suspension. Ten SMPS associated to five participants around a common experimental setup were performed in link with a control SMPS to have simultaneous measurement s with a same instrument in each laboratory in parallel with the SMPS used by each partner. This article presents SMPS results of this study associated with the description of the experimental set -up and the sample preparation protocol with an identified schedule and comparison with SEM measurements. The present paper does not focus on the actual capability of the tested mobility spectrometers, but aims to highlight s the good laboratory practices using their own but common resources in terms of aerosol generation and measurement set-ups.

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Section: Experimental Setup and Smps Typesmentioning

confidence: 82%

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

et al. 2020

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“…It is worth noting that the elementary charge of each particle is assumed to be equal to 1. This assumption is based on the fact that in this study the particles with the diameter smaller than 50 nm are primarily capable of acquiring a single charge within the aerosol neutralizer [37,38].…”

Section: Discussionmentioning

confidence: 99%

Investigation into Detection Efficiency Deviations in Aviation Soot and Calibration Particles Based on Condensation Particle Counting

Chen,

Zhou,

et al. 2024

Symmetry

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Aviation soot constitutes a significant threat to human well-being, underscoring the critical importance of accurate measurements. The condensation particle counter (CPC) is the primary instrument for quantifying aviation soot, with detection efficiency being a crucial parameter. The properties of small particles and the symmetry of their growth pathways are closely related to the detection efficiency of the CPC. In laboratory environments, sodium chloride is conventionally utilized to calibrate the CPC’s detection efficiency. However, aviation soot exhibits distinctive morphological characteristics compared to the calibration particles, leading to detection efficiencies obtained from calibration particles that may not be applicable to aviation soot. To address this issue, a quantitative study was performed to explore the detection efficiency deviations between aviation soot and calibration particles. The experiment initially utilized a differential mobility analyzer to size select the two types of polydisperse particles into monodisperse particles. Subsequently, measurements of the separated particles were performed using the TSI Corporation’s aerosol electrometer and a rigorously validated CPC (BH-CPC). These allowed for determining the detection efficiency deviation in the BH-CPC for the two types of particles at different particle sizes. Furthermore, the influence of the operating temperature of the BH-CPC on this detection efficiency deviation was investigated. The experimental results indicate a significant detection efficiency deviation between aviation soot and sodium chloride. In the range of 10–40 nm, the absolute detection efficiency deviation can reach a maximum of 0.15, and the relative deviation can reach a maximum of 0.75. And this detection efficiency deviation can be reduced by establishing a relevant relationship between the detection efficiency of the operating temperature and the calibration temperature. Compared to the saturated segment calibration temperature of 50 °C, the aviation soot detection efficiency is closer to the sodium chloride detection efficiency at the calibration temperature of 50 °C when the saturated segment operates at a temperature of 45 °C. These studies provide crucial theoretical guidance for enhancing the precision of aviation soot emission detection and establish a foundation for future research in monitoring and controlling soot emissions within the aviation sector.

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“…5522). Nicosia et al [ 24 ], applied a TSI soft X-Ray neutralizer to the Grimm L-DMA column obtaining a transfer function to correct the data. The SMPS scan time was ca 4.5 min with a 1.5 min retrace time.…”

Section: Methodsmentioning

confidence: 99%

Particles Emission from an Industrial Spray Coating Process Using Nano-Materials

et al. 2022

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Industrial spray coating processes are known to produce excellent coatings on large surfaces and are thus often used for in-line production. However, they could be one of the most critical sources of worker exposure to ultrafine particles (UFPs). A monitoring campaign at the Witek s.r.l. (Florence, Italy) was deployed to characterize the release of TiO2 NPs doped with nitrogen (TiO2-N) and Ag capped with hydroxyethyl cellulose (AgHEC) during automatic industrial spray-coating of polymethyl methacrylate (PMMA) and polyester. Aerosol particles were characterized inside the spray chamber at near field (NF) and far field (FF) locations using on-line and off-line instruments. Results showed that TiO2-N suspension produced higher particle number concentrations than AgHEC in the size range 0.3–1 µm (on average 1.9 102 p/cm3 and 2.5 101 p/cm3, respectively) after background removing. At FF, especially at worst case scenario (4 nozzles, 800 mL/min flow rate) for TiO2-N, the spray spikes were correlated with NF, with an observed time lag of 1 minute corresponding to a diffusion speed of 0.1 m/s. The averaged ratio between particles mass concentrations in the NF position and inside the spray chamber was 1.7% and 1.5% for TiO2-N and for AgHEC suspensions, respectively. The released particles’ number concentration of TiO2-N in the size particles range 0.3–1 µm was comparable for both PMMA and polyester substrates, about 1.5 and 1.6 102 p/cm3. In the size range 0.01–30 µm, the aerosol number concentration at NF for both suspensions was lower than the nano reference values (NRVs) of 16·103 p/cm-3.

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Field study of a soft X-ray aerosol neutralizer combined with electrostatic classifiers for nanoparticle size distribution measurements

Cited by 9 publications

References 35 publications

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

Investigation into Detection Efficiency Deviations in Aviation Soot and Calibration Particles Based on Condensation Particle Counting

Particles Emission from an Industrial Spray Coating Process Using Nano-Materials

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