A study on effects of size and structure on hygroscopicity of nanoparticles using a tandem differential mobility analyzer and TEM

Park, Kihong; Kim, Jaeseok; Miller, Arthur L.

doi:10.1007/s11051-008-9462-4

Cited by 63 publications

(73 citation statements)

References 23 publications

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“…The hygroscopic growth factors for particles with diameters of 13, 25, 50, 100, and 200 nm are used for analysis in this study. The hygroscopicity parameter κ for a certain size of particles at the corresponding time of a day can be calculated by Petters and Kreidenweis, 2007) …”

Section: Estimates Of Hygroscopicity Parameter Water Content Of Nanomentioning

confidence: 99%

“…The growth factor (f ) and water volume ratio (φ) of particles at elevated heights within the boundary layer can be estimated using Eqs. (2) and (3) (Petters and Kreidenweis, 2007;Kreidenweis et al, 2008), assuming that the boundary layer is well mixed so that particles at elevated heights have the same κ as particles measured at ground level:…”

Section: Estimates Of Hygroscopicity Parameter Water Content Of Nanomentioning

confidence: 99%

“…(2), but only the lower one is at a stable state. When RH is lower than 100 %, there is only one solution of f for f > 1 (Seinfeld and Pandis, 2006;Petters and Kreidenweis, 2007). While the surface tension of water, 0.072 J m −2 , was used in Eqs.…”

Section: Estimates Of Hygroscopicity Parameter Water Content Of Nanomentioning

confidence: 99%

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Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site

et al. 2018

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Abstract. Most prior field studies of new particle formation (NPF) have been performed at or near ground level, leaving many unanswered questions regarding the vertical extent of NPF. To address this, we measured concentrations of 11-16 nm diameter particles from ground level to 1000 m during the 2013 New Particle Formation Study at the Atmospheric Radiation Measurement Southern Great Plains site in Lamont, Oklahoma. The measurements were performed using a tethered balloon carrying two condensation particle counters that were configured for two different particle cut-off diameters. These observations were compared to data from three scanning mobility particle sizers at the ground level. We observed that 11-16 nm diameter particles were generated at the top region of the boundary layer, and were then rapidly mixed throughout the boundary layer. We also estimate liquid water content of nanoparticles using ground-based measurements of particle hygroscopicity obtained with a Humidified Tandem Differential Mobility Analyzer and vertically resolved relative humidity (RH) and temperature measured with a Raman lidar. Our analyses of these observations lead to the following conclusions regarding nanoparticles formed during NPF events at this site: (1) ground-based observations may not always accurately represent the timing, distribution, and meteorological conditions associated with the onset of NPF; (2) nanoparticles are highly hygroscopic and typically contain up to 50 % water by volume, and during conditions of high RH combined with high particle hygroscopicity, particles can be up to 95 % water by volume; (3) increased liquid water content of nanoparticles at high RH greatly enhances the partitioning of water-soluble species like organic acids into ambient nanoparticles.

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Section: Estimates Of Hygroscopicity Parameter Water Content Of Nanomentioning

confidence: 99%

Section: Estimates Of Hygroscopicity Parameter Water Content Of Nanomentioning

confidence: 99%

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Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site

et al. 2018

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“…Chen (2005) Qu et al (Park et al, 2009). But laboratory experiments show that they never reach crystallization point, even at 8% RH (Dougle et al, 1998).…”

Section: Interpretation Of the Resultsmentioning

confidence: 99%

Transverse approach between tunnel environment and corrosion: Particulate matter in the Grand Mare tunnel

Ameur-Boudabbous

Kasperek

Barbier

et al. 2014

Journal of the Air & Waste Management Association

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A tunnel-type semi-enclosed atmosphere is characterized by a higher particulate pollution than urban zones and highlights the particulate species having an impact on material degradation. Therefore, a transverse approach between air composition and its consequences upon longevity of materials is necessary, requiring a better knowledge of tunnel atmosphere and a better understanding of material degradation inside a tunnel for operating administration. The characterization of particulate matter collected inside a road tunnel in Rouen (France) allows us to set up the features of the particle characteristics of the real conditions of field exposure. Two sampling campaigns include analyses of organic and water-soluble ionic fractions. The current work shows that organic species, grouped into two sets derived primarily from engine exhaust and debris with wear particles resuspended by the traffic, are divided into two groups: a majority comprising n-alkanes, alkanoic acids, phthalates, ketones, and benzothiazole and a minority one composed of BTEX (benzene, toluene, ethylbenzene, and xylenes), polycyclic aromatic hydrocarbons (PAHs), fatty acid methyl esters (FAMEs), furans, phenols, and alkenes. As regards the water-soluble ionic fraction, the ionic species such as Cl, and Na þ are involved in the degradation process. The inorganic particles (insoluble and slightly soluble), debris and wear particles, organic acids, and relative humidity play a key role and are important factors to consider in the degradation process.Implications: Particles, together with relative humidity, can play an important role in the degradation of materials inside a road tunnel. Depth knowledge of the environment prevailing inside a tunnel improves the criteria for selection of materials of equipments contained therein. In the present study, it appears that the particulate mass can be divided into two groups with distinct effects: a water-soluble particle group is the source of ionic species involved in the degradation process, and a slightly water-soluble or insoluble particle group that acts as reservoir of condensed water when covering the surface of the material.

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“…The growth of particles is influenced markedly not only by their chemical composition, but also by the initial particle size and ambient RH (Park et al, 2009). Thus, although some efforts should be made to clearly affirm the growth of particles, the OPC data after droplet injection in Fig.…”

Section: Variation Of Particle Numbermentioning

confidence: 99%

Preliminary Study on the Cloud Condensation Nuclei (CCN) Activation of Soot Particles by a Laboratory-scale Model Experiments

Ma¹,

Kim²

2014

ajae

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To visually and chemically verify the rainout of soot particles, a model experiment was carried out with the cylindrical chamber (0.2 m (D) and 4 m (H)) installing a cloud drop generator, a hydrotherometer, a particle counter, a drop collector, a diffusing drier, and an artificial soot particle distributer. The processes of the model experiment were as follows; generating artificial cloud droplets (major drop size : 12-14 μm) until supersaturation reach at 0.52%-nebulizing of soot particles (JIS Z 8901) with an average size of 0.5 μm-counting cloud condensation nuclei (CCN) particles and droplets by OPC and the fixation method (Ma et al., 2011;Carter and Hasegawa, 1975), respectively -collecting of individual cloud drops -observation of individual cloud drops by SEMchemical identifying of residual particle in each individual droplet by SEM-EDX. After 10 minutes of the completion of soot particle inject, the number concentrations of PM of all sizes (¤0.3 μm) dramatically decreased. The time required to return to the initial conditions, i.e., the time needed to CCN activation for the fed soot particles was about 40 minutes for the PM sized from 0.3-2.0 μm. The EDX spectra of residual particles left at the center of individual droplet after evaporation suggest that the soot particles seeded into our experimental chamber obviously acted as CCN. The coexistence of soot and mineral particle in single droplet was probably due to the coalescence of droplets (i.e., two droplets embodying different particles (in here, soot and background mineral particles) were coalesced) or the particle capture by a droplet in our CCN chamber.

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A study on effects of size and structure on hygroscopicity of nanoparticles using a tandem differential mobility analyzer and TEM

Cited by 63 publications

References 23 publications

Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site

Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site

Transverse approach between tunnel environment and corrosion: Particulate matter in the Grand Mare tunnel

Preliminary Study on the Cloud Condensation Nuclei (CCN) Activation of Soot Particles by a Laboratory-scale Model Experiments

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