Quantification and prediction of water uptake by soot deposited on ventilation filters during fire events

Lintis, Laura; Ouf, F. X.; Parent, Philippe; Ferry, Daniel; Laffon, C.; Vallières, Cécile

doi:10.1016/j.jhazmat.2020.123916

Cited by 6 publications

(7 citation statements)

References 54 publications

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“…The droplet formation of water-insoluble particles has been previously described with adsorption activation models (Hatch et al, 2012;Kumar et al, 2009;Lintis et al, 2021;Malek et al, 2022;Navea et al, 2017;Pajunoja et al, 2015;Tang et al, 2016). Brunauer, Emmett, and Teller adsorption isotherm models are typically applied for multilayer adsorption analysis of water uptake on clays (Hatch et al, 2012) and fly ash (Navea et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Brunauer, Emmett, and Teller adsorption isotherm models are typically applied for multilayer adsorption analysis of water uptake on clays (Hatch et al, 2012) and fly ash (Navea et al, 2017). Lintis et al (2021) applied the Dubinin-Serpinsky model for soot and concluded that nucleation occurred at oxidized and hydrophilic surface sites on the soot. Pajunoja et al (2015) measured the TK hygroscopicity for SOA and demonstrated that the droplet growth of organic compounds with low O : C ratio was an adsorption-dominated process for both sub-and supersaturated water vapor conditions.…”

Section: Introductionmentioning

confidence: 99%

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A single-parameter hygroscopicity model for functionalized insoluble aerosol surfaces

2022

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Abstract. The impact of molecular level surface chemistry for aerosol water-uptake and droplet growth is not well understood. In this work, spherical, nonporous, monodisperse polystyrene latex (PSL) particles treated with different surface functional groups are exploited to isolate the effects of aerosol surface chemistry for droplet activation. PSL is effectively water insoluble and changes in the particle surface may be considered a critical factor in the initial water uptake of water-insoluble material. The droplet growth of two surface modified types of PSL (PSL-NH2 and PSL-COOH) along with plain PSL was measured in a supersaturated environment with a Cloud Condensation Nuclei Counter (CCNC). Three droplet growth models – traditional Köhler (TK), Flory–Huggins Köhler (FHK) and the Frenkel–Halsey–Hill adsorption theory (FHH-AT) were compared with experimental data. The experimentally determined single hygroscopicity parameter, κ, was found within the range from 0.002 to 0.04. The traditional Köhler prediction assumes Raoult's law solute dissolution and underestimates the water-uptake ability of the PSL particles. FHK can be applied to polymeric aerosol; however, FHK assumes that the polymer is soluble and hydrophilic. Thus, the FHK model generates a negative result for hydrophobic PSL and predicts non-activation behavior that disagrees with the experimental observation. The FHH-AT model assumes that a particle is water insoluble and can be fit with two empirical parameters (AFHH and BFHH). The FHH-AT prediction agrees with the experimental data and can differentiate the water uptake behavior of the particles owing to surface modification of PSL surface. PSL-NH2 exhibits slightly higher hygroscopicity than the PSL-COOH, whereas plain PSL is the least hygroscopic among the three. This result is consistent with the polarity of surface functional groups and their affinity to water molecules. Thus, changes in AFHH and BFHH can be quantified when surface modification is isolated for the study of water-uptake. The fitted AFHH for PSL-NH2, PSL-COOH, and plain PSL is 0.23, 0.21, and 0.18 when BFHH is unity. To simplify the use of FHH-AT for use in cloud activation models, we also present and test a new single parameter framework for insoluble compounds, κFHH. κFHH is within 5 % agreement of the experimental data and can be applied to describe a single-parameter hygroscopicity for water-insoluble aerosol with surface modified properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A single-parameter hygroscopicity model for functionalized insoluble aerosol surfaces

2022

View full text Add to dashboard Cite

show abstract

“…The droplet formation of water-insoluble particles has been previously described with adsorption activation models (Hatch et al, 2012;Kumar et al, 2009;Lintis et al, 2021;Malek et al, 2022;Navea et al, 2017;Pajunoja et al, 2015;Tang et al, 2016). Brunauer, Emmett, and Teller (BET) adsorption isotherm models are typically applied for multilayer adsorption analysis of water uptake on clays (Hatch et al, 2012) 45 and fly ash (Navea et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Brunauer, Emmett, and Teller (BET) adsorption isotherm models are typically applied for multilayer adsorption analysis of water uptake on clays (Hatch et al, 2012) 45 and fly ash (Navea et al, 2017). Lintis et al, 2021 applied the Dubinin-Serpinsky model for soot and concluded that nucleation occurred at oxidized and hydrophilic surface sites on the soot. Pajunoja et al measured the TK hygroscopicity for SOA and demonstrated that the droplet growth of organic compounds with low O:C ratio was an adsorption-dominated process for both sub -and super-saturated water vapor conditions.…”

Section: Introductionmentioning

confidence: 99%

A Single Parameter Hygroscopicity Model for Functionalized and Insoluble Aerosol Surfaces

Mao

Gohil

Asa-Awuku

2022

Preprint

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Abstract. The impact of molecular level surface chemistry for aerosol water-uptake and droplet growth is not well understood. In this work, spherical, non-porous, monodisperse Polystyrene Latex particles treated with different surface functional groups are exploited to isolate the effects of aerosol surface chemistry for droplet activation. PSL is effectively water-insoluble and changes in the particle surface may be considered a critical factor in the initial water-uptake of water insoluble material. The droplet growth of two surface modified types of PSL (PSL-NH2 and PSL-COOH) along with plain PSL was measured in a supersaturated environment with a Cloud Condensation Nuclei Counter (CCNC). Three droplet growth models - traditional Köhler (TK), Flory-Huggins Köhler (FHK) and the Frenkel-Halsey-Hill adsorption theory (FHH-AT) were compared to experimental data. The experimentally determined single hygroscopicity parameter, κ, was found in the range from 0.002 to 0.04. The traditional Köhler prediction assumes Raoult’s law solute dissolution and underestimates the water-uptake ability of the PSL particles. FHK can be applied to polymeric aerosol; however, FHK assumes the polymer is soluble and hydrophilic. Thus, the FHK model generates a negative result for hydrophobic PSL and predicts non-activation behavior that disagrees with the experimental observation. The FHH-AT model assumes that a particle is water-insoluble and can be fit with 2 empirical parameters (AFHH and BFHH). The FHH-AT prediction agrees with the experimental data and can differentiate the water uptake behavior of the particles due to surface modification of PSL surface. PSL-NH2 exhibits slightly higher hygroscopicity than the PSL-COOH, while plain PSL is the least hygroscopic among the three. This result is consistent with the polarity of surface functional groups and their affinity to water molecules. Thus, changes in AFHH and BFHH can be quantified when surface modification is isolated for the study of water-uptake. The fitted AFHH for PSL-NH2, PSL-COOH and plain PSL is 0.23, 0.21 and 0.18 when BFHH is unity. To simplify the use of FHH-AT for use in cloud activation models, we also present and test a new single parameter framework for insoluble compounds, κFHH. κFHH is within 5 % agreement of the experimental data and can be applied to describe a single-parameter hygroscopicity for water-insoluble aerosol with surface modified properties.

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“…Beyond the question of identifying the most relevant temperature for soot burn-off, oxidation of soot is a complex process due to their heterogeneous and versatile structure. Indeed, the chemical composition of soot emitted during fires can vary from organic to elemental carbon and the soot particle themselves can adsorb at their surface different kinds of complex organic molecules and even water ones (Lintis et al, 2021). Despite their complex nature, soot particles oxidation is generally assumed to produce mostly CO2, CO and H2O.…”

Section: Introductionmentioning

confidence: 99%

An innovative method for soot deposit quantification using a CO2 sensor: Application to fire studies in research facilities

Kort

Ouf

Lakhmi

et al. 2022

Journal of Aerosol Science

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Quantification and prediction of water uptake by soot deposited on ventilation filters during fire events

Abstract: Graphical abstract

Cited by 6 publications

References 54 publications

A single-parameter hygroscopicity model for functionalized insoluble aerosol surfaces

A single-parameter hygroscopicity model for functionalized insoluble aerosol surfaces

A Single Parameter Hygroscopicity Model for Functionalized and Insoluble Aerosol Surfaces

An innovative method for soot deposit quantification using a CO2 sensor: Application to fire studies in research facilities

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