Characterization of a dimer preparation method for nanoscale organic aerosol

Rothfuss, Nicholas E.; Petters, Sarah Suda; Champion, Wyatt M.; Grieshop, Andrew P.; Petters, M. D.

doi:10.1080/02786826.2019.1623379

Cited by 13 publications

(18 citation statements)

References 58 publications

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“…The main thrusts described therein are briefly summarized here. A number of new techniques were developed to better quantify aerosol phase state [24][25][26][27][28][29][30] . Factors that increase OA viscosity have been identified to be increasing compound molecular weight 31 , O:C ratio 32 , and functional group composition 19,33 .…”

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confidence: 99%

Predicting the influence of particle size on the glass transition temperature and viscosity of secondary organic material

Petters

Kasparoǧlu

2020

Sci Rep

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Atmospheric aerosols can assume liquid, amorphous semi-solid or glassy, and crystalline phase states. Particle phase state plays a critical role in understanding and predicting aerosol impacts on human health, visibility, cloud formation, and climate. Melting point depression increases with decreasing particle diameter and is predicted by the Gibbs–Thompson relationship. This work reviews existing data on the melting point depression to constrain a simple parameterization of the process. The parameter $$\xi $$ ξ describes the degree to which particle size lowers the melting point and is found to vary between 300 and 1800 K nm for a wide range of particle compositions. The parameterization is used together with existing frameworks for modeling the temperature and RH dependence of viscosity to predict the influence of particle size on the glass transition temperature and viscosity of secondary organic aerosol formed from the oxidation of $$\alpha $$ α -pinene. Literature data are broadly consistent with the predictions. The model predicts a sharp decrease in viscosity for particles less than 100 nm in diameter. It is computationally efficient and suitable for inclusion in models to evaluate the potential influence of the phase change on atmospheric processes. New experimental data of the size-dependence of particle viscosity for atmospheric aerosol mimics are needed to thoroughly validate the predictions.

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confidence: 99%

Predicting the influence of particle size on the glass transition temperature and viscosity of secondary organic material

Petters

Kasparoǧlu

2020

Sci Rep

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“…The DCIC technique has been described extensively in prior publications (Champion et al, 2019;Marsh et al, 2018;Petters, 2016, 2017a;Rothfuss et al, 2019;Petters, 2018;Tandon et al, 2019;Petters et al, 2019). The basic concept is briefly introduced and then modifications made to enable low temperature measurements will be described.…”

Section: Viscosity Measurementmentioning

confidence: 99%

“…The shape parameter was converted to viscosity using the Frenkel sintering theory (Pokluda et al, 1997;Rothfuss and Petters, 2016). Example logistic curves including data for sucrose and citric acid aerosol are given in prior work Petters, 2016, 2017a;Marsh et al, 2018;Rothfuss et al, 2019;Tandon et al, 2019;Petters et al, 2019) and the supporting information.…”

Section: Viscosity Measurementmentioning

confidence: 99%

“…Dimer particles are composed of a polyethylene monomer and either a sucrose or citric acid monomer particle. Polyethylene particles were generated using an evaporation-condensation system that is described in Tandon et al (2019) and Rothfuss et al (2019). Citric acid (≥99.5%, Sigma Aldrich, St. Louis, MO, USA) and sucrose (≥99.5%, Sigma Aldrich, St. Louis, MO, USA) were dissolved in HPLC grade water (5 g of solute in 100 ml of HPLC Grade submicron filtered water, Fischer Scientific, USA) and atomized using a constant output atomizer (TSI 3076).…”

mentioning

confidence: 99%

“…The flows from the two DMAs were merged and then split between a CPC with a flow rate of 0.5 L min −1 and the coalescence chamber with a flow rate of 1 L min −1 . The coalescence chamber was shielded with lead to prevent spontaneous particle decharging from naturally occurring ionizing radiation (Rothfuss et al, 2019) and was placed inside the freezer to maintain dimers at cold enough temperature to prevent coalescence before reaching the thermal conditioner. The freezer temperature could be varied between −8ºC and 18ºC.…”

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confidence: 99%

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Toward closure between predicted and observed particle viscosity over a wide range temperature and relative humidity

Kasparoǧlu¹,

Li²,

Shiraiwa³

et al. 2020

Preprint

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Abstract. Atmospheric aerosols can exist in amorphous semi-solid or glassy phase states whose viscosity varies with atmospheric temperature and relative humidity. The temperature and humidity dependence of viscosity has been hypothesized to be predictable from the combination of a water-organic binary mixing rule of the glass transition temperature, a glass transition temperature scaled viscosity fragility parameterization, and a water uptake parameterization. This work presents a closure study between predicted and observed viscosity for sucrose and citric acid. Viscosity and glass transition temperature as a function of water content are compiled from literature data and used to constrain the fragility parameterization. New measurements characterizing viscosity of sub-100 nm particles using the dimer relaxation method are presented. These measurements extend the available data of temperature and humidity dependent viscosity to −28 ºC. Predicted relationships agree well with observations at room temperature and with measured isopleths of constant viscosity at ~107 Pa s and warmer than −28 ºC. Discrepancies at colder temperatures are observed for sucrose particle. Simulations with the kinetic multi-layer model of gas-particle interactions suggest that the observed deviations at colder temperature for sucrose can be attributed to kinetic limitations associated with water uptake at the timescales of the dimer relaxation experiments. Using the available information, updated equilibrium phase-state diagrams (−80 ºC

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Evaluating a simplified oxidation flow reactor configuration to characterize fresh and aged emissions from traditional and plancha-type cookstoves under field-like conditions

Sinha,

Vazquez,

Ruiz-Garcia

et al. 2024

Atmospheric Environment

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Characterization of a dimer preparation method for nanoscale organic aerosol

Cited by 13 publications

References 58 publications

Predicting the influence of particle size on the glass transition temperature and viscosity of secondary organic material

Predicting the influence of particle size on the glass transition temperature and viscosity of secondary organic material

Toward closure between predicted and observed particle viscosity over a wide range temperature and relative humidity

Evaluating a simplified oxidation flow reactor configuration to characterize fresh and aged emissions from traditional and plancha-type cookstoves under field-like conditions

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