Phase State and Saturation Vapor Pressure of Submicron Particles of <i>meso</i>-Erythritol at Ambient Conditions

Emanuelsson, Eva U.; Tschiskale, Morten; Bilde, Merete

doi:10.1021/acs.jpca.6b04349

Cited by 9 publications

(9 citation statements)

References 57 publications

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“…The improved OPC-b, however, did not provide much improvement for estimating the water vapor mass accommodation coefficient. The plausible values .0:2 > a 1/ for a wide range of aerosol hygroscopicities are consistent with previously estimated mass accommodation coefficients from hygroscopicity tandem differential mobility analyser data, CCN and electronic dynamic balance experiments studies (Ruehl et al 2008;Raatikainen et al 2013;Emanuelsson et al 2016;Rovelli et al 2016). Our findings agree with an increasing body of work that suggests that simple aerosol (those absent film-forming compounds, slow solute dissolution and viscous glass-like compounds) have a greater than 0.1 (Raatikainen et al 2013;Langridge et al 2016;Noziere 2016;Ruehl et al 2016).…”

Section: Summary and Implicationssupporting

confidence: 89%

Exploring CCN droplet suppression with a higher sensitivity optical particle counter

Fofie

Castelluccio

Asa-Awuku

2017

Aerosol Science and Technology

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The continuous flow thermal gradient cloud condensation nuclei counter (CCNc) is the instrument currently widely used in exploring the interactions of aerosol with water vapor in the supersaturated regime. In this study we use a CCNc with an optical particle counter (OPC) modified to twice the sensitivity of the default OPC on the standard CCNc built by DMT, Inc. The standard OPC and the modified OPC-b are used to explore the droplet growth of inorganic and organic salts and the effects of cloud condensation nuclei concentrations on the final droplet sizes. We also couple the higher sensitivity OPC-b with the continuous flow streamwise thermal gradient CCNc (CFSTGC) model to estimate the mass accommodation coefficient, a. For inorganic and organic aerosol, a mass accommodation coefficient, a >> 0.2 will yield modeled droplet diameters consistent with experimental and ambient observations. However, using higher sensitivity CCN data, the final droplet diameters of CCN appear independent of aerosol hygroscopicity but strongly dependent on the CCN concentration. The final droplet diameters are suppressed by » 0.2 mm for every 1000 cm ¡ 3 CCN, even at CCN concentrations less than 5000 cm ¡ 3. Our current understanding of aerosol CCN formation and droplet kinetics may therefore be dependent on the sensitivity of the optical particle counter in the CCNc.

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Section: Summary and Implicationssupporting

confidence: 89%

Exploring CCN droplet suppression with a higher sensitivity optical particle counter

Fofie

Castelluccio

Asa-Awuku

2017

Aerosol Science and Technology

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“…ARAGORN (AaRhus Aerosol Gas evapORatioN flow tube) is a TDMA setup including a laminar flow tube (Bilde et al, 2003;Emanuelsson et al, 2016) allowing for studies under dry (e.g., Bilde et al, 2003;Frosch et al, 2010) or humid (e.g., Riipinen et al, 2006;Zardini et al, 2010) conditions. In this work dried aerosol particles from nebulized aqueous solution were size-selected to monodisperse size distributions (69-285 nm) using a differential mobility analyzer (DMA), diluted with dry clean air, and allowed to evaporate in a temperature-controlled (282-322 K) laminar flow tube at ambient pressure.…”

Section: Ft-tdma Setup -University Of Aarhusmentioning

confidence: 99%

A reference data set for validating vapor pressure measurement techniques: homologous series of polyethylene glycols

Krieger¹,

Siegrist²,

Marcolli³

et al. 2018

Atmos. Meas. Tech.

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Abstract. To predict atmospheric partitioning of organic compounds between gas and aerosol particle phase based on explicit models for gas phase chemistry, saturation vapor pressures of the compounds need to be estimated. Estimation methods based on functional group contributions require training sets of compounds with well-established saturation vapor pressures. However, vapor pressures of semivolatile and low-volatility organic molecules at atmospheric temperatures reported in the literature often differ by several orders of magnitude between measurement techniques. These discrepancies exceed the stated uncertainty of each technique which is generally reported to be smaller than a factor of 2. At present, there is no general reference technique for measuring saturation vapor pressures of atmospherically relevant compounds with low vapor pressures at atmospheric temperatures. To address this problem, we measured vapor pressures with different techniques over a wide temperature range for intercomparison and to establish a reliable training set. We determined saturation vapor pressures for the homologous series of polyethylene glycols (H−(O−CH 2 −CH 2 ) n −OH) for n = 3 to n = 8 ranging in vapor pressure at 298 K from 10 −7 to 5 × 10 −2 Pa and compare them with quantum chemistry calculations. Such a homologous series provides a reference set that covers several orders of magnitude in saturation vapor pressure, allowing a critical assessment of the lower limits of detection of vapor pressures for the different techniques as well as permitting the identification of potential sources of systematic error. Also, internal consistency within the series allows outlying data to be rejected more easily. Most of the measured vapor pressures agreed within the stated uncertainty range. Deviations mostly occurred for vapor pressure values approaching the lower detection limit of a technique. The good agreement between the measurement techniques (some of which are sensitive to the mass accommodation coefficient and some not) suggests that the mass accommodation coefficients of the studied compounds are close to unity. The quantum chemistry calculations were about 1 order of magnitude higher than the measurements. We find that extrapolation of vapor pressures from elevated to atmospheric temperatures is permissible over a range of about 100 K for these compounds, suggesting that measurements should be performed best at temperatures yielding the highest-accuracy data, allowing subsequent extrapolation to atmospheric temperatures.

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“…ARAGORN (AaRhus Aerosol Gas evapORatioN flow tube) is a Tandem Differential Mobility Analyzer (TDMA) set-up including a laminar Flow Tube (Bilde et al, 2003;Emanuelsson et al, 2016) allowing for studies under dry (e.g. (Bilde et al, 2003;Frosch et al, 2010)) or humid (e.g.…”

Section: Ft-tdma Setup University Of Aarhusmentioning

confidence: 99%

A reference data set for validating vapor pressure measurement techniques: Homologous series of polyethylene glycols

Krieger¹,

Siegrist²,

Marcolli³

et al. 2017

Preprint

Self Cite

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Abstract. To predict atmospheric partitioning of organic compounds between gas and aerosol particle phase based on explicit models for gas phase chemistry, saturation vapor pressures of the compounds need to be estimated. Estimation methods based on functional group contributions require training sets of compounds with well established saturation vapor pressures. However, vapor pressures of semi- and low volatile organic molecules at atmospheric temperatures reported in the literature often differ by several orders of magnitude between measurement techniques. These discrepancies exceed the stated uncertainty of each technique which is generally reported to be smaller than a factor of two. At present, there is no general reference technique for measuring saturation vapor pressures of atmospherically relevant compounds with low vapor pressures at atmospheric temperatures. To address this problem we measured vapor pressures with different techniques over a wide temperature range for intercomparison and to establish a reliable training set. We determined saturation vapor pressures for the homologous series of polyethylene glycols (H–(O–CH2–CH2)n–OH) for n = 3 to n = 8 ranging in vapor pressure at 298 K from 10−7 Pa to 5 · 10−2 Pa and compare them with quantum chemistry calculations. Such a homologous series provides a reference set that covers several orders of magnitude in saturation vapor pressure, allowing a critical assessment of the lower limits of detection of vapor pressures for the different techniques as well as permitting the identification of potential sources of systematic error. Also, internal consistency within the series allows to reject outlying data more easily. Most of the measured vapor pressures agreed within the stated uncertainty range. Deviations mostly occurred for vapor pressures values approaching the lower detection limit of a technique. The good agreement between the measurement techniques (some of which are sensitive to the mass accommodation coefficient and some not) suggest that the mass accommodation coefficients of the studied compounds are close to unity. The quantum chemistry calculations were about one order of magnitude higher than the measurements. We find that extrapolation of vapor pressures from elevated to atmospheric temperatures is permissible over a range of about 100 K for these compounds, suggesting that measurements should be performed best at temperatures yielding the highest accuracy data allowing subsequent extrapolation to atmospheric temperatures.

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Phase State and Saturation Vapor Pressure of Submicron Particles of meso-Erythritol at Ambient Conditions

Cited by 9 publications

References 57 publications

Exploring CCN droplet suppression with a higher sensitivity optical particle counter

Exploring CCN droplet suppression with a higher sensitivity optical particle counter

A reference data set for validating vapor pressure measurement techniques: homologous series of polyethylene glycols

A reference data set for validating vapor pressure measurement techniques: Homologous series of polyethylene glycols

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