Influence of organic films on the evaporation and condensation of water in aerosol

Davies, James F.; Miles, Rachael E. H.; Haddrell, Allen E.; Reid, Jonathan P.

doi:10.1073/pnas.1305277110

Cited by 138 publications

(183 citation statements)

References 42 publications

(57 reference statements)

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“…The EDB instrument has been described extensively in previous publications (Davies et al, 2012(Davies et al, , 2013Rovelli et al, 2016). EDB measurements at the University of Bristol were performed with a charged droplet confined between two cylindrical electrodes, in a temperature-and relative humidity-controlled (248-330 K, RH of 0 to > 90 %, respectively) chamber.…”

Section: Edb Setup -University Of Bristolmentioning

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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Section: Edb Setup -University Of Bristolmentioning

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.

Self Cite

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show abstract

“…[64] In the last case, organic films would enhance the atmospheric lifetime of aerosol relative to that expected if organic films were not present. [65] In general, the properties of organic-coated aerosols depend on the nature and concentration of the ions present.…”

Section: Atmospheric Implicationsmentioning

confidence: 99%

Impact of anions on the surface organisation of lipid monolayers at the air–water interface

Wang

2017

Environ. Chem.

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Environmental context. Lipids released from lysis of phytoplankton cells are enriched in the sea surface microlayer. Such surface-active organics can be transferred through bursting bubbles to sea-spray aerosols where they can influence atmospheric chemistry. The results presented here suggest that phospholipids combine more readily with SO 4 2À than with Br À , leading to enrichment of organic-coated sulfate salts in marine aerosols.Abstract. Inorganic salts and organic matter are known to be present at higher levels in the sea surface microlayer and marine aerosols; however, the impact of common anions on their surface properties is not well understood. Here, a 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) monolayer was enriched with the sodium and ammonium salts of different anions (Br À , Cl À , NO 3 À , SO 4 2À , CH 3 COO À , and HCO 3 À ), and the effects on the surface properties of the monolayer were investigated. The monolayer phase behaviour and the structure of the lipid phases were studied by surface pressure-area (p-A) isotherms and infrared reflection-absorption spectroscopy (IRRAS). The presence of salts in the subphase was found to increase the surface pressure of the DPPC monolayer at a fixed area per molecule. The effect of the anions follows the order of the Hofmeister series. The higher concentration of salt solution caused the p-A isotherm to shift to larger area. The IRRAS spectra demonstrate that the ordering of the DPPC molecules in the liquid condensed phase remains essentially unaffected, even at higher electrolyte concentrations. DPPC molecules combined with SO 4 2À could be transferred from the ocean to sea spray aerosol. The present study finds that the anions have significant influence on the surface organisation and, consequently, the interfacial properties, of the surface-active species at the air-water interface, a finding that has further implications for atmospheric aerosol nucleation.

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“…Swanson et al, 1999;Svensson et al, 2009;Hoffmann et al, 2013a, b;Stöckel et al, 2005). Recently, a new EDB design with concentric cylindrical electrodes was developed to measure the rapid evaporation and condensation process of single droplets (Heinisch et al, 2006(Heinisch et al, , 2009Davies et al, 2012Davies et al, , 2013.…”

Section: H-j Tong Et Al: a New Electrodynamic Balance (Edb) Designmentioning

confidence: 99%

A new electrodynamic balance (EDB) design for low-temperature studies: application to immersion freezing of pollen extract bioaerosols

et al. 2015

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Abstract. In this paper we describe a newly designed cold electrodynamic balance (CEDB) system, built to study the evaporation kinetics and freezing properties of supercooled water droplets. The temperature of the CEDB chamber at the location of the levitated water droplet can be controlled in the range −40 to +40 • C, which is achieved using a combination of liquid nitrogen cooling and heating by positive temperature coefficient heaters. The measurement of liquid droplet radius is obtained by analysing the Mie elastic light scattering from a 532 nm laser. The Mie scattering signal was also used to characterise and distinguish droplet freezing events; liquid droplets produce a regular fringe pattern, whilst the pattern from frozen particles is irregular. The evaporation rate of singly levitated water droplets was calculated from time-resolved measurements of the radii of evaporating droplets and a clear trend of the evaporation rate on temperature was measured. The statistical freezing probabilities of aqueous pollen extracts (pollen washing water) are obtained in the temperature range −4.5 to −40 • C. It was found that that pollen washing water from water birch (Betula fontinalis occidentalis) pollen can act as ice nuclei in the immersion freezing mode at temperatures as warm as −22.45 (±0.65) • C. Furthermore it was found that the protein-rich component of the washing water was significantly more iceactive than the non-proteinaceous component.

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Influence of organic films on the evaporation and condensation of water in aerosol

Cited by 138 publications

References 42 publications

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

Impact of anions on the surface organisation of lipid monolayers at the air–water interface

A new electrodynamic balance (EDB) design for low-temperature studies: application to immersion freezing of pollen extract bioaerosols

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