Establishing a model organic film of low volatile compound mixture on aqueous aerosol surface

Li, Siyang; Cheng, Shumin; Du, Lin; Wang, Wenxing

doi:10.1016/j.atmosenv.2018.11.052

Cited by 10 publications

(20 citation statements)

References 64 publications

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“…A review paper (Lu et al, 2000) details how neutron reflectometry can be used to determine the surface concentration of organic films present as a monolayer at the air-water interface. In short, neutron reflectivity depends on the differences between concentrations of atoms with a characteristic neutron scattering length in adjacent thin layers of material.…”

Section: Neutron Reflectometrymentioning

confidence: 99%

Ozonolysis of fatty acid monolayers at the air–water interface: organic films may persist at the surface of atmospheric aerosols

et al. 2021

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Abstract. Ozonolysis of fatty acid monolayers was studied to understand the fate of organic-coated aerosols under realistic atmospheric conditions. Specifically, we investigated the effects of temperature and salinity on the degradation of oleic acid at the air–water interface and the persistence of the aged surfactant film at the surface. The presence of a residual film is of atmospheric importance, as surface monolayers affect the physical properties of the droplets and because of the role they play in cloud formation. This occurs via several effects, most notably via surface tension reduction. The interplay between atmospheric aerosol loading and the formation, nature, and persistence of clouds is a key uncertainty in climate modelling. Our data show that a residual surface film, which we suspect to be formed of nonanoic acid and a mixture of azelaic and 9-oxononanoic acids, is retained at the interface after ozonolysis at near-zero temperatures but not at room temperature. Given the low-temperature conditions used here are atmospherically realistic, the persistence of a product film must be considered when assessing the impact of unsaturated fatty acid partitioned to the air–water interface. The presence of stable (non-oxidisable) reaction products also opens the possibility of build-up of inert monolayers during the aerosol life cycle with potential implications for cloud formation. Furthermore, we measured the kinetic behaviour of these films and found that the reactions are not significantly affected by the shift to a lower temperature with rate coefficients determined to be (2.2 ± 0.4) × 10−10 cm2 s−1 at 21 ± 1 ∘C and (2.2 ± 0.2) × 10−10 cm2 s−1 at 2 ± 1 ∘C.

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Section: Neutron Reflectometrymentioning

confidence: 99%

Ozonolysis of fatty acid monolayers at the air–water interface: organic films may persist at the surface of atmospheric aerosols

et al. 2021

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“…The lift-off area of C18OH increases to 34.2 Å 2 / molecule on the artificial seawater ( Figure 2d), which was comparable with that of SA. This expansion can be ascribed to the abundant anions dispersing at the surface (Jungwirth & Tobias, 2006;Li et al, 2019), which competed for space with the hydroxy groups of C18OH and thus resulted in a lower packing density (Li et al, 2019).…”

Section: Surface Pressure-area (π-A) Isothermmentioning

confidence: 99%

Understanding the Interfacial Behavior of Typical Perfluorocarboxylic Acids at Surfactant‐Coated Aqueous Interfaces

Cheng

George

2020

JGR Atmospheres

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Sea surface microlayers (SMLs) play an important role in the transport and fate of surfactants from both anthropogenic and biogenic sources. The formation of sea spray aerosols (SSAs) at the SML has been recognized as a critical pathway for the entry of surfactants into the atmosphere. Perfluorocarboxylic acids (PFCAs) have become increasingly concerning as a class of emerging organic pollutants, having high enrichment in surface seawaters due to their remarkable surface activity. Using artificial seawater coated by extensively existed surfactants, including stearyl alcohol (C18OH) and stearic acid (SA) as simplified models of the SML and fresh SSAs, the interfacial behaviors of soluble and insoluble PFCAs were examined. Information about lateral packing and chain conformation of films was obtained by means of Langmuir trough and infrared reflection‐absorption spectroscopy (IRRAS). Perfluorooctanoic acid (PFOA) dissolved in aqueous subphases was found to be incorporated into lipid monolayers via alterations in surface pressure‐area (π‐A) isotherms. With negligible solubility, perfluorotetradecanoic acid (PFTA) formed condensed mixed monolayers with other lipids at the air‐water interface. The mixed monolayers of C18OH/PFTA and SA/PFTA were expanded by the addition of sea salts into the pure water subphase. Compared with the π‐A isotherms of SA/PFTA, decreased molecular areas were observed for those of C18OH/PFTA. This research suggests that PFCAs can be incorporated into air‐water interfaces by acting as film‐forming materials. The introduction of PFCAs will alter the surface properties and thus the atmospheric fate and behavior of SSAs and SMLs.

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“… 17 , 46 , 56 , 57 On the other hand, mixtures of surface-active molecules can be chosen with a specific blend so that their adsorption properties are enhanced. 19 , 53 Pheromones are known to often be released with accurate blend ratios, 3 , 12 but there is no current explanation on how these blends could remain stable from emitter gland to receptor insect. Aggregation and synergistic effects might occur between the molecules of the blend and help to maintain a stable ratio between the molecules.…”

Section: Consequences Of Aerosol Transport In Chemical Communicationmentioning

confidence: 99%

“…Uptake by the aerosol surface of surfactant molecules has already been demonstrated. 17 − 19 Moreover, in area in which insects evolved, plant and soil intense activity participates in aerosol generation and maintains a high relative humidity, from 80% to 100% near the ground (<20m). 20 − 23 Additionally, many moths call during the night when humidity is the highest thus increasing aerosol water content.…”

Section: Introductionmentioning

confidence: 99%

How Adsorption of Pheromones on Aerosols Controls Their Transport

et al. 2020

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We propose a general transport theory for pheromone molecules in an atmosphere containing aerosols. Many pheromones are hydrophobic molecules containing polar groups. They are low volatile and have some properties similar to those of hydrotropes. They therefore form a nonsoluble film at the water–air interface of aerosols. The fate of a small pheromone puff in air is computed through reaction-diffusion equations. Partitioning of pheromones between the gas and the aerosol surface over time is studied for various climate conditions (available aerosol surface) and adsorption affinities (energy of adsorption). We show that, for adsorption energy above 30 k B T per molecule, transport of pheromones on aerosols dominates over molecular transport typically 10 s after pheromone emission, even when few adsorbing aerosols are present. This new communication path for airborne chemicals leads to distinctive features including enhanced signal sensibility and increased persistence of pheromone concentration in the air due to slow diffusion of aerosols. Each aerosol droplet has the ability to adsorb thousands of pheromones to the surface, keeping a “history” of the atmospheric content between emission and reception. This new mechanism of pheromone transport leads to dramatic consequences on insect sensing revisiting the way we figure the capture of chemical signals.

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Establishing a model organic film of low volatile compound mixture on aqueous aerosol surface

Cited by 10 publications

References 64 publications

Ozonolysis of fatty acid monolayers at the air–water interface: organic films may persist at the surface of atmospheric aerosols

Ozonolysis of fatty acid monolayers at the air–water interface: organic films may persist at the surface of atmospheric aerosols

Understanding the Interfacial Behavior of Typical Perfluorocarboxylic Acids at Surfactant‐Coated Aqueous Interfaces

How Adsorption of Pheromones on Aerosols Controls Their Transport

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