Impact of palmitic acid coating on the water uptake and loss of ammonium sulfate particles

Garland, R. M.; Wise, Matthew E.; Beaver, M. R.; DeWitt, H. Langley; Aiken, A. C.; Jiménez, José; Tolbert, Margaret A.

doi:10.5194/acp-5-1951-2005

Cited by 79 publications

(88 citation statements)

References 65 publications

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“…Along with sodium salts, ammonium salts -which are major components of tropospheric aerosols -have been extensively studied in atmospheric aerosol nucleation. [51][52][53] The addition of ammonium salts (except ammonium sulfate) in the subphase of DPPC monolayer leads to a general increase in the surface pressure at a fixed molecular area. Ammonium sulfate is the traditional kosmotropic salt for the salting out of protein from an aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

“…[68][69][70] If a small amount of water does adsorb to the surface, it can then diffuse through the coating or through coating defects and activate the inorganic core. [51] Inorganic and organic acids also have received attention recently in terms of their roles in Cl À /Br À depletion reactions in marine aerosols. [71] SO 4 2À has been shown to substitute for Cl À more effectively than NO 3 À in fine marine particles.…”

Section: Atmospheric Implicationsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…[22][23][24][25] Therefore, it is of interest to understand the lifetime of organic surface films due to oxidation, as well as to explore the potential impacts of aged films on gas-aerosol mass transfer.…”

Section: Introductionmentioning

confidence: 99%

The Oxidation of Oleate in Submicron Aqueous Salt Aerosols: Evidence of a Surface Process

2007

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We have studied the oxidation of submicron aqueous aerosols consisting of internal mixtures of sodium oleate (oleic acid proxy), sodium dodecyl sulfate, and inorganic salts by O 3 , NO 3 /N 2 O 5 , and OH. Experiments were performed using an aerosol flow tube and a continuous flow photochemical reaction chamber coupled to a chemical ionization mass spectrometer (CIMS). The CIMS was fitted with a heated inlet for volatilization and detection of organics in the particle phase simultaneously with the gas phase. A differential mobility analyzer/condensation particle counter was used for determining aerosol size distributions. The oxidation of oleate by O 3 follows Langmuir-Hinshelwood kinetics, with γ O 3 ≈ 10 -5 calculated from the observed loss rate of oleate in the particle phase. The best fit Langmuir-Hinshelwood parameters are k max I ) 0.05 ( 0.01 s -1 and K O 3 ) 4((3) × 10 -14 cm 3 molec -1 . These parameters showed no dependence on the ionic composition of the aerosols or on the presence of alkyl surfactants. Several ozone oxidation products were observed to be particle-bound at ambient temperature, including nonanoic acid. We observed efficient processing of oleate by OH (0.1 e γ OH e 1), and we suggest an upper bound of γ Ν 3 < 10 -3 . We conclude that for the aerosol compositions studied, oxidation occurs near the gas-aerosol interface and that the 1 e-fold lifetime of unsaturated organics at the aerosol surface is ∼10 min due to O 3 oxidation under atmospheric conditions. In the context of a Langmuir-Hinshelwood mechanism, different underlying aerosol compositions may extend the lifetime of oleic acid at the surface by reducing K O 3 .

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“…78,79 On the other hand, highly insoluble long chain fatty acids such as palmitic acid, depending on the organic mass fraction, are found to have little to no effect on the deliquescence and efflorescence of inorganic crystalline salts. 80,81 To determine the effect of simple and complex carbohydrates on the water uptake of crystalline aerosol particles, we probe the hygroscopicity of NaCl mixed with these carbohydrates at different atmospherically relevant mass ratios. The resulting water uptake profiles for the hydration of NaCl/ glucose mixtures are shown in Fig.…”

Section: Interactions Of Water Vapor With Mixtures Of Sodium Chlormentioning

confidence: 99%

Linking hygroscopicity and the surface microstructure of model inorganic salts, simple and complex carbohydrates, and authentic sea spray aerosol particles

Estillore

Morris

et al. 2017

Phys. Chem. Chem. Phys.

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Individual airborne sea spray aerosol (SSA) particles show diversity in their morphologies and water uptake properties that are highly dependent on the biological, chemical, and physical processes within the sea subsurface and the sea surface microlayer. In this study, hygroscopicity data for model systems of organic compounds of marine origin mixed with NaCl are compared to data for authentic SSA samples collected in an ocean-atmosphere facility providing insights into the SSA particle growth, phase transitions and interactions with water vapor in the atmosphere. In particular, we combine single particle morphology analyses using atomic force microscopy (AFM) with hygroscopic growth measurements in order to provide important insights into particle hygroscopicity and the surface microstructure. For model systems, a range of simple and complex carbohydrates were studied including glucose, maltose, sucrose, laminarin, sodium alginate, and lipopolysaccharides. The measured hygroscopic growth was compared with predictions from the Extended-Aerosol Inorganics Model (E-AIM). It is shown here that the E-AIM model describes well the deliquescence transition and hygroscopic growth at low mass ratios but not as well for high ratios, most likely due to a high organic volume fraction. AFM imaging reveals that the equilibrium morphology of these single-component organic particles is amorphous. When NaCl is mixed with the organics, the particles adopt a core-shell morphology with a cubic NaCl core and the organics forming a shell similar to what is observed for the authentic SSA samples. The observation of such core-shell morphologies is found to be highly dependent on the salt to organic ratio and varies depending on the nature and solubility of the organic component. Additionally, single particle organic volume fraction AFM analysis of NaCl : glucose and NaCl : laminarin mixtures shows that the ratio of salt to organics in solution does not correspond exactly for individual particles -showing diversity within the ensemble of particles produced even for a simple two component system. IntroductionCovering a substantial area of the Earth's surface, the ocean serves as one of the main sources of particulate matter in the atmosphere. Sea spray aerosols (SSAs) are generated by breaking waves in marine environments and account for the largest atmospheric aerosol flux. it has a profound influence on the composition of aerosol particles as they escape across the interface. The SSML is a rich mixture of organic compounds such as fatty acids, fatty alcohols, sterols, carbohydrates, proteins and more complex colloids and aggregates exuded by phytoplankton such as lipopolysaccharides (LPSs). 11,12In the authentic samples collected from a pristine region of the Pacific Ocean, Gagosian and coworkers 13 detected alcohols, fatty acid salts and esters as specific tracers of ocean-derived organic compounds in atmospheric aerosols. The organic compounds include saccharides, fatty acids, and a few other organic classes. 13 Progress in analytic...

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Impact of palmitic acid coating on the water uptake and loss of ammonium sulfate particles

Cited by 79 publications

References 65 publications

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

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

The Oxidation of Oleate in Submicron Aqueous Salt Aerosols: Evidence of a Surface Process

Linking hygroscopicity and the surface microstructure of model inorganic salts, simple and complex carbohydrates, and authentic sea spray aerosol particles

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