Surface organization of a DPPC monolayer on concentrated SrCl2 and ZnCl2 solutions

Adams, Ellen M.; Verreault, Dominique; Cochran, Richard E.; Stone, Elizabeth A.; Allen, Heather C.

doi:10.1039/c6cp06887a

Cited by 46 publications

(59 citation statements)

References 74 publications

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“…The smaller separation suggests that the interaction of SO 4 2À with DPPC is stronger. [28] For the ammonium salt solutions, the separations in the range of 139 to 144 cm À1 are much smaller than the sodium salt solutions. (W ¼ 180 cm À1 ).…”

Section: àmentioning

confidence: 99%

“…[75,76] The thickness of a lipid monolayer depends on the concentration of ions in solution. [28] The refractive index of organic-coated aerosols will change with the concentration of ions as the particle experiences loss or uptake of water from the environment. [19] The water retention combined with the organic shell on the particles can potentially impact light scattering by these particles.…”

Section: Atmospheric Implicationsmentioning

confidence: 99%

“…[26,27] In addition, the ion concentration becomes an important parameter since the relative concentration of ions will change as the marine aerosol loses or adsorbs water in the atmosphere. [19,28] Although the chemical composition of the sea surface microlayer has been extensively studied, there is still a lack of knowledge about the interfacial properties of the sea surface microlayer and the physicochemical processes governing the formation of SSA. In attempts to explore the interaction between anion and surfactants at the air-water interface, the Langmuir method and infrared reflection-absorption spectroscopy (IRRAS) have been commonly used for the investigation of surface-active substances in different solutions.…”

Section: Introductionmentioning

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: àmentioning

confidence: 99%

Section: Atmospheric Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Langmuir monolayers at the air-aqueous interface were employed to mimic the organic films that coat the aqueous aerosols (Sobanska et al, 2015;Ruehl and Wilson, 2014;King et al, 2009;Sebastiani et al, 2018;Adams et al, 2016). The stability behaviour of these organic films under irradiation and the impact of photosensitizers on processing the aging of the aerosol are presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Photochemical aging of atmospherically reactive organic compounds involving brown carbon at the air-aqueous interface

Li¹,

Jiang²,

George³

et al. 2019

Preprint

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Abstract. Photosensitizing compounds containing brown carbon can absorb UV light and transfer that energy to low volatile organic compounds at the surface of aqueous particles. To better understand the reactivity and photochemical aging processes of organic coating on the aqueous aerosol surface, we have simulated the photosensitized reaction of organic films made of several long chain fatty acids in a Langmuir trough in the presence or absence of irradiation. Several chemicals (imidazole-2-carboxaldehyde and humic acid), PM2.5 samples collected from the field and secondary organic aerosols samples generated from a simulation chamber were used as photosensitizers to be involved in the photochemistry of the organic films. Stearic acid, elaidic acid, oleic acid and two different phospholipids with the same carbon chain length and different degrees of saturation i.e., 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) and 1,2-dioleoylsn-glycero-3-phosphocholine (DOPC) were chosen as the common organic film-forming species in this analysis. The double bond (trans and cis) in unsaturated organic compounds has an effect on the surface area of the organic monolayer. The OA monolayer possessing a cis double bond in an alkyl chain is more expanded than EA monolayers on artificial seawater that contain a photosensitizer. Monitoring the change in the relative area of DOPC monolayers has shown that DOPC does not react with photosensitizers under dark conditions. Instead, the photochemical reaction initiated by the excited photosensitizer and molecular oxygen can generate hydroperoxidation in the DOPC monolayers, accompanied by an increase in the molecular area. The DSPC monolayers did not yield any photochemical oxidized products under the same conditions. The spectra measured with polarization modulation-infrared reflection absorption spectroscopy (PM-IRRAS) were also consistent with the results of a surface pressure-area isotherm. Here, a reaction mechanism explaining these observations is presented and discussed. The results will contribute to our understanding of the processing of organic aerosol aging that controls the aerosol composition.

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“…49 The concentration and enrichment factors of OC, saccharides and inorganic ions presented in chapter 6 were used to explain the influence of ocean biology on SSA composition, selective transfer pathways of organics matter and inorganic ions to SSA and to assess physical properties of SSA. 66,103,104 Further, the seawater, SSML and SSA samples described in chapter 6…”

Section: Overview Of Thesis Chaptersmentioning

confidence: 99%

Chemical characterization of biomass burning and sea spray aerosol

Jayarathne

Self Cite

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for their commitment, support, and encouragement. I also thank current and past Stone group members, especially my undergraduate mentees Austin Kammerer, Michael Dolan, Ashley Gilbert and Kaitlyn Daugherty for their assistance during my research projects. I would like to thank the organizers of fire lab at Missoula experiment (FLAME-4), Nepal ambient monitoring and source testing experiment (NAMaSTE) and Indonesia field campaigns. I also thank center for aerosol impacts on climate and environment (CAICE) team for their help and guidance. My sincere thanks to my undergraduate supervisor Professor Upul Subasinghe and all the faculty members of the Department of Forestry and Environmental Science, University of Sri Jayewardenepura, Sri Lanka, for all the knowledge and support given me as an undergraduate. I would also like to thank all my teachers from kindergarten to high school for inspiring me to pursue the goals in my life. Most importantly, I thank my loving wife Aruni who stood by me through thick and thin for the last six years. I thank my loving mother and father for their constant and endless support and love given me from the day I was born until this moment to become the person who I am today. I also thank my loving sister for her endless support. I also thank all of my friends in Iowa City for always being there for me no matter what. I am truly grateful to you all for being great friends and making this far away land a home away from home.

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Surface organization of a DPPC monolayer on concentrated SrCl₂ and ZnCl₂ solutions

Cited by 46 publications

References 74 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

Photochemical aging of atmospherically reactive organic compounds involving brown carbon at the air-aqueous interface

Chemical characterization of biomass burning and sea spray aerosol

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