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000625354 1001_ $$0P:(DE-H253)PIP1100593$$aGholami, Shirin$$b0
000625354 245__ $$aInteraction of ions and surfactants at the seawater–air interface
000625354 260__ $$aCambridge$$bRoyal Society of Chemistry$$c2025
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000625354 520__ $$aThe interface of the oceans and aqueous aerosols with air drives many important physical and chemical processes in the environment, including the uptake of CO2 by the oceans. Transport across and reactions at the ocean–air boundary are in large part determined by the chemical composition of the interface, i.e., the first few nanometers into the ocean. The main constituents of the interface, besides water molecules, are dissolved ions and amphiphilic surfactants, which are ubiquitous in nature. We have used a combination of surface tension measurements and liquid-jet X-ray photoelectron spectroscopy to investigate model seawater solutions at realistic ocean-water ion concentrations in the absence and in the presence of model surfactants. Our investigations provide a quantitative picture of the enhancement or reduction of the concentration of ions due to the presence of charged surfactants at the interface. We have also directly determined the concentration of surfactants at the interface, which is related to the ionic strength of the solution (i.e., the “salting out” effect). Our results show that the interaction of ions and surfactants can strongly change the concentration of both classes of species at aqueous solution–air interfaces, with direct consequences for heterogeneous reactions as well as gas uptake and release at ocean–air interfaces.
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000625354 7001_ $$0P:(DE-H253)PIP1095694$$aButtersack, Tillmann$$b1
000625354 7001_ $$0P:(DE-H253)PIP1098291$$aRichter, Clemens$$b2
000625354 7001_ $$0P:(DE-H253)PIP1017364$$aTrinter, Florian$$b3
000625354 7001_ $$0P:(DE-H253)PIP1097998$$aDupuy, Remi$$b4
000625354 7001_ $$0P:(DE-HGF)0$$aCablitz, Louisa$$b5
000625354 7001_ $$0P:(DE-H253)PIP1108125$$aZhou, Qi$$b6
000625354 7001_ $$0P:(DE-H253)PIP1102022$$anicolas, christophe$$b7
000625354 7001_ $$0P:(DE-HGF)0$$aShavorskiy, Andrey$$b8
000625354 7001_ $$0P:(DE-H253)PIP1014198$$aDiaman, Dian$$b9$$udesy
000625354 7001_ $$0P:(DE-H253)PIP1008114$$aHergenhahn, Uwe$$b10
000625354 7001_ $$0P:(DE-H253)PIP1023483$$aWinter, Bernd$$b11
000625354 7001_ $$0P:(DE-H253)PIP1098267$$aBluhm, Hendrik$$b12$$eCorresponding author
000625354 770__ $$aBrilliant Light Sources
000625354 773__ $$0PERI:(DE-600)3057711-1$$a10.1039/D4EA00151F$$gVol. 5, no. 3, p. 291 - 299$$n3$$p291 - 299$$tEnvironmental science / Atmospheres$$v5$$x2634-3606$$y2025
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