Combined Sum Frequency Generation and Thin Liquid Film Study of the Specific Effect of Monovalent Cations on the Interfacial Water Structure

Langmuir : the ACS Journal of Surfaces and Colloids
Afshin Asadzadeh ShahirElena Mileva

Abstract

Some salts have been recently shown to decrease the sum frequency generation (SFG) intensity of the hydrogen-bonded water molecules, but a quantitative explanation is still awaited. Here, we report a similar trend for the chloride salts of monovalent cations, that is, LiCl, NaCl, and CsCl, at low concentrations. Specifically, we revealed not only the specific adsorption of cations at the water surface but also the concentration-dependent effect of ions on the SFG response of the interfacial water molecules. Our thin-film pressure balance (TFPB) measurements (stabilized by 10 mM of methyl isobutyl carbinol) enabled the determination of the surface potential that governs the surface electric field affecting interfacial water dipoles. The use of the special alcohol also enabled us to identify a remarkable specific screening effect of cations on the surface potential. We explained the concentration dependency by considering the direct ion-water interactions and water reorientation under the influence of surface electric field as the two main contributors to the overall SFG signal of the hydrogen-bonded water molecules. Although the former was dominant only at the low-concentration range, the effect of the latter intensified with in...Continue Reading

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Aug 17, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Tatyana V PeshkovaRadomir I Slavchov

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Citations

Sep 7, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Felix Schulze-ZachauBjörn Braunschweig
Feb 5, 2019·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Natalia García ReyBjörn Braunschweig

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