Ion specific effects: decoupling ion-ion and ion-water interactions

Physical Chemistry Chemical Physics : PCCP
Jinsuk SongSongi Han

Abstract

Ion-specific effects in aqueous solution, known as the Hofmeister effect, are prevalent in diverse systems ranging from pure ionic to complex protein solutions. The objective of this paper is to explicitly demonstrate how complex ion-ion and ion-water interactions manifest themselves in the Hofmeister effect based on a series of recent experimental observations. These effects are not considered in the classical descriptions of ion effects, such as the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, and therefore they fail to describe the origin of the phenomenological Hofmeister effect. However, given that models considering the basic forces of electrostatic and van der Waals interactions can offer rationalization for the core experimental observations, a universal interaction model stands a chance of being developed. In this perspective, we separately derive the contribution from ion-ion electrostatic interactions and ion-water interactions from second harmonic generation (SHG) data at the air-ion solution interface, which yields an estimate of the ion-water interactions in solution. The Hofmeister ion effect observed for biological solutes in solution should be similarly influenced by contributions from ion-ion and ion-water ...Continue Reading

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Feb 28, 2017·Physical Chemistry Chemical Physics : PCCP·Matthew J DiTucciMartina Havenith
Apr 28, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Saeed Zajforoushan Moghaddam, Esben Thormann
Mar 19, 2021·Physical Chemistry Chemical Physics : PCCP·Mark N KobrakCamiel H C Janssen

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