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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/45003

Title: Specific Ion Effects in Cholesterol Monolayers
Authors: Castillo-Santaella, Teresa
Maldonado-Valderrama, Julia
Faraudo Gener, Jordi
Martín-Molina, Alberto
Issue Date: 2016
Abstract: The interaction of ions with interfaces and, in particular, the high specificity of these interactions to the particular ions considered, are central questions in the field of surface forces. Here we study the effect of different salts (NaI, NaCl, CaCl2 and MgCl2) on monolayers made of cholesterol molecules, both experimentally (surface area vs. lateral pressure isotherms measured by a Langmuir Film Balance) and theoretically (molecular dynamics (MD) all-atomic simulations). We found that surface isotherms depend, both quantitatively and qualitatively, on the nature of the ions by altering the shape and features of the isotherm. In line with the experiments, MD simulations show clear evidences of specific ionic effects and also provide molecular level details on ion specific interactions with cholesterol. More importantly, MD simulations show that the interaction of a particular ion with the surface depends strongly on its counterion, a feature ignored so far in most theories of specific ionic effects in surface forces.
Publisher: MDPI
Keywords: Ionic specificity
Langmuir monolayers
Molecular dynamics simulations
Surface forces
URI: http://hdl.handle.net/10481/45003
ISSN: 1996-1944
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Castillo-Santaella, T. [et al]. A. Specific Ion Effects in Cholesterol Monolayers. Materials 2016, 9, 340. [http://hdl.handle.net/10481/45003]
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