Schwierz, Nadine and Horinek, Dominik and Sivan, Uri and Netz, Roland R. (2016) Reversed Hofmeister series-The rule rather than the exception. CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, 23. pp. 10-18. ISSN 1359-0294, 1879-0399
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Over recent years, the supposedly universal Hofmeister series has been replaced by a diverse spectrum of direct, partially altered and reversed series. This review aims to provide a detailed understanding of the full spectrum by combining results from molecular dynamics simulations, Poisson-Boltzmann theory and AFM experiments. Primary insight into the origin of the Hofmeister series and its reversal is gained from simulation-derived ion-surface interaction potentials at surfaces containing non-polar, polar and charged functional groups for halide anions and alkali cations. In a second step, the detailed microscopic interactions of ions, water and functional surface group's are incorporated into Poisson-Boltzmann theory. This allows us to quantify ion-specific binding affinities to surface groups of varying polarity and charge, and to provide a connection to the-experimentally measured long-ranged electrostatic forces that stabilize colloids, proteins and other particles against precipitation. Based on the stabilizing efficiency, the direct Hofmeister series is obtained for negatively charged hydrophobic surfaces. Hofmeister series reversal is induced by changing the sign of the surface charge from negative to positive, by changing the nature of the functional surface groups from hydrophobic to hydrophilic, by increasing the salt concentration, or by changing the pH. The resulting diverse spectrum reflects that alterations of Hofmeister series are the rule rather than the exception and originate from the variation of ion-surface interactions upon changing surface properties. (C) 2016 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RELATIVE EFFECTIVENESS; ELECTROLYTE-SOLUTIONS; HYDROPHILIC SURFACES; AIR/WATER INTERFACE; POLYSTYRENE LATEX; WATER-STRUCTURE; ION ADSORPTION; STABILITY; PROTEINS; SOLUBILITY; Hofmeister series; Reversal; Surface charge; Salt concentration; Hydrophobicity; pH; Poisson-Boltzmarni theory; Molecular dynamics simulations; AFM |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Dominik Horinek |
| Depositing User: | Petra Gürster |
| Date Deposited: | 02 Sep 2020 07:48 |
| Last Modified: | 02 Sep 2020 07:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2802 |
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