On the Mechanism of the Hofmeister Effect
| Autor: | Edward T. Castellana, Fernando Albertorio, Sho Kataoka, Marc C. Gurau, Paul S. Cremer, Soon-Mi Lim |
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| Rok vydání: | 2004 |
| Předmět: |
Anions
Spectrophotometry Infrared Hofmeister series Surface Properties Stereochemistry Electrolyte Biochemistry London dispersion force Catalysis Ion Colloid and Surface Chemistry Monolayer Amines Alkyl chemistry.chemical_classification Aqueous solution Hydrogen bond Proteins Water Hydrogen Bonding General Chemistry Sodium Compounds chemistry Chemical physics Salts sense organs Hydrophobic and Hydrophilic Interactions |
| Zdroj: | Journal of the American Chemical Society. 126:10522-10523 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Vibrational sum frequency spectroscopy was used to probe fatty amine monolayers spread on various electrolyte solutions. The spectra revealed ion specific changes in both monolayer ordering and water structure with the former following the Hofmeister series. Separate measurements of the surface potential as a function of ion tracked closely to changes in alkyl chain structure, but less closely to changes in water structure. The disruption of the monolayer ordering could be ascribed to the relative ability of the ions to penetrate past the hydrophilic surface of the monolayer's headgroups and into the more hydrophobic portion of the thin film. The corresponding trends observed in the surface water structure showed significant deviations from the Hofmeister series, leading to the conclusion that the changes in surface water structure, often credited with being the origin of Hofmeister effects, are probably not of primary importance. On the other hand, dispersion forces almost certainly play a large role in the order of the Hofmeister series. |
| Databáze: | OpenAIRE |
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