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Increased Propensity of I-aq(-) for the Water Surface in Non-neutral Solutions: Implications for the Interfacial Behavior of H3Oaq+ and OHaq-
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SYSNO ASEP 0377620 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Increased Propensity of I-aq(-) for the Water Surface in Non-neutral Solutions: Implications for the Interfacial Behavior of H3Oaq+ and OHaq- Author(s) Ottosson, N. (SE)
Cwiklik, Lukasz (UFCH-W) RID, ORCID
Söderström, J. (SE)
Björneholm, O. (SE)
Öhrwall, G. (SE)
Jungwirth, P. (CZ)Source Title Journal of Physical Chemistry Letters. - : American Chemical Society - ISSN 1948-7185
Roč. 2, č. 9 (2011), s. 972-976Number of pages 5 s. Language eng - English Country US - United States Keywords surfaces ; interfaces ; catalysis Subject RIV CF - Physical ; Theoretical Chemistry CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000290372900009 DOI 10.1021/jz2003233 Annotation By a combination of surface-sensitive photoelectron spectroscopy and molecular dynamics simulations, we characterize the surface propensity of the iodide anion in aqueous solutions at acidic, neutral, and basic conditions (pH = 1, 6.8 and 13). In both experiments and simulations, an increased surface concentration of I- is found in non-neutral solutions. We interpret these findings in terms of I- surface coadsorption with hydronium at low pH and "salting out" of iodide by hydroxide from the bulk solution to the surface at high pH. The present study is thus in accord with the picture of a weak surface adsorption of hydronium and surface depletion of hydroxide, being in sharp contradiction with the interpretation of electrophoretic and titration measurements in terms of strong surface enrichment of OH-. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2013
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