Meny

Javascript verkar inte påslaget? - Vissa delar av Lunds universitets webbplats fungerar inte optimalt utan javascript, kontrollera din webbläsares inställningar.
Du är här

Increased Propensity of I-aq(-) for the Water Surface in Non-neutral Solutions: Implications for the Interfacial Behavior of H3Oaq+ and OHaq-

Författare:
  • N. Ottosson
  • L. Cwiklik
  • J. Soderstrom
  • O. Bjorneholm
  • Gunnar Öhrwall
  • P. Jungwirth
Publiceringsår: 2011
Språk: Engelska
Sidor: 972-976
Publikation/Tidskrift/Serie: Journal of Physical Chemistry Letters
Volym: 2
Nummer: 9
Dokumenttyp: Artikel
Förlag: American Chemical Society

Sammanfattning

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-.

Disputation

Nyckelord

  • Chemistry

Övriga

Published
Yes
  • ISSN: 1948-7185

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen