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SUMMARY:Selective Adsorption of Ions to Aqueous Interfaces: Towards a Comp
 lete Mechanism
DTSTART:20190509T171500
DTEND:20190509T181500
DTSTAMP:20260916T060150Z
UID:77d735b3084e8cff8bede1dffad3520228fc6a349817018e3ab5a67f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Richard Saykally\nUniversity of California\n \nThe beha
 vior of ions at aqueous interfaces has been a subject of much controversy 
 for over a century. By exploiting the strong charge-transfer-to-solvent (
 CTTS) resonances of selected anions in aqueous electrolytes\, their adsorp
 tion properties have measured by deep UV-SHG spectroscopy methods for both
  air/water and graphene/water interfaces.  Temperature and concentration
  dependences determined by both experiment and computer simulations for th
 e air/water case reveal that the strong interfacial adsorption observed fo
 r weakly hydrated ions is enthalpically driven by hydration forces and imp
 eded by a novel entropy effect(capillary wave suppression). Extension of t
 his approach to the water-graphene interface reveals a surprising similari
 ty to the air-water case\, albiet with very different mechanistic details.
   Our recent development of a broadband  deep UV SFG spectroscopy tech
 nique has produced detailed CTTS spectra of interfacial ions\, for which c
 omparisons with bulk CTTS spectra provide additional new insights. \n \n
 Rizzuto\, A.M.\, Irgen-Gioro\, Shawn\, Eftekhari-Bafrooei\, A.\, Saykally\
 , R. J. "Broadband Deep UV Spectra of Interfacial Aqueous Iodide" J. Phys
 . Chem. Lett.\, 7\, 3882-3885 (2016).\n \nD.E. Otten\, P. Shaffer\, P. G
 eissler\, R.J. Saykally\, Elucidating the Mechanism of Selective Ion Adso
 rption to the Liquid Water Surface\, PNAS 109\, 701(2012).\n \nD. L. McC
 affrey\, S. C. Nguyen\, S. J. Cox\, P. L. Geissler\, H. Weller\, A. P. Ali
 visatos\, and R. J. Saykally\,  Selective adsorption of ions to the grap
 hene-water interface studied by deep UV second harmonic generation spectro
 scopy and theory\, PNAS 114\, 13369(2017).  \n \n 
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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