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SUMMARY:Selective adsorption of ions to aqueous interfaces and its effects
  on evaporation rates - Professor Richard Saykally (University of Californ
 ia\, Berkeley)
DTSTART:20121114T141500Z
DTEND:20121114T151500Z
UID:TALK39966@talks.cam.ac.uk
CONTACT:Aron Cohen
DESCRIPTION:By exploiting the strong charge-transfer-to-solvent (CTTS) res
 onances of selected anions in aqueous electrolytes\, their interfacial ads
 orption properties are measured by UV-SHG spectroscopy.  Temperature and c
 oncentration dependences are determined\, with the goal of establishing a 
 molecular description of selective ion adsorption. A study of thiocyanate 
 reveals that its strong adsorption is driven by hydration forces and imped
 ed by a novel entropy effect. A study of nitrite indicates adsorption as a
 n ion pair with sodium. Evaporation rates are measured by combining liquid
  microjet technology and Raman thermometry.  The relationship between surf
 ace propensities of ions and evaporation rates is investigated.  A detaile
 d molecular mechanism for both selective ion adsorption and aqueous evapor
 ation is explored.\n\n* W. S. Drisdell\, R. J. Saykally\, R. C. Cohen "Eff
 ect of Surface Active Ions on the Rate of Water Evaporation"\, _J. Phys. C
 hem. C_ *114*\, 11880 (2010).\n\n* D.E. Otten\, P. Shaffer\, P. Geissler\,
  R.J. Saykally "Elucidating the Mechanism of Selective Ion Adsorption to t
 he Liguid Water Surface"\, _PNAS_ *109*\, 701 (2012).\n\n* D. E. Otten\, R
 . Onorato\, R. Michaels\, J. Goodknight\, R. J. Saykally "Strong Surface A
 dsorption of Aqueous Sodium Nitrite as an Ion Pair"\, _Chem. Phys. Lett._ 
 *519*\, 45 (2012). 
LOCATION:Department of Chemistry\, Cambridge\, Pfizer lecture theatre
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