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SUMMARY:Surface Propensity and Electric Fields at the Air/Water Interface:
  Water\, Ions\, and Lipids
DTSTART:20140528T100000
DTSTAMP:20260415T032251Z
UID:9b5cf4b052ad8cf323bc765263673263a0ce78173197b38ea6d6e6c5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Heather Allen\, Ohio State University\, Columbus\, OH (U
 SA)\nBIOENGINEERING SEMINARAbstract:\nElucidating interfacial ion distribu
 tions\, ion surface propensity\, and hydration are of interest for environ
 mental and materials applications including atmospheric aerosol chemistry\
 , thundercloud electrification\, material contamination\, and corrosion pr
 ocesses. Heterodyne detected sum frequency generation (HD-SFG) and convent
 ional vibrational SFG spectroscopies are used to understand anion versus c
 ation air-aqueous interfacial distributions.  Surface potential measureme
 nts also provide surface electric fields as does HD-SFG. Ion valency\, pol
 arizability\, size\, shape\, and identity of the counterion are critical f
 actors in considering ion organization and subsequent changes in interfaci
 al electric field at the air -water interface.  Here a series of mono and
  polyatomic anions and mono and divalent cations are compared using these 
 methods. We observe that while polarizability and size of ions are importa
 nt factors\, hydration effects predominately drive interfacial behaviors. 
 This is exemplified by magnesium and sulfate salt systems. In addition\, w
 ork on phospholipids and fatty acids are also studied using both SFG and B
 rewster angle microscopy (BAM). Head group differences\, especially with r
 egard to hydrogen bonding capability and extent\, are discerning factors f
 or surface organization.Bio:\nProfessor Allen received her B.S. degree in 
 Chemistry in 1993 and Ph.D. in Physical Chemistry in 1997 at the Universit
 y of California Irvine. Her advisors as an undergraduate\, graduate\, and 
 postgraduate were Nobel Laureate F. S. Rowland\, D. Blake\, J. C. Hemminge
 r\, B. J. Finlayson-Pitts\, and G. L. Richmond respectively. As a student 
 and postdoctoral researcher she was awarded several fellowships including 
 Fannie and John Hertz\, EPA\, an NSF Traineeship\, and a NOAA Post-Doctora
 l Fellowship in Climate and Global Change. At Ohio State she has been reco
 gnized for her research accomplishments with a Research Innovation Award f
 rom Research Corp. in 2001\, an NSF CAREER Award in 2002\, a Beckman Young
  Investigator Award in 2003\, an Alfred P. Sloan Research Fellow Award in 
 2005\, a Camille Dreyfus Teacher-Scholar Award in 2006\, and a Fellow of t
 he American Association for the Advancement of Science (AAAS) in 2012. Dr.
  Allen has also been recognized for several mentoring awards over the year
 s including the most recent in 2013\, the American Chemical Society Nation
 al Award for Encouraging Women into Careers in the Chemical Sciences. She 
 is a Full Professor in the Department of Chemistry and Biochemistry and in
  the Department of Pathology\, and her research specialization is in molec
 ular organization at interfaces.
LOCATION:SV1717A http://map.epfl.ch/?room=sv1717a
STATUS:CONFIRMED
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