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SUMMARY:Special MechE Colloquium: A water window on complex surfaces
DTSTART:20200514T160000
DTEND:20200514T170000
DTSTAMP:20260408T050339Z
UID:9cf77088d748a7c3a8675fa95c5e418617e2b80aa0afa927377c5c84
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Sylvie Roke\, Laboratory for fundamental BioPhotonics\, 
 School of Engineering\, Interschool Institute of Bioengineering\, EPFL\nAb
 stract:\nChemical surface reactions and transformations at solid/liquid in
 terfaces depend strongly on the local electrostatic interfacial environmen
 t as well as on nano- and microscale structures\, structural heterogeneiti
 es\, and confinement. Characterizing these processes is a challenge and fu
 ndamental interface characterization is traditionally done on well-defined
  planar model systems. How far such studies still are from providing molec
 ular level information from realistic systems is a relevant question both 
 from a fundamental and technological perspective. Here I will present adva
 ncements in nonlinear optical technology as a solution that allows the cha
 racterization of not only interfacial structure\, but also dynamics as wel
 l as the quantification of electrostatic potential landscapes in real time
  and space using water as a probe. I will focus on wide-field second harmo
 nic (SH) microscopy to image in 3D and on millisecond time scales the inte
 rfacial structure\, surface potential and dynamics of the curved inside of
  a water/glass micro-capillary interface. We provide real time information
  about the local chemical environment and derive electrostatic surface pot
 ential maps as well as real-time spatially resolved surface acid dissociat
 ion constant pKa\,s values for the silica deprotonation reaction.  Finall
 y\, we conclude that although mean field models can provide insights into 
 the behavior of complex interfaces\, they only do so when the time and len
 gth scales of the probes are long enough.\n\nBio:\nSylvie Roke is a full p
 rofessor at EPFL. She obtained master degrees in chemistry (2000) and phys
 ics (2000) from Utrecht University (NL) with highest honors\, and then obt
 ained a PhD degree (2004\, highest honors) from Leiden University with AW 
 Kleyn and M Bonn. She was Max-Planck free floating Group Leader at the MPI
  for Metals Research in Stuttgart (2006-2012)\, and became director of the
  Laboratory for fundamental BioPhotonics at EPFL in 2011\, where she holds
  the Julia Jacobi chair in photomedicine. Her work focuses on developing n
 ew optical tools and theories for gaining molecular level insight into aqu
 eous systems and interfaces. She applies them to understand water\, aqueou
 s solutions\, realistic interfaces and biological systems. She was awarded
  the LJ Oosterhoff prize (2003)\, the Minerva prize (2006)\, the Hertha-Sp
 oner prize (2008)\, as well as ERC Startup (2009)\, Consolidator (2014) an
 d Proof of Concept (2020) grants.
LOCATION:Zoom webinar https://epfl.zoom.us/j/93273474344
STATUS:CONFIRMED
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