Speaker
Prof.
Mischa Bonn
(Max Planck Institute for Polymer Research)
Description
At the surface or interface of water, the water
hydrogen-bonded network is abruptly interrupted, conferring
properties on interfacial water different from bulk water.
Owing to its importance for disciplines such as
electrochemistry, atmospheric chemistry and membrane
biophysics, the structure of interfacial water has received
much attention. We elucidate the structure and structural
dynamics of interfacial water using ultrafast
surface-specific sum-frequency generation (SFG) vibrational
spectroscopy. Specifically, for the water-air interface, we
find that the interface is both structurally heterogeneous
[1] and highly dynamical [2,3]. We reveal the nature of the
heterogeneity, find surprisingly rapid inter- and
intramolecular energy transfer processes and quantify the
reorientational dynamics of interfacial water. At the
water-mineral interface, we report a dramatic effect of flow
of water along the mineral surface on the organization of
water at the interface [4].
[1] Hsieh, C.S.; Okuno, M.; Backus, E. H. G.; Hunger, J.;
Nagata, Y.; Bonn, M.. Angew. Chem.-Intern. Ed. 2014, 31,
8146 (VIP paper).
[2] Hsieh, C. S.; Campen, R. K.; M. Okuno; E. H. G.
Backus; Y. Nagata; and M. Bonn, Proc. Nat. Acad. Sci. USA
2013, 110, 18780.
[3] Piatkowski, L.; Zhang, Z.; Backus, E. H. G.; Bakker,
H.J.; Bonn, M., Nature Commun. 2014, 5, 4083.
[4] Lis, D.; Backus, E. H. G.; Hunger, J.; Parekh, S. H.;
Bonn, M., Science 2014, 344, 1138.
