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SUMMARY:Nanoscale organisation and dynamics of molecules and ions at the i
 nterface with solids in solution - Dr Kislon Voitchovsky\, Lecturer in Sof
 t Matter and Biological Physics. Durham University
DTSTART:20160422T130000Z
DTEND:20160422T140000Z
UID:TALK64037@talks.cam.ac.uk
CONTACT:Dr. Hernandez-Ainsa
DESCRIPTION:\nAt the interface with solids\, liquid tend to behave differe
 ntly than in bulk. The interaction of the liquid molecules with the solid 
 and their loss of configurational entropy often results in this interfacia
 l liquid being more ordered and less mobile than its bulk counterpart. The
  nanoscale organisation and dynamics of interfacial liquids is key to coun
 tless processes from friction and lubrication to protein function\, hetero
 geneous catalysis\, crystal growth and molecular self-assembly. Experiment
 ally little is know the behaviour of the interfacial liquid at the molecul
 ar level\, partly for lack of technique able to gather in-situ local infor
 mation\, including over inhomogeneous interfaces.\nAtomic force microscopy
  (AFM) can in principle overcome this difficulties and provide sub-nanomet
 re maps of the solvation landscape and the local solid-liquid affinity [1]
 . Because the measurement is dynamical [2] more information can be derived
  about the nanoscale flow of the liquid parallel to the solid.\nHere I pre
 sent studies investigating the unusual behaviour of water at several hard 
 and soft interfaces using a combination of high-resolution AFM and molecul
 ar dynamics simulations. On hard surfaces such as rocks\, hydration water 
 can drive the self-assembly of counter-ions [3]. Single ion-tracking and n
 ano-shearing experiments reveals a dynamics largely dominated by (glassy) 
 hydration water for adsorbed ions at hydrophilic interfaces. Interestingly
 \, similar effects can be seen at soft biological interfaces\, where they 
 may have important implications for the function of the biomolecules.\nInt
 erfacial self-assembly of the liquid itself can also be achieved\, for exa
 mple when using homogenous solutions comprising two pure liquids such as w
 ater and alcohol. The resulting solid-like nanostructures are remarkably s
 table and comprise both types of molecules. These structures can be exploi
 ted for controlled self-assembly and the development of functional interfa
 ces.\n\n[1] K. Voitchovsky\, et al.\, Nature Nanotechnology 5\, 401-405 (2
 010)\n[2] Ortiz-Young et al\, Nature Communications 4 2482 (2013)\n[3] Ric
 ci et al\, Nature Communications 5 4400 (2014)\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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