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SUMMARY:Osmosis beyond van't Hoff: molecular views\, osmotic diodes and en
 ergy harvesting - Professor Lyderic Bocquet 
DTSTART:20150612T130000Z
DTEND:20150612T140000Z
UID:TALK58944@talks.cam.ac.uk
CONTACT:Dr Eileen Nugent
DESCRIPTION:Osmosis describes the flow of water across semipermeable membr
 anes powered by the chemical free energy contained in salinity gradients. 
 It is a fundamental transport process for water in all living systems\, an
 d its applications are countless. While osmosis can be expressed fundament
 ally in simple terms via the van’t Hoff ideal gas formula for the osmoti
 c pressure\, it is a subtle phenomenon taking its roots in the interaction
 s occurring at the scale of the membrane nanopores. \n\nIn this talk\, I w
 ill discuss some molecular views of osmosis\, which will be used in variou
 s contexts in order to harvest this powerful transport phenomenon. I will 
 first discuss how specific designs of nanochannels leads to rectification 
 of transport. In particular I will show that beyond ionic diode effects\, 
 one may obtain a rectification of the water transport\, ie of the osmotic 
 pressure. This osmotic diode opens new opportunities for water purificatio
 n and complex flow control in nanochannels. I will then discuss the phenom
 enon of diffusio-osmosis\, which is an interfacially driven transport phen
 omenon allowing for osmotic flow without the need of semi-permeable membra
 nes. Beyond the theoretical descirption of the phenomenon\, I will illustr
 ate these concepts on the basis of various experiments\, in particular usi
 ng individual boron-nitride and carbon nanotubes\, as well as nanochannels
 . Finally\, applications to osmotic energy harvesting will be discussed.\n
 \nReferences :\n# « Nanofluidic osmotic diodes »\, C. Picallo\, S. Grave
 lle\, L. Joly\, E. Charlaix and L. Bocquet\,\nPhysical Review Letters 111 
 244501 (2013)\n# « Giant osmotic energy conversion measured in a single \
 ntransmembrane boron-nitride nanotube »\, A. Siria\, P. Poncharal\, A.-L.
  Biance\, R. Fulcrand\, X. Blase\, S. Purcell\, and L. Bocquet\, Nature 49
 4\, 455-458 (2013)\n# « Osmotic flows through fully permeable nano-channe
 ls »\, C. Lee\, C. Cottin\, A.-L. Biance\, P. Joseph\, L. Bocquet\, and C
 . Ybert\, Physical Review Letters 112\, 244501 (2014) \n\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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