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SUMMARY:Diffusion in confined systems - Professor J. Miguel Rubi (Universi
 ty of Barcelona)\, Leverhulme Visiting Professor\, Department of Chemistry
  Imperial College 
DTSTART:20140122T141500Z
DTEND:20140122T151500Z
UID:TALK49510@talks.cam.ac.uk
CONTACT:Aron Cohen
DESCRIPTION:At small scales\, the evolution of the mesoscopic degrees of f
 reedom of a system is frequently influenced by the presence of constraints
 . The case of transport of particles in narrow and tortuous channels where
  the presence of obstacles and irregularities of the boundaries alter thei
 r trajectories is a typical example. Motion of particles in the interior o
 f a living cell or through an ion channel\, diffusion in zeolites and in m
 icrofluidic devices\, and folding of proteins modeled as motion of the sta
 te of the protein through a phase space funnel-like region are cases in wh
 ich the system proceeds in a bounded region. Confinement is a source of co
 ntinuous dynamic changes and consequently of modifications of the transpor
 t properties of a system.\n \nIn many situations\, the geometry of the sys
 tem is such that transport takes place along a preferred direction of moti
 on. Changes in the position and momentum of the particles thus occur mainl
 y along this direction whereas local equilibration is rapidly reached in t
 he transverse directions. Under this circumstance\, transport becomes prac
 tically one-dimensional and one can consider the effect of the tortuosity 
 of the boundaries by introducing entropic barriers. To analyze those situa
 tions\, an entropy-driven diffusion model has been proposed. The model has
  revealed the many peculiarities of transport through entropic barriers\, 
 or entropic transport. \n
LOCATION:Department of Chemistry\, Cambridge\, Unilever lecture theatre
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