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SUMMARY:IGM Colloquium: Prof. Efi Efrati\, Weizmann Institute of Science\,
  ISR
DTSTART:20181218T121500
DTEND:20181218T131500
DTSTAMP:20260928T203104Z
UID:eb2a786871472bb41eee9b14bcfd05e268d87b6562ee0d8bd1c7db80
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Efi Efrati\, http://www.weizmann.ac.il/complex/efrati/\n
 Geometrically frustrated assemblies\n\nAbstract:\nUnlike Lego bricks that 
 perfectly assemble next to one another\, in molecular assemblies some misf
 it is almost always present. The molecular constituents thus must distort 
 in order to form an aggregate\, resulting in a frustrated assembly. The ge
 neration of geometric frustration from the intrinsic geometry of the const
 ituents of a material is not only natural and ubiquitous but also leads to
  a striking variety of morphologies of ground states and exotic response p
 roperties.\nIn this talk\, I will review the notion of cumulative geometri
 c frustration and discuss two distinct examples of geometrically frustrate
 d assemblies: liquid crystals in 2D\, and twisted molecular crystals that 
 form banded spherulites. For liquid crystal\, we will present how to quant
 ify the frustration and give specific examples that exhibit super-extensiv
 e elastic energy. Motivated by the twisted crystals observed for a wide va
 riety of organic molecular crystals studied by the Kahr group in NYU\, we 
 study a model of frustrated assembly that in particular conveys the nano-m
 etric pitch length of the constituents to the tens of microns pitch length
  observed for the twisted crystalline assemblies.\n\nBio:\nI graduated in 
 2010 from the Hebrew university of Jerusalem where I did my Ph.D. under th
 e guidance of Eran Sharon and Raz Kupferman studying frustrated elastic st
 ructures. I then moved to the James Franck Institute at the University of 
 Chicago where I was a Simons Postdoctoral fellow. Since 2014 I have been a
 n assistant professor in the department of Physics of complex systems at t
 he Weizmann institute of Science.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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