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SUMMARY:MechE Colloquium: Geometrically frustrated assemblies
DTSTART:20181218T121500
DTEND:20181218T131500
DTSTAMP:20260507T213256Z
UID:61d3d2b804b2167510b377672f0ceced1910b738c2d4e23b9d514a7b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Efi Efrati\, Department of Physics of Complex Systems\, 
 Weizmann Institute of Science\nAbstract:\nUnlike Lego bricks that perfectl
 y assemble next to one another\, in molecular assemblies some misfit is al
 most always present. The molecular constituents thus must distort in order
  to form an aggregate\, resulting in a frustrated assembly. The generation
  of geometric frustration from the intrinsic geometry of the constituents 
 of a material is not only natural and ubiquitous but also leads to a strik
 ing variety of morphologies of ground states and exotic response propertie
 s.\n\nIn this talk\, I will review the notion of cumulative geometric frus
 tration and discuss two distinct examples of geometrically frustrated asse
 mblies: liquid crystals in 2D\, and twisted molecular crystals that form b
 anded spherulites. For liquid crystal\, we will present how to quantify th
 e frustration and give specific examples that exhibit super-extensive elas
 tic energy. Motivated by the twisted crystals observed for a wide variety 
 of organic molecular crystals studied by the Kahr group in NYU\, we study 
 a model of frustrated assembly that in particular conveys the nano-metric 
 pitch length of the constituents to the tens of microns pitch length obser
 ved for the twisted crystalline assemblies.\n\nBio:\nI graduated in 2010 f
 rom the Hebrew University of Jerusalem where I did my Ph.D. under the guid
 ance of Eran Sharon and Raz Kupferman studying frustrated elastic structur
 es. I then moved to the James Franck Institute at the University of Chicag
 o where I was a Simons Postdoctoral fellow. Since 2014 I have been an assi
 stant professor in the Department of Physics of complex systems at the Wei
 zmann institute of Science.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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