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SUMMARY:Geometrically frustrated assembly:  Limits of self-limitation - Gr
 egory  Grason (University of Massachusetts)
DTSTART:20230824T090000Z
DTEND:20230824T093000Z
UID:TALK202642@talks.cam.ac.uk
DESCRIPTION:Geometric frustration is most often associated with the disrup
 tion of long-range order and proliferation of defects in the bulk state of
  a self-organizing system. &nbsp\;Soft and self-assembled materials\, on t
 he other hand\, are composed of intrinsically flexible building blocks hel
 d together deformable and non-covalent forces. As such\, soft assemblies s
 ystems are able to tolerate some measure of local misfit due to frustratio
 n\, allowing imperfect order to extend over at least some finite range. Th
 is talk focuses on theoretical frameworks for exploiting geometrically-fru
 strated assemblies (GFAs) to realize size-controlled\, self-limiting assem
 bly. &nbsp\; While concepts of GFA have been used to describe a broad rang
 e of soft matter structures\, from self-twisting protein filament bundles\
 , &nbsp\;chiral membranes\, to spherical shells\, current challenges focus
  on exploiting the scale-dependent thermodynamics of GFA to design and rea
 lize new classes of intentionally ill-fitting assemblies that target equil
 ibrium architectures with well-defined dimensions on length scales that ex
 tend far beyond the size of the building blocks. &nbsp\;In this talk\, I d
 escribe some of the emerging principles and ongoing efforts to engineer th
 e intra-assembly stress propagation and thermodynamic self-limitation in a
 ssemblies through the shape\, interaction and flexibility of those buildin
 g blocks\, as well as recent attempts to develop a statistical mechanical 
 framework to study the influence of finite-temperature and concentration f
 luctuations in GFA.&nbsp\;
LOCATION:External
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