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SUMMARY:Soft Matter Quasicrystals and Their Complex Cousins - Professor Sh
 aron Glotzer\, University of Michigan
DTSTART:20141125T160000Z
DTEND:20141125T170000Z
UID:TALK52952@talks.cam.ac.uk
CONTACT:Sian Bunnage
DESCRIPTION:Quasiperiodic crystals with long range rotational symmetry but
  no translational repeat unit have been known in metallic alloys since the
 y were first reported in 1984. Yet only in the past decade have such compl
 ex structures been reported in soft materials\, comprised of\, e.g.\, poly
 mers\, macromolecules\, nanoparticles and colloids. In nearly all of these
  soft matter systems\, quasiperiodicity is entropically stabilized\, and a
 ny interactions are essentially short range. Interestingly\, despite the f
 act that most metallic quasicrystals exhibit icosahedral symmetry\, no ico
 sahedral quasicrystals have been reported for soft matter systems. Instead
 \, primarily 12-fold rotational symmetries are found\, with recent\, occas
 ional reports of 8-fold\, 10-fold\, 18-fold\, and even 24-fold planar quas
 icrystals.  In his talk\, we discuss common features and unifying principl
 es for the self-assembly of soft matter quasicrystals\, and we present res
 ults for the first icosahedral quasicrystal to be thermodynamically self-a
 ssembled in a computer simulation. This icosahedral quasicrystal is robust
  over a range of parameters\, and is obtained from a single particle type 
 interacting via a short-ranged\, oscillatory pair potential that may be ac
 hievable in systems of colloidal spheres. The icosahedral quasicrystal we 
 report is surrounded in parameter space by clathrates\, important for deep
  sea methane storage\, and other new crystal structures never before repor
 ted in a one-component system.
LOCATION:Wolfson Lecture Theatre\, Department of Chemistry
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