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SUMMARY:Dynamic and Programmable Self-assembly of Micro-rafts at Air-water
  Interface - Wendong Wang (Max Planck Institute for Intelligent Systems)
DTSTART:20170316T130000Z
DTEND:20170316T140000Z
UID:TALK71621@talks.cam.ac.uk
CONTACT:Julius Bier Kirkegaard
DESCRIPTION:Dynamic self-assembled material systems constantly consume ene
 rgy to maintain their spatiotemporal structures and functions. Programmabl
 e self-assembly translates information from individual parts to the collec
 tive whole. Combining dynamic and programmable self-assembly in a single p
 latform opens up the possibilities to investigate both types of self-assem
 bly simultaneously and to explore their synergy. This task is challenging 
 because of the difficulty in finding suitable interactions that are both d
 issipative and programmable. Here we present a dynamic and programmable se
 lf-assembling material system consisting of spinning at air-water interfac
 e circular magnetic micro-rafts of radius 50 µm and with cosinusoidal edg
 e-height profiles. The cosinusoidal edge-height profiles not only create a
  net dissipative capillary repulsion that is sustained by continuous torqu
 e input\, but also enables directional assembly of micro-rafts. We uncover
  the layered arrangement of micro-rafts in the patterns formed by dynamic 
 self-assembly and offer mechanistic insights through a physical model and 
 geometric analysis. Furthermore\, we demonstrate programmable self-assembl
 y and show that a 4-fold rotational symmetry encoded in individual micro-r
 afts translates into 90º bending angles and square-based tiling in the as
 sembled structures of micro-rafts. We anticipate that our dynamic and prog
 rammable material system will serve as a model system for studying non-equ
 ilibrium dynamics and statistical mechanics in the future.
LOCATION:MR14\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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