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Nanoparticle Assemblies as a New Form of Matter

Alex Travesset- Iowa State

Thursday, November 9, 2017
  3:40–5 p.m.

Location: Chung Hall 138
  Parking Information

Category: Colloquium

Description: Materials whose fundamental units are nanoparticles, instead of atoms or molecules, are a new form of matter that is gradually emerging as major candidates to solve many of the technological challenges of our century. Those materials display unique structural, dynamical and thermodynamical properties, often reflecting deep underlying geometric and topological constraints. In this colloquia, I will discuss the assembly of these materials into crystals or quasi-crystals, so-called nanoparticle superlattices. I will introduce three successful strategies to induce crystallization into simple and binary lattices: DNA programmable self-assembly, crystallization of nanoparticle neutral (uncharged) polymer brushes by electrostatic phase separation and also, by controlling self-assembly through hydrocarbon and polystyrene capping ligands. I will show that the structure of superlattices follows from considering capping ligands as Skyrmions with vortex textures, which determine the bonding very much like atomic orbitals in lattices of simple atoms. I will also discuss the underlying icosahedral order present in all experimental superlattices reported so far, and discussĀ  a wealth of experimental data and numerical simulations providing confirmation of the theoretical predictions. I will finish with an outlook for this fascinating new materials.

Additional Information:

Open to: General Public
Admission: Free
Sponsor: Physics and Astronomy

Contact Information:
Naveen Reddy