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Programmable Colloidal Self-Assembly with DNA-Coated Colloids

Speaker: David Pine, New York University
Series: CBE Departmental Seminars
Location: Elgin Room (E-Quad A224)
Date/Time: Wednesday, March 14, 2018, 4:00 p.m. - 5:00 p.m.

Particles can be coated with one or more DNA “sticky ends” that can be programmed to hybridize at different temperatures.  Particles can be either uniformly coated with DNA or coated on well-defined patches with different "valence".  Of these, valence 2, which form chains, and valence 4, which coordinate tetrahedrally, are particular interesting.  In addition, we also make Janus particles with varying patch size.  Using these different particles, we demonstrate how to make new crystal structures, including diamond and pyrochlore, new surfactant-like micelle structures like chains and lamellae, and new crystal transformations, including thermally-reversible face-centered cubic to cesium chloride crystals and other transformations.