title: Clathrate colloidal crystals.
abstract: DNA-programmable assembly has been used to deliberately synthesize hundreds of different colloidal crystals spanning dozens of symmetries, but the complexity of the achieved structures has so far been limited to small unit cells. We assembled DNA-modified triangular bipyramids (~250-nanometer long edge, 177-nanometer short edge) into clathrate architectures. Electron microscopy images revealed that at least three different structures form as large single-domain architectures or as multidomain materials. Ordered assemblies, isostructural to clathrates, were identified with the help of molecular simulations and geometric analysis. These structures are the most sophisticated architectures made via programmable assembly, and their formation can be understood based on the shape of the nanoparticle building blocks and mode of DNA functionalization.
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.|International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208, USA.
authors.forename: Haixin
authors.identifier: 0000-0003-4650-0062
authors.initials: H
authors.lastname: Lin
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Sangmin
authors.identifier: 0000-0002-1145-4708
authors.initials: S
authors.lastname: Lee
authors.affiliation: International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208, USA.|Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
authors.forename: Lin
authors.identifier: 0000-0002-4313-7168
authors.initials: L
authors.lastname: Sun
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Matthew
authors.identifier: 0000-0002-4061-4299
authors.initials: M
authors.lastname: Spellings
authors.affiliation: Institute for Multiscale Simulation, Friedrich-Alexander University Erlangen-Nürnberg, 91058 Erlangen, Germany.
authors.forename: Michael
authors.identifier: 0000-0002-7031-3825
authors.initials: M
authors.lastname: Engel
authors.affiliation: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA. sglotzer@umich.edu chadnano@northwestern.edu.|Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.|Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Sharon C
authors.identifier: 0000-0002-7197-0085
authors.initials: SC
authors.lastname: Glotzer
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, USA. sglotzer@umich.edu chadnano@northwestern.edu.|International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208, USA.|Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
authors.forename: Chad A
authors.identifier: 0000-0002-6634-7627
authors.initials: CA
authors.lastname: Mirkin
mesh_terms: D003102:Colloids; D003460:Crystallization; D004247:DNA / Q000737:chemistry*; D008854:Microscopy, Electron; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*
chemical_list: D003102:Colloids; D004247:DNA