Clathrate colloidal crystals

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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.They 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.

Source: http://science.sciencemag.org/content/355/6328/931

Related paper: Haixin Lin et al.,Clathrate colloidal crystals,Science 355, 931–935 (2017).

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