Suspensions of octapod-shaped nanocrystals are seen to spontaneously interlock into chains, which in turn aggregate side-by-side to form three-dimensional crystals. The observed hierarchical self-assembly can be explained by the octapod's shape and the solvent-tunable van der Waals interactions.
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Rupich, S., Talapin, D. Interlocked octapods. Nature Mater 10, 815–816 (2011). https://doi.org/10.1038/nmat3158
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DOI: https://doi.org/10.1038/nmat3158