Square section nanotubes have the smallest possible diameter

From Paper: “Observation of the Smallest nanotube with metal square-cross-section” MJ Lagos, F. Sato, J. Bettini, V. Rodrigues, DS Galvão, D. Ugarte Nature Nanotechnology. The study, coordinated by Professor Daniel Ugarte and Professor Douglas Galvão, identified how silver nanowires deform and finally break. During that process, it was observed the spontaneous formation of structures that are hollow and have a square basis, which is the smallest possible with just four atoms in the cross …

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