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Showing 1–3 of 3 results
Advanced filters: Author: Lucian Pirvu Clear advanced filters

  • Knots reduce the tensile strength of macroscopic threads and fibres. Now it has been shown that the presence of a well-defined overhand knot in a polymer chain can substantially increase the rate of scission of the polymer under tension, as deformation of the polymer backbone induced by the tightening knot activates otherwise unreactive covalent bonds.

    • Min Zhang
    • Robert Nixon
    • David A. Leigh
    ResearchOpen Access
    Nature Chemistry
    Volume: 16, P: 1366-1372

  • A molecular strand can be knotted and unknotted into three different topologies, depending on the complexing metal ion used (copper or lanthanide or none).

    • David A. Leigh
    • Fredrik Schaufelberger
    • Julien Segard
    Research
    Nature
    Volume: 584, P: 562-568

  • Reversible nanoscale knotting and unknotting of a molecular strand can be used to control the handedness of helical organizations at macroscopic length scales. Dopant knotted and unknotted strands induce supramolecular helical structures of opposite handedness in achiral liquid crystals, and the left- and right-handed forms can be switched in situ.

    • Nathalie Katsonis
    • Federico Lancia
    • Fredrik Schaufelberger
    Research
    Nature Chemistry
    Volume: 12, P: 939-944