Twisting, untwisting, and retwisting of elastic Co-based nanohelices

Twisting, untwisting, and retwisting of elastic Co-based nanohelices

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Abstract The reversible transformation of a nanohelix is one of the most exquisite and important phenomena in nature.However, nanomaterials usually fail to twist into helical crystals.Considering the irreversibility of the previously The Development of Knowledge Enrichment Books Concerning Ice and Snow Physical Studies for High-School Students studied twisting forces, the reverse process (untwisting) is more difficult to achieve, let alone the retwisting of the untwisted crystalline nanohelices.

Herein, we report a new reciprocal effect between molecular geometry and crystal structure which triggers a twisting-untwisting-retwisting cycle for tri-cobalt salicylate hydroxide hexahydrate.The twisting force stems from competition between the condensation reaction and stacking process, different from the previously reported twisting mechanisms.The A new species and new records of Oxysarcodexia Townsend (Diptera: Sarcophagidae) from Brazil resulting distinct nanohelices give rise to unusual structure elasticity, as reflected in the reversible change of crystal lattice parameters and the mutual transformation between the nanowires and nanohelices.

This study proposes a fresh concept for designing reversible processes and brings a new perspective in crystallography.