查找使用阿拉丁产品的科研文献

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

Du Wei,Gao Feng,Cui Peng,Yu Zhiwu,Tong Wei,Wang Jihao,Ren Zhuang,Song Chuang,Xu Jiaying,Ma Haifeng,Dang Liyun,Zhang Di,Lu Qingyou,Jiang Jun,Wang Junfeng,Pi Li,Sheng Zhigao,Lu Qingyi

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 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 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.