%A Xu Yan(闫旭), Miao Yu(于淼), Wen-Peng Han(韩文鹏), Ming-Hao You(犹明浩), Jun-Cheng Zhang(张君诚), Rui-Hua Dong(董瑞华), Hong-Di Zhang(张红娣), Yun-Ze Long(龙云泽) %T Fabrication and formation mechanism of closed-loop fibers by electrospinning with a tip collector %0 Journal Article %D 2016 %J Chin. Phys. B %R 10.1088/1674-1056/25/7/078106 %P 78106-078106 %V 25 %N 7 %U {https://cpb.iphy.ac.cn/CN/abstract/article_118725.shtml} %8 2016-07-05 %X Electrospun nanofibers with designed or controlled structures have drawn much attention. In this study, we report an interesting new closed-loop structure in individual cerium nitrate/polyvinyl alcohol (Ce(NO3)3/PVA) and NaCl/PVA fibers, which are fabricated by electrospinning with a nail collector. The electrospinning parameters such as voltage and Ce(NO3)3 (or NaCl) concentration are examined for the formation of the closed-loop structure. The results suggest that the increase of the spinning voltage or addition of Ce(NO3)3 (or NaCl) is favorable for the formation of the closed-loop structure, and the increase of loop numbers and the decrease of loop size. Further analyses indicate that the formation mechanism of the closed-loop fibers can be predominantly attributed to the Coulomb repulsion in the charged jets.