Fabrication and formation mechanism of closed-loop fibers by electrospinning with a tip collector |
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| Affiliation: | 1.Collaborative Innovation Center for Low-Dimensional Nanomaterials & Optoelectronic Devices, College of Physics, Qingdao University, Qingdao 266071, China;2.Department of Mechanical Engineering, Columbia University, New York 10027, USA;3.Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, State Key Laboratory Cultivation Base of New Fiber Materials and Modern Textile, Qingdao University, Qingdao 266071, China |
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| Abstract: | 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(NO_3)_3/PVA) and Na Cl/PVA fibers,which are fabricated by electrospinning with a nail collector. The electrospinning parameters such as voltage and Ce(NO_3)_3(or Na Cl) 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(NO_3)_3(or Na Cl) 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. |
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| Keywords: | electrospinning nail collector closed-loop fiber Coulomb repulsion |
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