Growth of NiCo2S4 nanotubes on carbon nanofibers for high performance flexible supercapacitors
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Abstract Poly(hydroxybutyrate‐ co ‐hydroxyvalerate) (PHBV) was electrospun into ultrafine fibrous nonwoven mats. Different from the conventional electrospinning process, which involves a positively charged conductive needle and a grounded fiber collector (i.e., positive voltage (PV) electrospinning), pseudo‐negative voltage (NV) electrospinning, which adopted a setup such that the needle was grounded and the fiber collector was positively charged, was investigated for making ultrafine PHBV fibers. For pseudo‐NV electrospinning, the effects of various electrospinning parameters on fiber morphology and diameter were assessed systematically. The average diameters of PHBV fibers electrospun via pseudo‐NVs were compared with those of PHBV fibers electrospun via PVs. With either PV electrospinning or pseudo‐NV electrospinning, the average diameters of electrospun fibers ranged between 500 nm and 4 μm, and they could be controlled by varying the electrospinning parameters. The scientific significance and technological implication of fiber formation by PV electrospinning and pseudo‐NV electrospinning in the field of tissue engineering were discussed. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers
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It is well known that electrospinning is a convenient method of fabricating polymeric nanofiber with a high surface area. Despite the convenience, electrospinning has not been used in practical applications because it has a lower production rate than conventional spinning methods. The lower production rate is caused by the electrospinning solution supplier. Many fabrication methods have been invented to overcome this limitation. For instance, multineedle electrospinning is the easiest way to increase the electrospinning production rate. However, although multineedle electrospinning increases the production rate, the method causes the morphological destruction of electrospun nanofiber because of electrical interference between needles. Herein, we introduce a new fabrication method for mass production of nanofiber based on the electrospinning process. Needleless electrospinning and syringeless electrospinning are introduced in this section. Particularly, the syringeless electrospinning contributes to the green electrospinning because the water-based polymeric solution can be easily used for material. In addition, the basic mechanism and driving force of the processes is also introduced. Furthermore, a way to increase the electrospinning production rate is discussed.
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Abstract Carbon nanofibers prepared via electrospinning and following carbonization are summarized by focusing on the structure and properties in relation to their applications, after a brief review of electrospinning of some polymers. Carbon precursors, pore structure control, improvement in electrical conductivity,and metal loading into carbon nanofibers via electrospinning are discussed from the viewpoint of structure and texture control of carbon.
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PMMA 的 melt electrospinning 被调查。因此获得的平均纤维直径被增加 di-(2-ethylhexyl ) phthalate 减少熔融的 PMMA 的粘性从 34.0 渭 m 归结为 19.7 渭 m，并且它进一步降低了当一个 KCl/ice-water 答案被用作收集媒介时，击倒渭 m 到 4.0。做通过的 PMMA 纤维上的比较研究融化 electrospinning 并且由答案 electrospinning 做被做。答案 electrospinning 能够至于一种纳米尺寸作为小制作很薄的纤维，这被发现，但是比 melt-electrospinning 导致了一个宽得多的纤维直径范围。一般来说，在某程度以内，在收集距离的添加剂或减少的应用电压和数量的增加能产生一条减少的纤维直径并且为 PMMA 纤维改进机械性能由融化 electrospinning。通过 melt-electrospinning 做的 PMMA 纤维的机械性质比由答案 elctropspinning 的那些优异，这也被显示。关键词 PMMA - Melt-electrospinning - 这个工作部分是的答案 electrospinning 财政上由中国(号码 50773054 ) 的国家自然科学基础支持了。
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Abstract Electrospinning has received a lot of attention in recent years because it can create nonwoven nanofiber webs with high surface area and porosity. However, the typical needle and syringe‐based electrospinning systems feature poor productivity that has limited their usefulness in the industrial field. Here, current developments in the creation of nanofibers employing nonconventional electrospinning methods, such as needleless electrospinning and syringeless electrospinning, are examined. These alternate electrospinning techniques, which are dependent on numerous polymer droplets of varied shapes, have the potential to match the productivity required for industry‐scale manufacturing of nanofibers. Additionally, they make it possible to produce nanofibers that are difficult to spin using traditional techniques, like electrospinning of colloidal suspensions.
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A brief introduction to the development of electrospinning is given, and various apparatus to fabricate nanofibres or nanoporous materials are systematically reviewed with emphasis on the vibration electrospinning and melt electrospinning for enlarging electrospinability, siro-electrospinning for mimicking the spinning procedure of a spider, magneto-electrospinning for controlling the instability arising in the electrospinning process and bubble electrospinning for mass production of nanofibres. Electrospinning for producing nanoporous materials and the nano-effect for improving the properties of nanofibres are also introduced.
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Nanofibers play an important role in the field of flexible electronic devices. Electrospinning is a simple and universal technology for preparing ultrafine fibers. However, conventional electrospinning nanofibers are often disordered, which limits their applications in devices that require an array or patterned fiber structure. In this paper, electrospinning is reviewed from the aspects of principle, material, characterization and influencing factors. The optimization method of electrospinning device proposed by researchers in recent years is introduced. The applications of electrospinning and electrospinning nanofibers in flexible electronic devices are summarized. At the same time, the deficiency of electrospinning research and its future development trend were also discussed.
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This study deals with a new combination of alternating current (ac) electrospinning and bubble electrospinning. Research devoted to the combination of these two methods for the preparation of nanofibrous and microfibrous mats has been carried out. The design, construction, and description of bubble electrospinning are described in this article. The final morphologies of the fibrous layers produced by these methods have been compared with other well-known electrospinning methods. The bubble electrospinning and ac electrospinning aspire to become new technologies that could be utilized in various technical areas and tissue-engineering applications.
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