Variable piezoelectricity of electrospun chitin
Reva M. StreetTatyana Dmitriyevna HuseynovaXin XuPrashant ChandrasekaranLin HanWan Y. ShihWei‐Heng ShihCaroline L. Schauer
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Nanofibers have gained much attention because of the large surface area they can provide. Thus, many fabrication methods that produce nanofiber materials have been proposed. Electrospinning is a spinning technique that can use an electric field to continuously and uniformly generate polymer and composite nanofibers. The structure of the electrospinning system can be modified, thus making changes to the structure, and also the alignment of nanofibers. Moreover, the nanofibers can also be treated, modifying the nanofiber structure. This paper thoroughly reviews the efforts to change the configuration of the electrospinning system and the effects of these configurations on the nanofibers. Excellent works in different fields of application that use electrospun nanofibers are also introduced. The studied materials functioned effectively in their application, thereby proving the potential for the future development of electrospinning nanofiber materials.
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Electropsipinning is a simple, but efficient and versatile, technology to produce polymeric nanofibers for diverse applications in both textile and non-textile areas. In this paper, recent research developments in electrospinning and electrospun nanofibers, especially thaose from the Centre for Material and Fiber Innovation, Deakin University, are introduced. Important findings on needleless mass-electrospinning and direct electrospinning of highly-twisted continuous manfiber yarns are presented.
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Electrospinning of nanofibers has emerged as a specialized processing technique for the formation of sub-micron fibers, with high specific surface areas. Electrospinning of Nanofibers in Textiles presents important new research in the dynamic and emerging field of electrospinning and covers all aspects of the technology as used to produce nanofiber
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Chitin nanofibers are prepared from the exoskeleton of crabs and prawns, which have novel applications.
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Electrospinning is recognized as a new processing method to prepare nanofibers by emitting and stretching of polymer solution or melts under the electric field. The electrospun textiles possess many advantages such as small pore size,high surface area,very small and even diameters,and high ratios between lengths to diameter,which endow the electrospun nanofibers a broad application.Presently, the study of electrospinning nanofibers has received much attention around the world.In this paper,the equipments of electrospinning,the basic principles of electrospinning,and the research development of electrospun nanofibers were reviewed.Meanwhile,the applications of the electrospun nanofibers in many fields were introduced.At last,the development directions and foregrounds of the electrospun nanofibers were prospected.
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Abstract This study shows that electrospinning nanofibers onto single microfibers allows for careful tailoring of material properties that may suit a wide variety of applications. The nanofiber‐coated microfibers are created by electrospinning nanofibers alongside a microfiber toward a collector that rotates around the microfiber. This force the nanofibers to be collected around the microfiber, creating a hierarchical structure that can be modified at nano scale. In this study, control of nanofiber diameters, nanofiber alignment, and nanofiber loading was evaluated. It was seen that varying polymer concentration affected the nanofiber diameters, collecting the nanofiber‐coated microfibers at different speeds changed the degree of alignment of the nanofibers and that changing the polymer feeding rate affected the loading density of the nanofibers collected. The carefully designed nanofiber‐coated microfibers have great potential in creation of highly porous materials with tailored properties down to nano scale. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
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Polyaniline / polyethylene oxide( PANI / PEO) nanofiber is prepared by electrospinning,and effects of voltage and receiving distance on diameter of electrospinning PANI / PEO nanofiber are studied and electrospinning parameters are optimized. Parallel nanofiber arrays are prepared by controlling the receiver and orientation arrangement of nanofiber is realized; single nanofiber sensor is prepared by controlling deposition times of electrospinning solution jets and detect on NH3. The result indicates that PANI / PEO nanofiber with diameter of105 nm is prepared when the voltage is 20 k V and the receiving distance is 20 cm,and the PANI / PEO nanofiber sensor prepared under above optimized parameters has good linear response to low concentration NH3 at room temperature.
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Poly(L-lactic acid) (PLLA) fibers were fabricated by electrospinning. The effects of various electrospinning process parameters on the thermal properties, especially the crystallinity of the electrospun fibers were investigated. Thermal analysis of the fibers revealed that they exhibited degree of crystallinity ranging from 23% to 46% while that for the as-received granules was approximately 37%, suggesting that the crystallinity of electrospun PLLA fibres can be controlled by optimizing the electrospinning process. This finding is very important because crystallinity affects polymer properties such as degradation, stiffness, yield stress, modulus and tensile strength, solubility, optical and electrical properties which will in turn affect the behavior of these materials when they are utilized in energy, environment, defense and security applications. The results presented in this paper show that the degree of crystallinity of the electrospun fibers decreased with increasing the polymer solution concentration. Furthermore, an optimum electrospinning voltage at which maximum degree of crystallinity can be obtained was observed. At voltages higher or lower than the optimum electrospinning voltage, the degree of crystallinity will decrease or increase, respectively. The effect of the needle tip to collector distance (NTCD) on the degree of crystallinity follows no predictable and consistent pattern.
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