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Nanofiber Yarns

Bognitzki, M., Frese, X, Steinhart, M., Greiner, A., Wendorff, J.H., Schaper, A., and Hellwig, M., Preparation of Fibers with Nanoscaled Morphologies Electrospimiing of Polymer Blends , Polymer Engineering and Science, 41, 982-989, 2001. [Pg.110]


H. Okuzaki, T. Takahashi, N. Miyajima, Y. Suzuki, and T. Kuwabara, Spontaneous formation of poly(p-phenylenevinylene) nanofiber yarns through electrospinning of a precursor. Macromolecules, 39,4276-4278 (2006). [Pg.204]

Figure 5.9 Nanofiber-yarn production schematic [left]. Twisted nanofiber yarn at [a] 3 and [b] 4.5 m/min take-up velocities. Fiber alignment is clearly extensive [right]. Reprinted with permission from Ref. 157, Copyright 2010, Society of Plastics Engineers. Figure 5.9 Nanofiber-yarn production schematic [left]. Twisted nanofiber yarn at [a] 3 and [b] 4.5 m/min take-up velocities. Fiber alignment is clearly extensive [right]. Reprinted with permission from Ref. 157, Copyright 2010, Society of Plastics Engineers.
Ko F, Gogotsi Y, Ali A, Naguib N, Ye H, Yang G, Li G and WiUs P (2003) Electrospinning of continuous carbon nanotube-filled nanofiber yarns, Adv Mater 15 1161-1165. [Pg.246]

Figure 10.21. Application of two-ring electrodes for producing twisted nanofiber yarns in practice the... Figure 10.21. Application of two-ring electrodes for producing twisted nanofiber yarns in practice the...
Bazbouz M B and Styfios G K (2008) Novel mechanism for spinning continuous twisted composite nanofiber yarns, Eur Polym J 44 1-12. [Pg.343]

Wang X, Zhang K, Zbu M, Yu H, Zhou Z, Chen Y and Hsiao B S (2008) Continuous polymer nanofiber yarns prepared by self-bundling electrospinning method, Po/ /mer 49 2755-2761. [Pg.343]

Relative sizes of nanofiber yarn, spider silk fiber and human hair. [Pg.60]

To the best of our knowledge, there is currently no commercially available continuous nanofiber yarn produced through electrospinning. This is hkely to change in the very near future and will lead to rapid worldwide evaluation of the product for numerous potential applications. This will also lead to evaluation of nanofiber yam properties under real world circumstances and results should indicate where further work is required. [Pg.66]

Although electrospinning is more than a hundred years old and processes for producing elech-ospun nanofiber yarns have existed for more than 60 years, little is known about the mechanical and other properties of nanofibers, and especially their twisted yams. Some recent work has focused on some of the properties of twisted yams of specific polymers, as discussed in Sections 3.4 and 3.5, but many of the unknowns still need to be investigated. [Pg.66]

Quality control methods for nanofiber yam production processes will need to be developed for commercialization purposes, and other new problems, which will also arise once nanofiber yarns are spun on an industrial scale, will have to be dealt with. On a purely aesthetic level, once nanofibers are incorporated into wearable textiles, the question of coloration will arise. This might pose some problems, since fibers with diameters smaller than the optically visible wavelength range are seen through diffraction of light, not reflection, and therefore they usually appear white under normal circumstances. [Pg.67]

Xinsong, L., Chen, Y, Fuqian, S. Apparatus and methods for the preparation of continuous nanofiber yarns , Chinese Patent No. CN 1776033, 2005. [Pg.70]

Yousefzadeh M., Latifi M., Teo W.-E., Amani-Tehran M., and Ramakrishna S., Producing continuous twisted yarn from well-aligned nanofibers by a water vortex. Society of Plastics Engineers [SPE] Plast Res. Online. 2011, DOI 10.1002/spepro.003599. [Pg.267]

Fennessey, S.R, and R.J. Farris. 2004. Fabrication of aligned and molecularly oriented electrospun polyacrylonitrile nanofibers and the mechanical behavior of their twisted yarns. Polymer 45 4217-4225. [Pg.1592]

Hierarchy can be described in analogy to rope (stretched polymer molecules in domains that make up nanofibers, combined to microwhiskers, bundled into fibers that are spun into yarn that is twined to make up the rope). Wood and tendon are biological examples that have six or more hierarchical levels. Compared to these, fiber-reinforced matrix composites made up of simple massive fibers embedded in a metallic, ceramic, or polymer matrix are primitive. Hierarchical inorganic materials, as discussed in Chapter 7, can be made with processes for fractal-like solid products spinodal decomposition, diffusion-limited growth, particle precipitation from the vapor, and percolation. Fractal-like solids have holes and clusters of all sizes and are therefore hierarchical if the interactions... [Pg.342]

Smit et al [30] developed a method which uses an open hquid (water for instance) surface to collect nanofibers. The wet nanofibers are then pulled out of the liquid bath with a rotating drum. Fiber orientation is formed when the nanofibrous mat leaves the bath resulting in a continuous yarn. The scheme of the process can be seen in Figure 10.22 and the yarn formation mechanism from top view can be seen in Figure 10.23. [Pg.319]

A first attempt at organizing collected nanofibers into yam using SEM stubs as collectors was reported by Dalton et al. (2005). A pair of grounded stubs placed 6 cm apart were used as collectors to obtain a quantity of oriented poly(e-caprolactone) (PCL) fibers between them. One of the grounded stubs was rotated at 2500 rpm to obtain samples of nanofibrous yarn 5 cm in length with an average diameter of 4.7 jjim. [Pg.100]

High degrees of fiber alignment have also been obtained by collecting electrospun nanofibers on a liquid surface, and the resulting fiber bundle drawn off as a yarn by a motorized take-up roller operated at 0.05 m/s (Smit et al. 2005). The drawing process results in substantial fiber alignment. [Pg.270]

Twisted yams of PAN nanofibers with twist angles of between 1.1° and 16.8° were prepared, with a denier between 326 and 618 and an average denier of 446. The stress-strain behaviour of the yarns was examined and the modulus, ultimate strength and elongation at the ultimate strength were measured as a function of twist angle. [Pg.51]


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