Nanofiber bundle

SEM and TEM observations indicated that fibers exhibited a skin-core heterogeneity in the skin, carbon layers being oriented predominantly parallel to the fiber surface. PAN-based carbon nanofiber bundles prepared from 10 wt.% PAN/DMF solution added with 5 wt% acetone and 0.01 wt.% dodecylethyldimethylammonium bromide and collected on the rim of the rotating disc covered with A1... 

Figure 2.14 Representative morphologies of (A) as-electrospun PAN nanofiber bundle, (B) stabilized PAN nanofiber bundle, (C) low temperature [1000°C) carbonized PAN nanofiber bundle, and (D] high temperature (2200°C) carbonized PAN nanofiber bundle. Reprinted with permission from Ref. 66. Copyright 2009 Elsevier Ltd.

Zhou Z., Lai C., Zhang L., Qian Y, Hou H., Reneker D. H., and Fong H., Development of carbon nanofibers from aligned electrospun polyacrylonitrile nanofiber bundles and characterization of their microstructural, electrical, and mechanical properties. Polymer, 2009, 50,2999-3006. 

One of the CVD methods that has been developed is the synthesis of vertically aligned nanofiber bundles for specific applications. The synthesis of VACNF arrays were all carried out in horizontal reactors [37]. All the reported products by vertical floating catalyst method were randomly arranged CNFs. There are few reports on aligned CNF bundles synthesized by floating catalyst procedure in vertical reactors [38]. 

Several research efforts have been attempted to prepare the electrospun PAN precursor nanofibers in the form of an aligned nanofiber bundle [50, 98]. The bundle was then tightly wrapped onto a glass rod, so that tension existed in a certain degree during the oxidative stabilization in air. 

Zhou, Z. et al. (2009). Development of Carbon Nanofibers from Ahgned Electrospun Polyacrylonitrile Nanofiber Bundles and Characterization of Their Microstructural, Electrical, and Mechanical Properties. Pot m 50, 2999—3006. 

Figure 13. SEM photos of the cross-sectional surfaces of continuous copolymer nanofiber bundles imidized under tension after glycerol pre-treatment. Copyright 2010 WILEY-VCH, reused with permission...

Nanofiber bundle in cylinder form with microvoids [16] ... 

Development of the following two techniques is the most essential for the construction of hollow nanofiber modules (1) preparation of hollow nanofibers and (2) alignment of many hollow nanofibers, which are sufficient for making a hollow nanofiber bundle. 

An organized network of bundles consisting of a certain amount of nanofibers, several nanometers in width, was observed at the top position, as shown in Figure 15.3a and b. Interesting nanostructures were not observed at the other positions. The heights ofthe top ofthe nanofibers were 2-3 nm. The results indicate... 

Fig. 6.9 Carbon nanostructures obtained from different assembly of graphene sheets (a) graphitic nanofibers, (b) MWCNT and (c) a bundle ofSWCNTs.

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