Formation of Nanofibers by Electrospinning

Chuangchote et aL (2008) fabricated ultrafine poly[2-methoxy-5-(20-ethylhexyloxy)-l,4-phenylenevinylene]/poly(vinyl pynolidone) (PVP) composite fibers for conductive nanofibers by electrospinning blended solutions in a mixed solvent of chlorobenzene and methanol. The average diameter of the eiectrospun fibers was found to decrease with the reduction of the PVP concentration and/or the addition of the volatile organic salt, pyridium formate. 

In addition, Kai Wei and co-workers were also able to tailor the surface area and pore size of the nanofibers simply by changing the blend ratio of the polymers. When the ratio of PAN and PMMA is 7 3, PMMA forms the discontinuous phase and PAN forms the continuous phase. After fiber formation (without change of phase) by electrospinning, the elongated rodlike phase was removed within a single... 

The acetone bath was used for the formation of pure polyaniline fibers by electrospinning method. " The fibres were collected in an acetone bath placed on the collector electrode. Because by placing the acetone bath make the excess of solvent to diffuse into the acetone allowing the pure polyaniline fiber formation. In another study, PANI/silica hybrid nanofiber webs were prepared by using... 

Another thermosetting polymer precursor (PXTC) in the form of aligned nanofiber yam (parallel with the electric field lines), which was several centimeters long, was obtained by electrospinning merely using a conventional flat alimiimnn plate as the collector. The formation of the yam might result from the ionic conduction of PXTC. The presence of... 

Loscertales et a/. prepared the silica nanotubes in a similar way by using tetraethyl orthosilicate (TEOS) as the sheath. Wang et al. recently reported the formation of nanochannels (60 nm or less) in silica nanofibers (Fig. 2.36). They used spin-on glass (SOG) and PVP mixture in the sheath and motor oil in the core. After electrospinning, the structure was calcinated to remove PVP and motor oil and to form Crosshnked SiOj wall. 

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