Preparation of Ultra‐Fine Silica Fibers Using Electrospun Poly(Vinyl Alcohol)/Silatrane Composite Fibers as Precursor

Abstract

Ultra‐fine composite fibers made from poly(vinyl alcohol) (PVA)/silatrane, an inexpensive and moisture‐stable silicon‐containing compound, were prepared by a combined sol–gel processing and electrospinning technique with average diameters ranging between 119 and 405 nm. These fibers were subsequently converted to ultrafine silica fibers by calcination treatment, with the aim of producing a silica structure with a high surface area‐to‐mass ratio. Upon calcination at 500°C, the PVA/silica composite fibers were converted into amorphous silica fibers, while calcination of the composite fibers at temperatures ≥700°C resulted in the formation of cristobalite fibers. The average diameter of these silica fibers ranged between 162 and 213 nm.

Fabrication and characterization of novel tentacle-type adsorbent for resolution of chiral drugs

“…As seen here, there is about 10% of total weight loss on PVA-SiO 2 by calciantion from 250 to 485°C. The weight loss can be ascribed to the decomposition of PVA, and is similar to the results reported by other researcher [24,25]. As for samples of β-CD-SiO 2 and β-CD-PVA-SiO 2 , the weight loss was determined to be about 13.5wt% and 53.1wt%, respectively.…”

Optimization of the electrospinning parameters of Mn2O3 and Mn3O4 nanofibers

“…Thus, [M1] solution has a higher viscosity than [M2] solution that lead to an increase in the diameter of the spun fibers. This is explained in view of the viscoelastic force behavior that causes the thinning of the charged jet less likely to occur and as a consequence prevent the jet segment from being stretched by the constant Coulombic repulsion force [28,29]. Accordingly, this results in the onset of the bending instability to occur closer to the collector.…”

Photocatalyst Nanofibers Obtained by Calcination of Organic-Inorganic Hybrids

“…Much attention has been paid to the formation of both organic polymeric nanofibers and inorganic nanofibers using ES (Ramakrishna et al, 2005). Many kinds of inorganic nanofibers (SiO 2 , Al 2 O 3 , ZrO 2 , NiCo 2 O 4 , and so on) have been obtained by calcination of organic-inorganic hybrid precursor nanofibers formed by ES , Chronakis, 2005, Panda & Ramakrishna, 2007, Krissanasaeranee et al, 2008. The formation of TiO 2 nanofibers have been also reported by several research groups.…”