Facile Preparation of Porous Inorganic SiO₂ Nanofibrous Membrane by Electrospinning Method

Abstract

We presented a straightforward method to fabricate porous inorganic SiO 2 nanofibrous membrane by one-step calcination of electrospun nanofibers, which encapsulated with carbon nanospheres as template for nanopore generation. The structure, morphology, and composition of the as-spun fibers (PVA/SiO 2 /C) and porous SiO 2 were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The detective results indicated that the carbon nanospheres were uniformly encapsulated inside the PVA/SiO 2 /C nanofibers. After calcination, PVA polymer was removed and high flexible inorganic nanofibrous membrane composed of amorphous SiO 2 was obtained. Simultaneously, carbon nanosphere template was decomposed and uniform nanopores were generated inside the SiO 2 nanofibers. This new method is simple and of low cost and hence is suitable to prepare other porous inorganic nanofibers with high surface area for practical application.

Fabrication of h‐BN/SiO2 Nanofibers Showing High Olefins Productivity in Oxidative Dehydrogenation of Propane

“…According to the above experimental results, we speculated that the existence of BÀ OH species over the h-BN/SiO 2 nanofiber catalyst. Observed absorption band at 950 cm À 1 for the uncalcined catalyst was attributed to the bending vibration of SiÀ OH [34] bond. After calcination, the band weakened considerably.…”

“…The band centered at 1710 cm À 1 was assigned to the stretching vibration peak of C=O, which disappeared after calcination, indicating that organics were effectively removed after calcination. [35] The bands positioned around 1120 and 1078 cm À 1 corresponded to the stretching vibration of SiÀ O, [34] Meanwhile, The bands at 1398 and 811 cm À 1 were ascribed to the in-plane BÀ N stretching vibrations and out-of-plane BÀ NÀ B bending vibrations of h-BN respectively, [36] suggesting the existence of h-BN in the prepared nanofiber catalysts.…”

From 1D Nanofibers to 3D Nanofibrous Aerogels: A Marvellous Evolution of Electrospun SiO2 Nanofibers for Emerging Applications

“…5 b, this was fully reflected in the surface morphology of the obtained porous SNFs, which possessed a hierarchical porous structure of micropores (~ 3 nm) and mesopores (~ 50 nm). Furthermore, other rigid structural materials with specific shapes, such as SiO 2 /TiO 2 spheres and carbon spheres, have also been employed as hard templates to prepare porous SNFs [ 103 , 104 ]. At the same time, it can be noted that the desired pore structure can be controlled by adjusting the size and content of the hard templates [ 105 ].…”