Polyacrylonitrile and Carbon Nanofibers with Controllable Nanoporous Structures by Electrospinning

Abstract

In this work, polyacrylonitrile (PAN) and carbon nanofibers with controllable nanoporous structures were successfully prepared via electrospinning technique. For the preparation of porous PAN nanofibers, two kinds of polymers of PAN and polyvinylpyrrolidone (PVP) were used as electrospun precursor materials, and then the bicomponent nanofibers of PAN and PVP were extracted with water to remove the PVP in the composite polymer nanofibers. By altering the ratio of PAN/PVP in the precursor, the pore size and pore distribution of porous PAN nanofibers could be easily controlled. By using the porous PAN nanofibers as structures directing template and through heat treatment, carbon nanofibers with nanoporous structures were obtained. The porous nanofibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR), differential thermal analyses (DTA), Brunauer–Emmett–Teller (BET) nitrogen adsorption, X‐ray diffraction (XRD), and Raman spectra.magnified image

Hierarchical heterostructures of p-type BiOCl nanosheets on electrospun n-type TiO2 nanofibers with enhanced photocatalytic activity

“…Electrospun nanofibers were chosen as hard templates because they have many advantages in photocatalytic process. The advantages are as follows: (1) their large surface-to-volume ratio enables fast surface photocatalytic reactions and quick mass transfer of active species; (2) the large roughness of their surfaces makes better use of light through multiple reflections; and (3) the large length to diameter ratio also gives favorable sedimentation and recycling characteristic in the photocatalytic applications [19][20][21]. Photocatalytic results show that p-BiOCl/n-TiO 2 HHs exhibit favorable UV-light photocatalytic activity for degradation of Rhodamine B (RB) and reduction of Cr (VI).…”

Recent advancements in metal organic framework based electrodes for supercapacitors

“…Surfactants play a key role in the synthesis of porous materials because they can act as sacrificial templates [87,88]. In the process of synthesizing MOFs, surfactants can be used as a sacrificial template to obtain micropores and mesopores structure.…”

Caracterização no Infravermelho (IV) e Eletrônica de superfície (MEV) de membranas assimétricas à base de Poli (acrilonitrila-co-acetato de vinila)

“…Por exemplo, as bandas do copolímero P(AN-co-AV) são identificadas em 2246 cm -1 , banda associada ao grupo C≡N da acrilonitrila, e em 1235 cm -1 , banda associada ao comonômero acetato de vinila (AV). E as bandas que caracterizam a PVP são encontradas em 1664 cm -1 , banda associada ao grupo carbonila (C=O), e em 1293 cm -1 , associada ao alongamento da ligação (-C-N) [20,21]. Assim sendo, essas bandas estão presentes nos espectros das membranas Mb1 e Mb2 (Fig.…”