Nanostructures and surface nanomechanical properties of polyacrylonitrile/graphene oxide composite nanofibers by electrospinning

Abstract

In this work, polyacrylonitrile (PAN)/graphene oxide (GO) composite nanofibers were prepared by a facile compounding and electrospinning processes. A small amount of GO powders were first dispersed in N,N-dimethylformamide by sonication, and then, PAN powders were added to prepare an electrospinning solution. The surface morphology was analyzed by atomic force microscopy and transmission electron microscopy, whereas the chemical properties of the PAN and PAN/GO composite nanofibers were compared by infrared (IR) spectroscopy. Also, lateral force microscopy and force-distance curves (FDC) were employed to investigate the surface properties, such as friction force and elasticity. The experimental results indicate that with increasing GO concentration, the surface friction force and adhesive force increased, so the nanofibers showed promise for applications as supports for enzyme immobilization.

Electrospun PAN–GO composite nanofibers as water purification membranes

“…Figure shows the FTIR spectra of the bare GO, bare PAN, and a series of PAN–GO composites. While the bare GO exhibited several strong vibrational peaks at ∼3200 (OH), ∼1740 (CO), ∼1630 (CC), ∼1226 (CO), and ∼1040 cm −1 (COC), the bare PAN nanofiber membrane showed distinctive peaks at ∼2920, and ∼1450 cm −1 (the asymmetrical and symmetrical bending of CH, respectively), and ∼2240 cm −1 (CN) . As the small amount of GO was physically incorporated into the PAN nanofiber sheets, the detectable characteristic peaks of the combination of GO and PAN were observed from the series of composite membranes, apparently indicating the effective integration of the hydrophilic GO into the PAN nanofibers.…”

“…We speculated that the uniformly incorporated GO throughout the PAN nanofibers could evenly distribute the stress points where the external stress could be translated to the GO to improve the overall stress (i.e., the narrow distribution of the nanofibers), resulting in the enhancement of its mechanical properties . A further increase of the GO content in the membranes decreased the additive effect, which could be caused by the formation of a notably thicker diameter of the nanofibers (e.g., partial aggregation and stacking of GO) and higher pore size of the membrane (a slight reduction in the packing density) . As the enhancement of the mechanical property could be due to the total amount of PAN and GO, the tensile strength of the bare PAN nanofiber membrane prepared with the 10.2 wt % PAN was examined where this small change in the amount of PAN (0.2 wt %) did not influence the stress.…”

Structural reinforcement and failure analysis in composite nanofibers of graphene oxide and gelatin

“…The first attempt to produce polymeric electrospun nanofibres filled with GO dates back to 2010 [28]. Very recently polymers with polar groups, thus capable of interacting with oxygen-containing hydrophilic groups located at the surface of GO -such as poly(vinyl alcohol) [29], poly(acrylonitrile) [30][31][32] and poly(amides) [33] -have been electrospun with GO obtaining mats with remarkably improved mechanical properties. No attempt to prepare electrospun gelatin nanofibers enriched with GO has been reported up to now.…”

Nanolif Yapılı Poli (Akrilonitril-Vinil Asetat)/ Grafen Oksit Yapıların Karakterizasyonu

“…Çözelti viskozitesi, çözelti iletkenliği gibi polimer çözeltisinin parametreleri nanolif yüzey yapısının özelliklerini etkilemektedir. Elektro çekim işlemi esnasında oluşan nanoliflerin yapıları GO, PAN ve çözelti parametrelerinin yanı sıra çözücü olarak kullanılan DMF ile de değişkenlik göstermektedir [9,28]. Karı-şımdaki GO miktarı, çeşitli lif çaplarında ve yapılarda lif elde edilmesini sağlamıştır.…”

“…Enzim etkinliği ve biyoelektrokimya üzerindeki potansiyeli ile PAN/GO nanokompozit üzerine çalışmalar yapılmıştır [9]. Bu çalışma kapsamında Modifiye Hummers yöntemi ile GO sentezlenmiş ve P(AN-VAc) ile karışım oluşturularak elektro çekim sistemi ile P(AN-VAc)/GO nanolifli yüzeyler üretilmiştir.…”