A statistical approach to evaluate the oxidative process of electrospun polyacrylonitrile ultrathin fibers

Oliveira, Mauro Santos de; Rodrigues, Bruno V. M.; Marcuzzo, Jossano Saldanha; Guerrini, Lília M.; Baldan, Maurício Ribeiro; Rezende, Mirabel Cerqueira

doi:10.1002/app.45458

Cited by 15 publications

(18 citation statements)

References 37 publications

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“…In order to propose an alternative route to increase the low porosity presented by BP, this work introduces a new concept of high porous BP using electrospun polyacrylonitrile (PAN) nanofiber as sacrificial material. The electro-spinning technique is a cost-effective, simple, and fast process that allows to electrospun a wide range of polymers [ 23 , 24 , 25 , 26 , 27 ]. Also, the diameter of the fibers can vary from a few nanometers to a few micrometers and the fiber length can be several centimeters to several meters only by varying the polymer employed and the parameters of process, such as concentration of polymer solution, working distance, collector rotation, infusion rate, and electrical potential [ 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Highly porous multiwalled carbon nanotube buckypaper using electrospun polyacrylonitrile nanofiber as a sacrificial material

Corredor

Ardila-Rodríguez

Diniz

et al. 2019

Heliyon

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Polyacrylonitrile (PAN) was solubilized in N,N-dimethyl formamide (DMF) and the electrospinning process has been employed to obtain PAN nanofibers (PF). Multiwalled carbon nanotubes (MWCNT) were dispersed with the aid of Triton X-100 surfactant and subsequently centrifugated. Buckypapers (BP/PF) were prepared by vacuum filtration procedure of MWCNT suspension supernatant stacking four PF layers over a nylon membrane. The PF removal was carried out by immersing the BP/PF system in DMF and removal periods of 10 and 30 min were evaluated. Scanning electron microscopy (SEM) has not shown any PAN residue in the MWCNT network resulting in highly porous BP. However, by Fourier transform infrared spectroscopy (FT-IR) a PAN band was found around of 2243 cm−1 corresponding to nitrile group (C≡N). Besides, PAN leftover was evidenced by thermogravimetric analysis (TGA), high-resolution transmission electron microscopy (HR-TEM), electrical characterization through four-point probe, nitrogen adsorption at 77 K, and X-ray diffraction (XRD).

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Section: Introductionmentioning

confidence: 99%

Highly porous multiwalled carbon nanotube buckypaper using electrospun polyacrylonitrile nanofiber as a sacrificial material

Corredor

Ardila-Rodríguez

Diniz

et al. 2019

Heliyon

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“…Fixing the samples, however, is not easy. If only two opposite sides are fixed by a weight, e.g., the other sides will shrink [25,26]. If all sides are fixed, the samples can break even at low heating rates since the forces working on the nanofiber mat are not well distributed [27,28].…”

Section: Introductionmentioning

confidence: 99%

Fixing PAN Nanofiber Mats during Stabilization for Carbonization and Creating Novel Metal/Carbon Composites

et al. 2018

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Polyacrylonitrile (PAN) is one of the materials most often used for carbonization. PAN nanofiber mats, created by electrospinning, are an especially interesting source to gain carbon nanofibers. A well-known problem in this process is fixing the PAN nanofiber mats during the stabilization process which is necessary to avoid contraction of the fibers, correlated with an undesired increase in the diameter and undesired bending. Fixing this issue typically results in breaks in the nanofiber mats if the tension is too high, or it is not strong enough to keep the fibers as straight as in the original state. This article suggests a novel method to overcome this problem by electrospinning on an aluminum substrate on which the nanofiber mat adheres rigidly, stabilizing the composite and carbonizing afterwards either with or without the aluminum substrate to gain either a pure carbon nanofiber mat or a metal/carbon composite.

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“…In addition, the shape of fi bres can be strongly deformed from thin, straight nanofi bres to thicker, shorter and meandering fi bres [24,25]. Typically, this problem is solved with mechanical solutions [13,[25][26][27]. In previous research, PAN/ ZnO nanofi brous mats resulted in signifi cantly thicker fi bres which were nearly unmodifi ed by stabilisation and carbonisation without any mechanical fi xing [28], while a similar amount of TiO 2 in the PAN spinning solution did not signifi cantly modify the nanofi bres aft er electrospinning and thermal post-treatments [24].…”

Section: Introductionmentioning

confidence: 99%

Chemical and Morphological Modification of PAN Nanofibrous Mats with Addition of Casein after

Diestelhorst¹,

Mance²,

Mamun³

et al. 2020

TEK

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Electrospun polyacrylonitrile (PAN) nanofi brous mats belong to typical precursor materials of carbon nanofibres. They have, however, the problem that they need to be fi xed or even stretched during stabilisation and ideally also during carbonisation in order to avoid undesired conglutinations and deformations of the original nanofi bre morphology, resulting in brittle behaviour of the macroscopic nanofi brous mat, which impedes several applications. In an earlier investigation, blending PAN with ZnO was shown to increase fi bre diameters and lead to unproblematic stabilisation and carbonisation of nanofi brous mats. ZnO, on the other hand, may have a negative impact on biotechnological applications such as tissue engineering. Here, we thus report on the morphological and chemical modifi cations due to blending PAN electrospinning solutions with diff erent amounts of casein. By optimising the PAN : casein ratio, relatively thick, straight nanofibres are obtained, which can be stabilised and carbonised unambiguously, without the well-known negative impact on cell adhesion due to the addition of ZnO.Elektropredene nanovlaknate koprene iz poliakrilonitrila (PAN) predstavljajo tipične prekurzorje za izdelavo ogljikovih nanovlaken. Med stabilizacijo in po možnosti tudi med karbonizacijo morajo biti pritrjene, da bi lahko preprečili neželeno zlepljenje in deformacijo prvotne nanovlaknate oblike, ki vodi v krhkost makroskopske nanovlaknate koprene in zmanjša možnosti njene uporabe. V predhodni raziskavi je bilo ugotovljeno, da mešanje PAN z ZnO vpliva na povečanje premera vlaken in omogoči stabilizacijo ter karbonizacijo nanovlaknatih kopren. ZnO pa lahko po drugi strani negativno vpliva na biotehnološke aplikacije, kot je tkivni inženiring. V članku so zato predstavljene morfološke in kemijske modifi kacije, ki so bile dosežene z uporabo predilnih raztopin za elektropredenje PAN z dodatkom različnih količin kazeina. Z optimizacijo razmerja PAN : kazein dobimo relativno debela, ravna nanovlakna, ki jih je moč stabilizirati in karbonizirati, brez da bi zaradi dodatka ZnO prišlo do dobro znanega negativnega vpliva na celično adhezijo.

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A statistical approach to evaluate the oxidative process of electrospun polyacrylonitrile ultrathin fibers

Cited by 15 publications

References 37 publications

Highly porous multiwalled carbon nanotube buckypaper using electrospun polyacrylonitrile nanofiber as a sacrificial material

Highly porous multiwalled carbon nanotube buckypaper using electrospun polyacrylonitrile nanofiber as a sacrificial material

Fixing PAN Nanofiber Mats during Stabilization for Carbonization and Creating Novel Metal/Carbon Composites

Chemical and Morphological Modification of PAN Nanofibrous Mats with Addition of Casein after

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