Stabilization, Carbonization, and Characterization of PAN Precursor Webs Processed by Electrospinning Technique

Cho, Chae-Wook; Cho, Donghwan; Ko, Young-Gwang; Kwon, Oh-Hyeong; Kang, Inn‐Kyu

doi:10.5714/cl.2007.8.4.313

Cited by 28 publications

(26 citation statements)

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“…For the polymeric nanofibrous membranes, the strong absorption peak located in the 2260 cm −1 , which was characteristic of a nitrile group C≡N, has completely disappeared after the carbonization process. It has been found that the peak intensity at 2243 cm −1 was largely decreased due to the nitrile groups, which was converted to C=N during the cyclization step to form conjugated groups, depending on the extent of the stabilization process [7]. The shoulder like peak at 1000 cm -1 , 1500 cm -1 are due to the (C=C, C=N, N=H mixed).…”

Section: Resultsmentioning

confidence: 99%

“…In the final stage of the nonwoven membranes production the stabilized mats were carbonized at 1000°C in the inert Argon atmosphere. During carbonization, the carbon content has increased by at least 63 wt.% that is shown in Table 1 and formation of three dimensional carbonaceous structures with different percentages of (Ca, P) elements as a result of HA addition [7,12].…”

Section: Resultsmentioning

confidence: 99%

“…Electro spinning of poly acrylonitrile (PAN) nano fibers: The different concentrations of PAN solution were (3,5,7,12 wt.%), they were loaded into a plastic syringe (10 mL). The electro spinning apparatus consisted of high voltage supply, a syringe infusion pump and a ground electrode "drum" as collector.…”

Section: Methodsmentioning

confidence: 99%

“…The stabilization process was done by heating the prepared polymeric nanofibers at a rate of 1.0°C/min from room temperature to 250°C, and then they were incubated at 250°C for 2 hours at air atmosphere [3]. This was followed by a carbonization step, which took place at 1000°C for 1 hour under Ar gas with heating rate of 5°C/min [7][8][9].…”

Section: Preparation Of Carbon Nano Fibers (Cnfs)mentioning

confidence: 99%

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Study of In vitro Bioactivity and Biodegradability of the Hydrothermally Prepared Carbon Nanofibrous/Hydroxyapatite (Cnf/Ha) Membranes.

A¹,

Maghraby²,

Kandil³

2017

J Bone Res

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Critical size bone defects are orthopedic defects that will not heal without intervention or that will not completely heal over the natural life time of the animal. Although bone generally has the ability to regenerate completely however, critical defects need sort of scaffold to do so. In the current study, we proposed a method to get a Carbon NanoFibrous (CNFs) / Hydroxyapatite (HA) bioactive scaffold. The CNF nonwoven fabrics were obtained by the use of the electrospinning process of the polymeric solution of Poly Acrylonitrile (PAN) and next thermal treatment of both stabilization and carbonization processes, then the CNFs membranes were functionalized by (6.8 wt.%) HA by the hydrothermal process (130ºC for 90 min). The prepared membranes were in-vitro tested for bioactivity in Simulated Body Fluid (SBF) solution and for biodegradability in Phosphate Buffer Saline (PBS) solution. We have successfully prepared a bioactive and biodegradable membrane by immersing it in SBF and PBS solutions respectively for 14 days, where a bioactive layer of Hydroxy-Carbonated Apatite (HCA) was found on its surface. The formed layer of HCA has been characterized by XRD, FTIR, and SEM. The biodegradability of the membranes has been characterized by FTIR, SEM, and ICP for the PBS solution after different time intervals (1, 3, 5, 7 and 14) days. The membrane of (CNF/6%HA) is more biodegradable than other membranes of (CNF, and CNF/8%HA) (Figure 1).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Carbon Nano Fibers (Cnfs)mentioning

confidence: 99%

See 2 more Smart Citations

Study of In vitro Bioactivity and Biodegradability of the Hydrothermally Prepared Carbon Nanofibrous/Hydroxyapatite (Cnf/Ha) Membranes.

A¹,

Maghraby²,

Kandil³

2017

J Bone Res

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“…Stabilization is the first step of the carbon fiber processing and plays a key role on the formation of the structural basis of PAN to be converted in high‐performance materials . The heat treatment is usually made in the region between 200 and 300 °C . Some researchers pointed out temperatures over 300 °C to stabilize PAN, but the environmental conditions and mainly molecular structure of the precursor must be carefully considered to avoid excessive degradation …”

Section: Introductionmentioning

confidence: 99%

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

Oliveira

Rodrigues

Marcuzzo

et al. 2017

J of Applied Polymer Sci

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A systematic study using design of experiments was applied in order to map out the thermal stabilization of electrospun polyacrylonitrile mats and to investigate how oxidation and cyclization reactions are affected by rate, temperature, and time in an oxidative environment. Cyclization indexes were estimated by a simple methodology based on differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy data. Values of enthalpy and relative intensities of bands assigned to CN and CN bonds were used on calculation. The statistical planning applied in this study was important to show that not always longest treatment is effective to stabilize polyacrylonitrile, but also samples obtained in less than 3 h presented low values of exothermic peak on DSC, values of cyclization indexes near to 90%, both from DSC and Fourier transform infrared spectroscopy techniques, reduced weight loss in thermogravimetric analysis and O/C ratio higher than 10% by X‐ray photoelectron spectroscopy, that are appreciated characteristics to a precursor of high‐performance carbon materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45458.

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A Flexible Oxygenated Carbographite Nanofilamentous Buckypaper as an Amphiphilic Membrane

Homaeigohar

Strunskus

Strobel

et al. 2018

Adv Materials Inter

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Here, for the first time, oxygenated amorphous carbon/graphite (a‐COx/G) hybrid nanofilaments are produced and used as the building blocks of a buckypaper membrane. The nanofilaments are in fact the innovatively chopped version of brittle, highly graphitized polyacrylonitrile precursor nanofibers. The high temperature (1250 °C) graphitization and then fast cooling bring about biphasic nanofibers made of graphite and amorphous carbon, readily reoxidized during cooling. The combination of polar and nonpolar domains in the nanofilaments governs a desirable amphiphilicity, thus selectivity to a variety of polar/nonpolar water pollutants. Through electrostatic and π–π interactions, the membrane efficiently discriminates amphiphilic castor oil as well as cationic methylene blue dye from water. Moreover, the buckypaper‐like structure of the membrane is 100% efficient in depth filtration of colloidal particles from water. The membrane's water flux is 16 times higher than that of commercial microfiltration membranes, promising an advanced energy/cost efficient filtration process. Thus, being multispectrally selective and highly water permeable, the a‐COx/G nanofilamentous membrane is regarded potentially a next‐generation, cost‐effective, and sustainable alternative to the long‐existing thin‐film composite membranes for water treatment.

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Stabilization, Carbonization, and Characterization of PAN Precursor Webs Processed by Electrospinning Technique

Cited by 28 publications

References 0 publications

Study of In vitro Bioactivity and Biodegradability of the Hydrothermally Prepared Carbon Nanofibrous/Hydroxyapatite (Cnf/Ha) Membranes.

Study of In vitro Bioactivity and Biodegradability of the Hydrothermally Prepared Carbon Nanofibrous/Hydroxyapatite (Cnf/Ha) Membranes.

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

A Flexible Oxygenated Carbographite Nanofilamentous Buckypaper as an Amphiphilic Membrane

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