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Synthesis and characterization of multiwalled CNT-PAN based composite carbon nanofibers via electrospinning.

Kaur N, Kumar V, Dhakate SR - Springerplus (2016)

Bottom Line: Also with stabilization, carbonization and graphitization diameter of nanofiber decreases.XRD results show that degree of graphitization increases on increasing CNT concentration because of additional stresses exerting on the nanofiber surface in the immediate vicinity of CNTs.TGA results shows wt loss decreases as CNT concentration increases in fibers.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Krishna Institute of Engineering and Technology, Ghaziabad, India.

ABSTRACT
Electrospun fibrous membranes find place in diverse applications like sensors, filters, fuel cell membranes, scaffolds for tissue engineering, organic electronics etc. The objectives of present work are to electrospun polyacrylonitrile (PAN) nanofibers and PAN-CNT nanocomposite nanofibers and convert into carbon nanofiber and carbon-CNT composite nanofiber. The work was divided into two parts, development of nanofibers and composite nanofiber. The PAN nanofibers were produced from 9 wt% PAN solution by electrospinning technique. In another case PAN-CNT composite nanofibers were developed from different concentrations of MWCNTs (1-3 wt%) in 9 wt% PAN solution by electrospinning. Both types of nanofibers were undergone through oxidation, stabilization, carbonization and graphitization. At each stage of processing of carbon and carbon-CNT composite nanofibers were characterized by SEM, AFM, TGA and XRD. It was observed that diameter of nanofiber varies with processing parameters such as applied voltage tip to collector distance, flow rate of solution and polymer concentrations etc. while in case of PAN-CNT composite nanofiber diameter decreases with increasing concentration of CNT in PAN solution. Also with stabilization, carbonization and graphitization diameter of nanofiber decreases. SEM images shows that the minimum fiber diameter in case of 3 wt% of CNT solution because as viscosity increases it reduces the phase separation of PAN and solvent and as a consequence increases in the fiber diameter. AFM images shows that surface of film is irregular which give idea about mat type orientation of fibers. XRD results show that degree of graphitization increases on increasing CNT concentration because of additional stresses exerting on the nanofiber surface in the immediate vicinity of CNTs. TGA results shows wt loss decreases as CNT concentration increases in fibers.

No MeSH data available.


Related in: MedlinePlus

TGA graph of PAN–CNT stabilized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm
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Fig10: TGA graph of PAN–CNT stabilized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm

Mentions: Mettle Toledo TGA star system was used for TGA analysis up to 1000 °C temp and rate of 10°/c in the nitrogen atmosphere at flow rat 10 ml/min. Figure 9 shows that in case of 9 wt% concentration PAN copolymer nanofibers after heating at 1000 °C residue remaining found to be 68.158 % i.e. wt loss was 31.842 %. The wt loss in nanofibers is very less which shows stability increase in nano size of fibers. This may be due to the high surface area of nanofibers which provide stability as well as complete stabilization reaction. Figure 10 shows that PAN–CNT stabilized nanofibers after heating at 310 °C residue remaining found to be 21.8283 % i.e. wt loss was 78.1717 %. This wt loss is more as in case of PAN–CNT stabilized. This may be again due to the decrease in fiber size because as concentration of CNT increases, fiber diameter also decrease and surface area increase. This may be due to the high surface area of nanofibers which provide stability as well as complete stabilization reaction.Fig. 9


Synthesis and characterization of multiwalled CNT-PAN based composite carbon nanofibers via electrospinning.

Kaur N, Kumar V, Dhakate SR - Springerplus (2016)

TGA graph of PAN–CNT stabilized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837748&req=5

Fig10: TGA graph of PAN–CNT stabilized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm
Mentions: Mettle Toledo TGA star system was used for TGA analysis up to 1000 °C temp and rate of 10°/c in the nitrogen atmosphere at flow rat 10 ml/min. Figure 9 shows that in case of 9 wt% concentration PAN copolymer nanofibers after heating at 1000 °C residue remaining found to be 68.158 % i.e. wt loss was 31.842 %. The wt loss in nanofibers is very less which shows stability increase in nano size of fibers. This may be due to the high surface area of nanofibers which provide stability as well as complete stabilization reaction. Figure 10 shows that PAN–CNT stabilized nanofibers after heating at 310 °C residue remaining found to be 21.8283 % i.e. wt loss was 78.1717 %. This wt loss is more as in case of PAN–CNT stabilized. This may be again due to the decrease in fiber size because as concentration of CNT increases, fiber diameter also decrease and surface area increase. This may be due to the high surface area of nanofibers which provide stability as well as complete stabilization reaction.Fig. 9

Bottom Line: Also with stabilization, carbonization and graphitization diameter of nanofiber decreases.XRD results show that degree of graphitization increases on increasing CNT concentration because of additional stresses exerting on the nanofiber surface in the immediate vicinity of CNTs.TGA results shows wt loss decreases as CNT concentration increases in fibers.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Krishna Institute of Engineering and Technology, Ghaziabad, India.

ABSTRACT
Electrospun fibrous membranes find place in diverse applications like sensors, filters, fuel cell membranes, scaffolds for tissue engineering, organic electronics etc. The objectives of present work are to electrospun polyacrylonitrile (PAN) nanofibers and PAN-CNT nanocomposite nanofibers and convert into carbon nanofiber and carbon-CNT composite nanofiber. The work was divided into two parts, development of nanofibers and composite nanofiber. The PAN nanofibers were produced from 9 wt% PAN solution by electrospinning technique. In another case PAN-CNT composite nanofibers were developed from different concentrations of MWCNTs (1-3 wt%) in 9 wt% PAN solution by electrospinning. Both types of nanofibers were undergone through oxidation, stabilization, carbonization and graphitization. At each stage of processing of carbon and carbon-CNT composite nanofibers were characterized by SEM, AFM, TGA and XRD. It was observed that diameter of nanofiber varies with processing parameters such as applied voltage tip to collector distance, flow rate of solution and polymer concentrations etc. while in case of PAN-CNT composite nanofiber diameter decreases with increasing concentration of CNT in PAN solution. Also with stabilization, carbonization and graphitization diameter of nanofiber decreases. SEM images shows that the minimum fiber diameter in case of 3 wt% of CNT solution because as viscosity increases it reduces the phase separation of PAN and solvent and as a consequence increases in the fiber diameter. AFM images shows that surface of film is irregular which give idea about mat type orientation of fibers. XRD results show that degree of graphitization increases on increasing CNT concentration because of additional stresses exerting on the nanofiber surface in the immediate vicinity of CNTs. TGA results shows wt loss decreases as CNT concentration increases in fibers.

No MeSH data available.


Related in: MedlinePlus