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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 carbonized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm
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Fig11: TGA graph of PAN–CNT carbonized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm

Mentions: Figure 11 shows that PAN–CNT carbonized nanofibers after heating at 310 °C residue remaining found to be 60.8283 % i.e. wt loss was 39.1717 % (Yarin et al. 2001). This wt loss is less in case of PAN–CNT carbonized as comparison to PAN–CNT stabilized because of increase in stability in structure (Teraoka 2002; Huang et al. 2003), and removal of nitrogen, water and hydrogen. HCN and another gases and also carbon content increases on carbonization (Zhou and Liu 2010).Fig. 11


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 carbonized 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

Fig11: TGA graph of PAN–CNT carbonized with concentration of CNT 3 wt%, drum speed 2000 rpm, tip to collector distance 15 cm
Mentions: Figure 11 shows that PAN–CNT carbonized nanofibers after heating at 310 °C residue remaining found to be 60.8283 % i.e. wt loss was 39.1717 % (Yarin et al. 2001). This wt loss is less in case of PAN–CNT carbonized as comparison to PAN–CNT stabilized because of increase in stability in structure (Teraoka 2002; Huang et al. 2003), and removal of nitrogen, water and hydrogen. HCN and another gases and also carbon content increases on carbonization (Zhou and Liu 2010).Fig. 11

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