The functionalization and characterization of multi-walled carbon nanotubes (MWCNTs)

Abdullah, Mohd Pauzi; Zulkepli, Siti Aminah

doi:10.1063/1.4931312

Cited by 13 publications

(8 citation statements)

References 14 publications

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“…The interplanar spacing of (002) was calculated to be about 0.33 nm from the Bragg equation. CNTs had an XRD structure similar to that of GR, and the interplanar spacing of (002) was about 0.34 nm. , …”

Section: Resultsmentioning

confidence: 93%

“…CNTs had an XRD structure similar to that of GR, and the interplanar spacing of (002) was about 0.34 nm. 34,35 Figure 2 shows morphologies of the CNTs-GR-PR with different mass ratios of CNTs to GR and the total carbon content. When the total carbon content was 8 wt %, for the CNT 4 -GR 4 -PR (Figure 2a and b), it was observed that CNTs, GR, and PR were uniformly mixed together.…”

Section: Resultsmentioning

confidence: 99%

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Synergistic Effects of Carbon Nanotubes on Negative Dielectric Properties of Graphene-Phenolic Resin Composites

Yin

Zhang

et al. 2017

J. Phys. Chem. C

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Carbon nanotubes-graphene-phenolic resin (CNTs-GR-PR) composites are first prepared to investigate the effects of CNTs on negative dielectric properties of GR-PR composites. The results show that microstructures are easily adjusted by the mass ratio of CNTs to GR and total carbon content, which have an impact on the negative dielectric properties of the composites. The negative permittivity from the CNT 1.6 -GR 5 -PR is observed with the total carbon content of 6.6 wt %, attributed to the formation of conductive pathways. Yet the permittivity of the GR 6.6 -PR still remains positive, indicating that the addition of CNTs is beneficial to the appearance of negative permittivity and shows the synergistic effect. When the total carbon content exceeds 6.6 wt %, the addition of an appropriate amount of CNTs (the mass ratio of CNTs to GR is 0.33:1 and 1:1) improves the alternating conductivity (σ ac ) and imaginary permittivity (ε″), resulting from the connectivity improvement in conductive phases. As compared to the dielectric loss tangent (tan δ) from the GR 8 -PR (below 35), the tan δ of CNT 4 -GR 4 -PR is higher over the whole frequency and above 100 before 400 MHz, indicating the appropriate addition of CNTs enhances the dielectric loss.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Synergistic Effects of Carbon Nanotubes on Negative Dielectric Properties of Graphene-Phenolic Resin Composites

Yin

Zhang

et al. 2017

J. Phys. Chem. C

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“…Similar behavior was observed by Wang et al [ 53 ] He functionalization improved peak intensity, possibly due to the increase in the degree of crystallinity. [ 54 ] Das et al [ 55 ] indicated that acid treatments improve the crystallinity of carbon nanotubes due to the elimination of amorphous carbon.…”

Section: Resultsmentioning

confidence: 99%

Electrical nanocomposites of PA6/ABS/ABS‐MA reinforced with carbon nanotubes (MWCNTf) for antistatic packaging

et al. 2022

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Herein, we prepared toughened and electrical nanocomposites of polyamide 6 (PA6)/acrylonitrile‐butadiene‐styrene (ABS) compatibilized with maleic anhydride‐grafted acrylonitrile‐butadiene‐styrene (ABS‐MA). Functionalized multi‐walled carbon nanotubes (MWCNTf) were used as conductive nanofillers. Nanocomposites were processed in an internal mixer and injection molded. Torque rheometry, impact strength, elastic modulus, heat deflection temperature (HDT), differential exploratory calorimetry (DSC), melting and crystallization kinetic curves, electrical conductivity, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were evaluated. Torque increased with the MWCNTf content in the PA6/ABS/ABS‐MA/MWCNTf nanocomposites, suggesting an increase in viscosity. The MWCNTf were well dispersed in the nanocomposites, generating an electrical percolation path. The impact strength of the PA6/ABS/ABS‐MA/MWCNTf nanocomposites was superior to that of pure PA6, indicating improved flexibility and toughness. The addition of 1 pcr of MWCNTf in the PA6/ABS/ABS‐MA system was sufficient for antistatic application, with a 221% higher impact strength, compared to pure PA6. The DSC studies showed that the crystallization temperature of the nanocomposites shifted to higher temperatures. This was due to the MWCNTf that accelerated crystallization. Additionally, the nanocomposites HDT increased by 20°C compared to the PA6 matrix, suggesting a superior thermomechanical strength. The developed nanocomposites show improved mechanical, electrical, and thermomechanical properties. Therefore, they exhibit great technological potential for application in antistatic packaging.

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“…A study of the morphological characteristics of as-received MWCNTs was performed by HRTEM. Due to their strong tendencies to form bundles and aggregate together, their examination and characterization is difficult [39]. To solve this problem, a homogeneous suspension of a small amount of carbon nanotubes in ethanol was produced by ultrasonic stirring for 5 min.…”

Section: Microstructural Characterization Of Raw Materialsmentioning

confidence: 99%

“…On the one hand, nanotubes act as a process control agent by attaching to the surface of the particles, limiting cold welding and subsequently favouring more intense plastic deformation of the particles. On the other hand, MWCNTs are incorporated into the particles, producing a harder surface after each impact from the milling media, therefore increasing the brittleness of the particles [32,39] (p. 4, p. 7) With the increasing content of MWCNTs, the effect is maximized, leading to lower average particle sizes [29] (p. 3). Figure 6 shows the particle size distribution obtained for both reinforcement percentages after 2 h and 4 h of HEBM.…”

Section: High-energy Ball Milling (Hebm) Routementioning

confidence: 99%

Effect of Carbon Nanotube Content and Mechanical Milling Conditions on the Manufacture of AA7075/MWCNT Composites

Feijoó

Peña

Cristóbal

et al. 2022

Metals

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Aluminium matrix composites (AlMCs) of AA7075 aluminium alloy reinforced with 0.5 and 1 wt.% multiwall carbon nanotubes (MWCNTs) were fabricated with powder metallurgy techniques using three different mechanical milling strategies, varying the milling energy and the stage in which the reinforcements were added to the pre-alloyed matrix powders. In this paper, we focus on the influence of these parameters on the dispersion of MWCNTs. Characterization of the obtained composite powders by X-ray diffraction and scanning electron microscopy showed that the evolution of the particle size and morphology of the composite powders is influenced by milling conditions and MWCNT content; however, under the conditions tested in this study, there were no significant differences in crystallite size and lattice strain. The best distribution of the reinforcements was obtained after milling 7075 powders and MWCNTs in a high-energy cycle (HEBM), varying the rotation speed between 1200 and 1300 rpm. Raman spectroscopy was used to assess the damage induced by the milling process in the nanotubes, and no reaction products were detected under any of the tested conditions. Nanoindentation tests were performed to measure the elastic modulus and hardness of the composite powders, revealing that the best mechanical behaviour was achieved by the 7075-0.5 wt.% MWCNT composites obtained by the HEBM route.

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The functionalization and characterization of multi-walled carbon nanotubes (MWCNTs)

Cited by 13 publications

References 14 publications

Synergistic Effects of Carbon Nanotubes on Negative Dielectric Properties of Graphene-Phenolic Resin Composites

Synergistic Effects of Carbon Nanotubes on Negative Dielectric Properties of Graphene-Phenolic Resin Composites

Electrical nanocomposites of PA6/ABS/ABS‐MA reinforced with carbon nanotubes (MWCNTf) for antistatic packaging

Effect of Carbon Nanotube Content and Mechanical Milling Conditions on the Manufacture of AA7075/MWCNT Composites

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