Magnetic property measurements on single wall carbon nanotube polyimide composites

Sun, K.J.; Wincheski, Russell A.; Park, Cheol

doi:10.1063/1.2832616

Cited by 17 publications

(9 citation statements)

References 20 publications

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“…The reason for this phenomenon could be predicted from promoting interfacial coupling between the carbon nanotube filler and polymer matrix which causes diamagnetic response from carbon nanotube and diminishes the total magnetization of the absorber. 38 According to eq. (4), considering fixed thicknesses in both nanofiber and film absorber, and this change in relative complex permittivity and permeability, remaining maximum RL peak almost unmoved is not surprising.…”

Section: Resultsmentioning

confidence: 99%

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

et al. 2015

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Electrospinning of conductive polymer blends offers high potential to prepare novel materials for electronical applications. The main aim of this work is to fabricate poly(vinyl alcohol) (PVA), polyaniline (PANI), and multi walled carbon nanotubes (MWNT) composites in thin film and nanofiber layer structures and then compare their microwave absorption behavior. First, optimum ratios for blending PVA, PANI, Camphorsulfonic acid (CSA) and MWNT were obtained. Then under optimized ratios, composite solutions of PVA: PANI-CSA, and PVA/PANI-CSA/ MWNT were fabricated to nanofiber layer and thin film structures. Based on scanning electron microscope (SEM) micrographs, the PVA/PANI-CSA nanofiber samples at low content of PANI-CSA presented a very uniform surface and without any beads but some beads started to develop at higher PANI-CSA content. However, the SEM analysis of the PVA/PANI-CSA/MWNT films revealed the uniform appearance for all composites. But, some aggregation and local irregularities on the surface were observed due to the presence of MWNT in the composite structure. Microwave absorption behavior was evaluated using vector network analyzers in the frequency range of 8-12 GHz (X-band) for all samples. It was observed that absorption microwave properties of PVA/PANI-CSA nanofibers improved with increasing in the loading levels of PANI-CSA in the mixture. Microwave absorption properties of the PVA/PANI-CSA/MWNT composite nanofiber absorbers have been compared with thin films at various thicknesses by measuring the relative maximum reflection loss (dB/mm) of samples. The PVA/PANI-CSA/MWNT composite nanofibers with the layer thickness of 0.1 mm presented two remarkable absorbing peaks versus one absorbing peak in nanocomposite films with similar thickness. The relative maximum reflection loss in PVA/PANI-CSA/MWNT composite nanofiber has reached -230 dB/mm at frequency of 8.6 GHz which is nearly 8 times higher than -28 dB/ mm at frequency of 8.4 GHz for PVA/PANI-CSA/MWNT film samples.

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Section: Resultsmentioning

confidence: 99%

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

et al. 2015

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“…The magnetic properties of carbon nanotubes (CNTs) are reported [83][84][85] due to their sensitivity to the applied magnetic eld especially if the magnetic eld direction is parallel to the tube principle axis, therefore CNTs may show some response to the applied magnetic eld (paramagnetic or diamagnetic) depending on some parameters i.e. tube's diameter, chirality, Fermi energy level, and the magnetic eld direction relative to tube principle axis.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Supramolecular structures of terbium(iii) porphyrin double-decker complexes on a single-walled carbon nanotube surface

El‐Mageed

Ogawa

2019

RSC Adv.

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“…Moreover, the nanocomposites containing 10 wt% of MWCNTs resulted in the dielectric constant reaching 60, which are about 17 times of 3.5 for pure polyimide (Thuau et al 2009). The electrical resistivity of the nanocomposites surface was reduced from 1.28 × 1015 ohm cm −2 for neat polyimide, to 7.5 × 106 ohm cm −2 by the addition of 6.98 wt% of MWCNTs (Myung et al 2010;Sun et al 2008). The frequency behavior of specific admittance of 0.05 vol% of CNTs-filled polyimides composites determined that its conductivity properties follow a percolation-like power law, with a comparatively low percolation threshold (Tzeng et al 2008;Guo et al 2009;Zha et al 2013).…”

Section: Cnts: In Polyimides Polymeric Compositesmentioning

confidence: 99%

Multifunctionalized Carbon Nanotubes Polymer Composites: Properties and Applications

Julkapli

Sapuan

2015

Advanced Structured Materials

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Carbon nanotubes (CNTs) is a rigid rod-like nanoscale material produced from carbon in powder, liquid, or gel form via acid or chemical hydrolysis. Due to its unique and exceptional renewability, biodegradability, mechanical, physicochemical properties, and abundance, the incorporation associated with a small quantity of CNTs to polymeric matrices enhance the mechanical and thermal resistance, and also stability of the latter by several orders of magnitude. Moreover, NCC-derived carbon materials are of no serious threat to the environment, providing further impetus for the development and applications of this green and renewable biomaterial for lightweight and degradable composites. Surface functionalization of CNTs remains the focus of CNTs research in tailoring its properties for dispersion in hydrophilic and hydrophobic media. Through functionalization, the attachment of appropriate chemical functionalities between conjugated sp 2 of CNTs and polymeric matrix is established. It is thus of utmost importance that the tools and protocols for imaging CNTs in a complex matrix and quantify its reinforcement, antimicrobial, stability, hydrophilicity, and biodegradability are be developed.

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Magnetic property measurements on single wall carbon nanotube polyimide composites

Cited by 17 publications

References 20 publications

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

Supramolecular structures of terbium(iii) porphyrin double-decker complexes on a single-walled carbon nanotube surface

Multifunctionalized Carbon Nanotubes Polymer Composites: Properties and Applications

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