Electrical Properties and Applications of Carbon Nanotube Structures

Bandaru, Prabhakar R.

doi:10.1166/jnn.2007.307

Cited by 515 publications

(302 citation statements)

References 151 publications

(218 reference statements)

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“…The largest value of σ was observed for the sample with MWCNT wt% loading of 25% with a value of 2.0320 S/m. The good conducting nature of MWCNT results in the improvement the overall electrical conductivity of the composite material [20].…”

Section: Electrical Propertymentioning

confidence: 99%

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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Abstract-An electromagnetic interference (EMI) shielding material based on the composite of BaFe 12 O 19 , polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) was proposed. The constituents of the composite were brought together through mechanical mixing and the in-situ polymerization of aniline on the BaFe 12 O 19 and MWCNT surfaces. A series of composite with different MWCNT wt% loadings (0, 5, 10, 15, 20 and 25wt%) was prepared, and its effect on the EMI shielding performance was investigated. X-ray diffraction analysis was performed on all synthesized composites to confirm the phase formations. FESEM micrographs reveal the PANI particle formation on both BaFe 12 O 19 and MWCNT surfaces. Electromagnetic measurements were done by using a rectangular waveguide connected to a network analyser to obtain the permeability, μ r , permittivity, ε r , and shielding effectiveness (SE A and SE R ). The increase in the MWCNT loading results in the enhancement of the composite's shielding performance to a certain limit. Optimum EMI shielding performance is shown by sample PBM4 (20wt% MWCNT) with SE R and SE A values of 5.14 dB at 8.2 GHz and 36.41 dB at 12.4 GHz, respectively. The influence of different MWCNT loadings (0, 5, 10, 15, 20 and 25wt%) on the EMI shielding performance of a composite consisting of BaFe 12 O 19 , polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) were investigated.

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Section: Electrical Propertymentioning

confidence: 99%

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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“…Single-wall carbon nanotubes [1] (SWCNT) are known to possess outstanding physical and chemical properties such as high electrical and thermal conductivities, photo luminescence, and mechanical properties [2][3][4][5]. However, pure SWCNT form firm bundles [6], which hampers their application to various technologies.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Kukobat

Minami

Hayashi

et al. 2015

Carbon

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We report a bimetallic Zn/Al complex as an efficient inorganic dispersant for SWCNT, synthesized from Zn(CH3COO)2 and Al(NO3)3. The Zn/Al complex shows more than four times greater efficiency at dispersing SWCNT than widely used surfactants (CTAB and SDS). Besides remarkable dispersibility, the Zn/Al complex does not foam upon any shaking treatment and it can be used just after quick dissolution of the powdered form, which is a marked advantage over surfactants. The Zn/Al complex, containing amorphous Al(CH3COO)3 and a complex of Zn 2+and NO 3 − ions, should have a unique dispersion mechanism, differing from the surfactants.Al(CH3COO)3 has higher affinity for SWCNT than ions, adsorbing onto their surface in the first layer and attracting Zn 2+ and NO 3 − ions. Charge transfer interactions between the Zn/Al complex and SWCNT as evidenced by optical absorption spectroscopy should induce a charge on SWCNT; the zeta potential of such coated SWCNT was +55 mV, which is in agreement with the high stability of SWCNT in water. Hence, the Zn/Al complex can widen the applications of SWCNT to various technologies such as the transparent and conductive films, as well as high performance composite polymers.

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“…Carbon nanotubes (CNTs) have received much attention because of their interesting properties, including their exceptional mechanical 10 and high electrical and thermal conductivity, 11 which facilitate their use as reinforcements or additives in materials such as plastics, metals, and ceramics to improve the properties of the materials and introduce novel functionalities. 12,13 In the medical field, biomaterials using CNTs are expected to be useful as local drug-delivery systems or scaffolds for promoting and guiding bone-tissue regeneration.…”

mentioning

confidence: 99%

Enhancement of the Effects of Exfoliated Carbon Nanofibers by Bone Morphogenetic Protein in a Rat Femoral Fracture Model

Miyazaki

Toyoda

Yoshiiwa

et al. 2014

Journal Orthopaedic Research

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Exfoliated carbon nanofibers (ExCNFs) are expected to serve as excellent scaffolds for promoting and guiding bone-tissue regeneration. We aimed to enhance the effects of ExCNFs with bone morphogenetic proteins (BMPs) and examine their feasibility and safety in clinical applications using a rat femoral fracture model. Group I (n ¼ 16) animals were implanted with control MedGEL. Group II (n ¼ 17) animals were implanted with MedGEL containing ExCNFs. Group III (n ¼ 15) animals were implanted with MedGEL containing 1 mg rhBMP-2. Group IV (n ¼ 15) animals were implanted with MedGEL containing 1 mg rhBMP-2 and ExCNFs. The rats were euthanized after 6 weeks, and their fractured femurs were explanted and assessed by manual palpation, radiographs, and highresolution microcomputerized tomography (micro-CT); the femurs were also subjected to biomechanical and histological analysis. The fusion rates in Group IV (73.3%) were considerably higher than those in Groups I (25. Keywords: exfoliated carbon nanofiber; bone morphogenetic protein; fracture healing; rat femoral fracture model; scaffold Bone morphogenetic proteins (BMPs) are members of the transforming growth factor b superfamily and are powerful osteoinductive molecules. The osteoinductive effects of recombinant human BMPs (rhBMPs) in surgical procedures such as fracture repair, healing of critical-size bone defects, and spinal fusion have been demonstrated in animal models and clinical trials; furthermore, rhBMP-2 and rhBMP-7 have been approved for clinical use. [1][2][3][4][5] Unfortunately, the results of clinical trials show that high doses of BMPs are required to induce adequate bone fusion, as the molecules are soluble and easily diffuse away from the fusion site, becoming inactivated in vivo. 6 In addition, the usefulness of BMPs is limited by their high costs. To address these problems, a number of strategies are being developed to generate safer, less expensive, and more efficacious spinal fusion using rhBMP. However, the efficient immobilization of BMPs onto carriers at low dosage while maintaining desirable in vivo regenerative action remains as a major challenge in bone regeneration research and practice. 7,8 The required rhBMP-2 level in humans, even for the FDA-approved collagen sponge-incorporated treatment, is much higher (over six orders of magnitude greater) than that used for in vitro cell level evaluation and in vivo animal studies. 7,9 Several ongoing investigations aim to develop a scaffold that functions as a delivery vehicle, providing cells with a more controlled and sustained release of bioactive molecules to maintain the local growth factor concentration within the therapeutic range.Carbon nanotubes (CNTs) have received much attention because of their interesting properties, including their exceptional mechanical 10 and high electrical and thermal conductivity, 11 which facilitate their use as reinforcements or additives in materials such as plastics, metals, and ceramics to improve the properties of the materials and introduce nove...

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Electrical Properties and Applications of Carbon Nanotube Structures

Cited by 515 publications

References 151 publications

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Enhancement of the Effects of Exfoliated Carbon Nanofibers by Bone Morphogenetic Protein in a Rat Femoral Fracture Model

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