Microwave Absorption Characteristics of Carbon Nanotubes

Sun, Xiaoning; Gao, Ming; Li, Cheng; Wu, Yiqiang

doi:10.5772/16514

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…This increase is attributed to the interaction of smaller molar mass fractions of epoxy resin with CNT, resulting in the intercalation of small molecules between the layers of CNT structure. The literature mentions similar behavior for CNT in polymeric composites 28,29,30 . The proposed CNT/epoxy resin interaction can be considered interesting when a good interface between the two components is desired, although this behavior contributes to increase the interlayer distance.…”

Section: Structural Characterizationmentioning

confidence: 80%

Effect of the Morphology and Structure on the Microwave Absorbing Properties of Multiwalled Carbon Nanotube Filled Epoxy Resin Nanocomposites

Silva

Rezende

2018

Mat. Res.

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The current research shows the effect of structural and morphological differences of multilayer carbon nanotubes (CNT) on radar absorbing materials (RAM) performance. Two CNT samples, from different manufacturers, had their morphological and structural aspects investigated by XRD, SEM and SEM-FEG analyses. CNT/epoxy resin based nanostructured composites were prepared and characterized by reflectivity measurements in the X-band. SEM results show the formation of agglomerates in the composites and the XRD patterns show structural differences between the two CNT samples. The best RAM performance (-25 dB) was determined for the nanocomposite based on the CNT with the smallest stacking layers (Lc = 26.9 Å) associated to the longest length of nanofilament (10-20 µm). This characteristic can have contributed to the formation of an interconnected network in the composite favoring electrical conductivity and dielectric properties, with the consequent increase of the wave attenuation.

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Section: Structural Characterizationmentioning

confidence: 80%

Effect of the Morphology and Structure on the Microwave Absorbing Properties of Multiwalled Carbon Nanotube Filled Epoxy Resin Nanocomposites

Silva

Rezende

2018

Mat. Res.

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“…These unique characteristics enhance largely the microwave absorption performance of barium hexaferrite-reinforced composites. 36 Figure 14 depicts SEM micrographs of the selfhealed multifunctional coatings after scratch testing. In these experiments, chitosan content varied in the range of 0.01-0.2% in the multifunctional coatings.…”

Section: Results and Discussion Additivesmentioning

confidence: 99%

Multifunctional polymer composites: Antibacterial, flame retardant, radar absorbing and self-healing

Atay

Çelik

2014

Journal of Composite Materials

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Multifunctional materials are able to respond to environmental stimuli by exhibiting particular changes in some of their properties. Desired properties can be combined to create a new item with composite materials due to their suitability for achieving multi-functionality with the best characteristics of different materials. In this study, the aim is to further the investigations of these types of materials and to advance the molecular understanding of novel multifunctional materials for applications across different scientific disciplines. Regarding the production of multifunctional materials, four types of materials were added to the polymer matrix to obtain the following properties: antibacterial, radar absorbing, self-healing, and flame retardant. In this research, an epoxy dye was converted to a multifunctional material which is capable of performing multiple functions. In order to reinforce an epoxy dye, Ag nanoparticles, huntite/hydromagnesite minerals, barium hexaferrite particles, and chitosan were utilized for multifunction property. By adding those materials to the polymer matrix with different loading level, different types of coated samples were obtained. Subsequently, the samples were characterized by antibacterial tests, flame-retardant tests, radar absorbing tests, and self-healing tests besides other characterization tests; FTIR, SEM, XRD, scratch, surface profilometer, etc. It was concluded that these materials exhibited a synergetic beneficial effects.

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“…The probable reason was that at this smaller MWCNT concentration, the formation of the insulating polymer layer between the MWCNTs decreased the tunneling conductivity, and this resulted in in a smaller e 00 . 20 The case for e 0 was similar; this was higher in HC-GCNTs because of the combined effects of the MWCNTs and micrometer-sized graphite.…”

Section: Hc-cnt Seriesmentioning

confidence: 89%

Effect of low‐content carbon nanotubes on the dielectric and microwave absorption properties of graphite/polymer nanocomposites

Khurram

Rakha

Ali

et al. 2014

J of Applied Polymer Sci

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Honeycomb cores (HCs) coated with graphite and multiwalled carbon nanotubes (MWCNTs) filled in a thermoplastic resin are proposed as microwave absorbers. The MWCNT contents varied from 0.2 to 0.6 wt % in a graphite‐filled (15 wt %) thermoplastic resin. The HCs were coated with three different types of coating materials for the sake of comparison: graphite, MWCNTs, and graphite plus MWCNTs. The dielectric properties [the real and imaginary parts of complex permittivity (ε′ and ε″, respectively)] and reflection loss (RL) of all of the coated HCs were measured and compared. We observed that the permittivities and RL increased significantly with increased weight percentage of the MWCNTs in the graphite‐filled thermoplastic resin. The RL measurements showed a maximum loss of −20 dB around 7 GHz and a bandwidth of 2.7 GHz at −10 dB in the HCs coated with the 0.4 wt % MWCNT plus graphite. There was also a shift in the RL peak position from the x band to the c band after the increase of MWCNT content. We also observed from the measurements that a combination of graphite and MWCNTs resulted in a broadband microwave absorber; a bandwidth of 13 GHz was observed for 80% RL when the MWCNT content increased to 0.6 wt % in the graphite‐incorporated resin. The possible mechanism that increased RL with the incorporation of MWCNTs in the graphite‐mixed thermoplastic resin is discussed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40891.

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Microwave Absorption Characteristics of Carbon Nanotubes

Cited by 12 publications

References 16 publications

Effect of the Morphology and Structure on the Microwave Absorbing Properties of Multiwalled Carbon Nanotube Filled Epoxy Resin Nanocomposites

Effect of the Morphology and Structure on the Microwave Absorbing Properties of Multiwalled Carbon Nanotube Filled Epoxy Resin Nanocomposites

Multifunctional polymer composites: Antibacterial, flame retardant, radar absorbing and self-healing

Effect of low‐content carbon nanotubes on the dielectric and microwave absorption properties of graphite/polymer nanocomposites

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