Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

Silva, Valdirene Aparecida; Folgueras, Luiza de Castro; Cândido, Geraldo Maurício; Paula, Adriano Luiz de; Rezende, Mirabel Cerqueira; Costa, Mirco

doi:10.1590/s1516-14392013005000146

Cited by 33 publications

(20 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bhattacharya et al [ 48 ] prepared a 2 mm thick unmodified MWCNT/polyurethane nanocomposite at a 30 wt% CNT loading through solution blending using mechanical stirring, with the maximum reflection loss of 16.03 dB at 10.99 GHz. MWCNT/epoxy nanocomposites with CNT loadings, matching thicknesses and maximum reflection loss of 0.5 wt%, 9 mm, 25 dB at 11 GHz as well as 5 wt%, 3 mm, 18 dB at 8 GHz, respectively, have also been reported [ 53 , 54 ].…”

Section: Resultsmentioning

confidence: 99%

The impact of different multi-walled carbon nanotubes on the X-band microwave absorption of their epoxy nanocomposites

Che

Nguyen

et al. 2015

Chemistry Central Journal

View full text Add to dashboard Cite

BackgroundCarbon nanotube (CNT) characteristics, besides the processing conditions, can change significantly the microwave absorption behavior of CNT/polymer composites. In this study, we investigated the influence of three commercial multi-walled CNT materials with various diameters and length-to-diameter aspect ratios on the X-band microwave absorption of epoxy nanocomposites with CNT contents from 0.125 to 2 wt%, prepared by two dispersion methods, i.e. in solution with surfactant-aiding and via ball-milling.ResultsThe laser diffraction particle size and TEM analysis showed that both methods produced good dispersions at the microscopic level of CNTs. Both a high aspect ratio resulting in nanotube alignment trend and good infiltration of the matrix in the individual nanotubes, which was indicated by high Brookfield viscosities at low CNT contents of CNT/epoxy dispersions, are important factors to achieve composites with high microwave absorption characteristics. The multi-walled carbon nanotube (MWCNT) with the largest aspect ratio resulted in composites with the best X-band microwave absorption performance, which is considerably better than that of reported pristine CNT/polymer composites with similar or lower thicknesses and CNT loadings below 4 wt%.ConclusionsA high aspect ratio of CNTs resulting in microscopic alignment trend of nanotubes as well as a good level of micro-scale CNT dispersion resulting from good CNT-matrix interactions are crucial to obtain effective microwave absorption performance. This study demonstrated that effective radar absorbing MWCNT/epoxy nanocomposites having small matching thicknesses of 2–3 mm and very low filler contents of 0.25-0.5 wt%, with microwave energy absorption in the X-band region above 90% and maximum absorption peak values above 97%, could be obtained via simple processing methods, which is promising for mass production in industrial applications.Graphical AbstractComparison of the X-band microwave reflection loss of epoxy composites of various commercial multi-walled carbon nanotube materials.

show abstract

Section: Resultsmentioning

confidence: 99%

The impact of different multi-walled carbon nanotubes on the X-band microwave absorption of their epoxy nanocomposites

Che

Nguyen

et al. 2015

Chemistry Central Journal

View full text Add to dashboard Cite

show abstract

“…However, they use different configurations and distinct processing techniques, with variable results in terms of microwave attenuation. For example, Silva et al studied nanocomposites of carbon nanotubes dispersed in epoxy resins and reached maximum attenuation of 25 dB at 11 GHz for a formulation containing 0.5 wt% of CNT, which is about 99.7% absorption, but using a 9‐mm‐thick composite. They also comment on the presence of carbon nanotube clusters that can act as electrical conduction islands and promote attenuation of electromagnetic wave.…”

Section: Resultsmentioning

confidence: 99%

Glass fiber/carbon nanotubes/epoxy three-component composites as radar absorbing materials

et al. 2015

View full text Add to dashboard Cite

The use of micro or nano‐fillers to optimize the properties of epoxy resins has become a common practice. The Carbon nanotubes (CNT) are considered excellent fillers because of their strength, stiffness, thermal conductivity, electrical capacity, and thermal stability, along with large electromagnetic wave absorption capability in the microwave range. In this work, electromagnetic absorption properties and dynamic‐mechanical response obtained with the incorporation of CNT into glass fiber/epoxy composites have been studied. A novel procedure to disperse and deposit CNT onto glass fiber fabrics has been developed to reach high overall content of CNT in the composite (4.15 wt%). Storage modulus increased with the incorporation of CNT, especially when they had also been incorporated into the epoxy, and for higher frequency (3 Hz). The response of the composites to electromagnetic radiation has shown an increasing trend for higher CNT content (up to 2 wt%), reaching an excellent attenuation value of up to −18.3 dB (98.5% of absorption). POLYM. COMPOS., 37:2277–2284, 2016. © 2015 Society of Plastics Engineers

show abstract

“…CNT exhibit high mechanical resistance, which may vary from 10-100 GPa with module up to 1 TPa, reduced density (10-1315 g.m -3 ) according to the number of walls of and excellent electrical (10 4 -10 6 S.cm -1 ) and thermal properties (3000-6000 mK.W -1 ). CNT cylinders may have open or closed ends 6,7,8,9,10 . Studies have shown that CNT can perform well in the microwave attenuation when incorporated in polymeric matrices and in multilayer structures 9,10,11 .…”

Section: Introductionmentioning

confidence: 99%

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

Silva

Rezende

2018

Mat. Res.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

Cited by 33 publications

References 61 publications

The impact of different multi-walled carbon nanotubes on the X-band microwave absorption of their epoxy nanocomposites

The impact of different multi-walled carbon nanotubes on the X-band microwave absorption of their epoxy nanocomposites

Glass fiber/carbon nanotubes/epoxy three-component composites as radar absorbing materials

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

Contact Info

Product

Resources

About