Microwave absorbing properties of MWCNT/carbon black-PU nano-composites

Tripathi, K. C.; Abbas, S. M.; Sharma, Rishi; Alegaonkar, P.S.

doi:10.1109/icpcsi.2017.8392344

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…This nanocomposite was studied at S-, C-and X-band frequencies. For the nanocomposite sample with 35wt% NiZn ferrite, 15 wt% multi-wall carbon nanotubes (MWCNT), and 50wt% TPU, the minimum reflection loss was − 12 dB, at the matching frequency of 7.9 GHz at 2.0 mm thickness, with effective absorption bandwidth (≥ − 10 dB) equal to 1.5 GHz [20]. Abbas The samples have shown about 40% absorption, 20% transmission, and 40% reflectance in X and Ku frequency bands.…”

Section: Introductionmentioning

confidence: 95%

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

2020

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In this work, spinel nanoMnNiZn ferrite (Mn 0.1 Ni 0.45 Zn 0.45 Fe 2 O 4) was hosted by a thermoset polyurethane matrix (PU), to produce flexible thin nanocomposite sheets as efficient microwave absorbers. The microwave absorbers of polyurethane nanocomposites were prepared using different loading ratios of MnNiZn ferrite (70%, 75%, and 80wt%). Microwave absorption properties of the nanocomposites were characterized in the range of Sand C-band (2-8 GHz) frequency. Structural and morphological characterizations were performed using X-ray diffractometry (XRD), Fourier-transform infrared spectrophotometer (FTIR), and scanning electron microscopy (SEM). The tensile test was performed to examine the mechanical properties of the molded nanocomposites. The surface hardness was measured using Shore (A) hardness tool. The nanocomposite with 80 wt% loading percent of ferrite in PU at thickness of 5 mm exhibits the best absorption properties and has effective absorption bandwidth (≥ − 10 dB) of 4.28 GHz, with − 29.7 dB minimum reflection loss (RL) at the matching frequency (5.86 GHz) with density of only 2.403 g/cm 3. The experimental results reveal that the microwave absorption properties of the synthesized nanocomposites were improved and reinforced in the case of polyurethane matrix compared to the paraffin wax matrix, through polar-polar interactions and adhesion between the filler and elastomeric matrix depending on their chemical nature. Also, the effect of thermal aging on the performance of the microwave absorption properties of PU-ferrite nanocomposite has been studied. To the best of our knowledge, the use of this cost-effective thermoset polyurethane matrix prepared from PPG, TDI, and castor oil and loaded with ferrite has not been reported before. The effect of polar-polar interactions between the matrix and the ferrite on the microwave absorption characteristics has also been investigated. The high value of reflection loss makes the obtained lightweight and flexible nanocomposite a promising microwave-absorbing material.

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Section: Introductionmentioning

confidence: 95%

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

2020

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“…The skin depth should be small enough to make the coating as thin as possible. 15 Also, the characteristic impedance should match with the free space to allow the EM wave enter into the coating.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Ceramic Composite System for Simultaneous Thermal Protection and Electromagnetic Interference Shielding for Carbon Fiber-Reinforced Polymer Composites

Jia

Ajayi

Wahls

et al. 2020

ACS Appl. Mater. Interfaces

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Achieving a high electrical conductivity while maintaining a good thermal insulation is often contradictory in the material design for the goal of simultaneous thermal protection and electromagnetic interference shielding. The reason is that materials with a high electrical conductivity often pertain a high thermal conductivity. To address this challenge, this study reports a multifunctional ceramic composite system for carbon fiberreinforced polymer composites. The fabricated multifunctional ceramic composite system has a multilayer structure. The polymerderived SiCN ceramic reinforced with yttria-stabilized zirconia fibers serves as the thermal protection and impedance-matching layer, while the yttria-stabilized zirconia fiber-reinforced SiCN ceramic with carbon nanotubes provides the electromagnetic interference shielding. The thermal conductance of the multilayered ceramic composite is about 22.5% lower compared to that of the carbon fiber-reinforced polymer composites. The thermal insulation test during the steady-state condition shows that the hybrid composite can be used up to 300 °C while keeping the temperature reaching the surface of carbon fiber-reinforced polymer composites at around 167.8 °C. The flame test was used to characterize the thermal protection capability under transient conditions. The hybrid composite showed temperature differences of 72.9 and 280.7 °C during the low-and high-temperature settings, respectively. The average total shielding efficiency per thickness of the fabricated four-layered ceramic composite system was 21.45 dB/mm, which showed a high reflection-dominant electromagnetic interference shielding. The average total shielding efficiency per thickness of the eight-layered composite system was 16.57 dB/mm, revealing a high absorption-dominant electromagnetic interference shielding. Typical carbon fiber-reinforced polymer composites reveal a reflection-dominant electromagnetic interference shielding. The electrons can freely move in the percolated carbon nanotubes within the inner layers of the composite material, which provide the improved electromagnetic interference shielding ability. The movement of electrons was impeded by the top and bottom layers whose thermal conduction relies on the lattice vibrations, resulting in a satisfactory thermal insulation of the composite materials and impedance matching with the free space. Results of this study showed that materials with a good thermal insulation and electromagnetic interference shielding can be obtained simultaneously by confining the electron movement inside the materials and refraining their movement at the skin surface.

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“…Therefore, it is desirable to develop new microwave-absorbing materials. An ideal electromagnetic wave-absorbing material should be lightweight and thin and have a simple fabrication process, high environmental adaptability, strong wave absorption, and wide frequency range response . Fortunately, carbon-based composite materials such as carbon black, graphite, graphene, graphene oxide (GO), carbon fibers, and carbon nanotubes are becoming attractive and potential substitutes because of their unique properties, such as being lightweight, structural flexible, and resistant to corrosion and having ease of processing advantages …”

Section: Introductionmentioning

confidence: 99%

“…An ideal electromagnetic wave-absorbing material should be lightweight and thin and have a simple fabrication process, high environmental adaptability, strong wave absorption, and wide frequency range response. 6 Fortunately, carbon-based composite materials such as carbon black, graphite, graphene, graphene oxide (GO), carbon fibers, and carbon nanotubes are becoming attractive and potential substitutes because of their unique properties, such as being lightweight, structural flexible, and resistant to corrosion and having ease of processing advantages. 7 Multiwalled carbon nanotubes (MWCNTs) could be used in sensors 8 and microwave absorbers due to their outstanding structure, conductivity, 9 thermal performance, 10 and mechan-ical properties.…”

Section: Introductionmentioning

confidence: 99%

“…11 In recent times, MWCNTs have been used as microwave absorbers. 12 Tripathi et al 6 prepared a MWCNT/ carbon black-PU nanocomposite, which showed a minimum absorption peak of −16.14 dB (RL min ) at a matching frequency (f m ) of 11.92 GHz and above −10 dB loss (90% absorption of microwave energy) in the frequency range (bandwidth) of 11.03 to 13.00 GHz with a sample thickness of 2.0 mm. Yaghoubi et al 9 prepared Fe 2 O 3 /N-GN/CNTs nanocomposites and found that their maximum reflection loss is 45.8 dB at 9.32 GHz with a thickness of 3 mm, and the effective absorption (below −10 dB) bandwidth reached 14.5 GHz (3.5 to 18.0 GHz).…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Study of Novel Modified [(1-x)MnO₂-xMWCNTs]/Waterborne Polyurethane Composites with Microwave Absorption Properties

Guo

Jiang

2018

Ind. Eng. Chem. Res.

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First, [(1-x)MnO 2 -xMWCNTs] (MMCs) nanocomposites and modified [(1-x)MnO 2 -xMWCNTs] (mMMCs) nanocomposites were synthesized. Then, novel modified [(1-x)MnO 2 -xMWCNTs]/waterborne polyurethane (mMMCs/WPU) composites with good microwave absorption properties were prepared by in situ polymerization. The chemical functionalized MMCs and mMMCs nanocomposites were characterized by FTIR and XRD.The structure and properties of the mMMCs/WPU composites were investigated by SEM, TGA, tensile testing, and vector network analyses. The experimental results showed that when the mMMCs nanocomposites were introduced into WPU the thermal stability and tensile strength of mMMCs/WPU composites were improved. When the content of MWCNTs was 20 wt % (where x = 0.2), m[(1x)MnO 2 -xMWCNTs]/WPU composites exhibited good microwave absorption properties. The minimum RL value can reach −28.7 dB at 6.4 GHz with a thickness of 2.5 mm. The mMMCs/WPU composites have good thermal stability and tensile strength, which could be used as promising materials for microwave absorption.

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Microwave absorbing properties of MWCNT/carbon black-PU nano-composites

Cited by 4 publications

References 10 publications

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

Multifunctional Ceramic Composite System for Simultaneous Thermal Protection and Electromagnetic Interference Shielding for Carbon Fiber-Reinforced Polymer Composites

Preparation and Study of Novel Modified [(1-x)MnO₂-xMWCNTs]/Waterborne Polyurethane Composites with Microwave Absorption Properties

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Microwave absorbing properties of MWCNT/carbon black-PU nano-composites

Cited by 4 publications

References 10 publications

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

Preparation and characterization of a flexible microwave absorber based on MnNiZn ferrite (Mn0.1Ni0.45Zn0.45Fe2O4) in a thermoset polyurethane matrix

Multifunctional Ceramic Composite System for Simultaneous Thermal Protection and Electromagnetic Interference Shielding for Carbon Fiber-Reinforced Polymer Composites

Preparation and Study of Novel Modified [(1-x)MnO2-xMWCNTs]/Waterborne Polyurethane Composites with Microwave Absorption Properties

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Preparation and Study of Novel Modified [(1-x)MnO₂-xMWCNTs]/Waterborne Polyurethane Composites with Microwave Absorption Properties