Electromagnetic absorption properties of natural microcrystalline graphite

Xie, Wei; Zhu, Xukun; Yi, Shihe; Kuang, Jiacai; Cheng, Haifeng; Wei, Tang; Deng, Yingjun

doi:10.1016/j.matdes.2015.10.115

Cited by 66 publications

(24 citation statements)

References 34 publications

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“…The results have shown an EMI reflective peak of 20.46 dB at 3.02 GHz. Overall results from this experiment have shown that MCG has the potential to be used as an effective filler in EMI shielding composites with further improvements [82]. To create a composite with a lower content of filler material the use of Ketjen carbon black (K-CB), which is a superior form of conductive carbon black, has been added to chlorinated polyethene (CPE) and tested for its EMI SE in the frequency range of 8.2 to 12.4 GHz.…”

Section: Carbon Black-based Polymer Compositesmentioning

confidence: 86%

Review of Polymer Composites with Diverse Nanofillers for Electromagnetic Interference Shielding

et al. 2020

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Polymer matrix composites have generated a great deal of attention in recent decades in various fields due to numerous advantages polymer offer. The advancement of technology has led to stringent requirements in shielding materials as more and more electronic devices are known to cause electromagnetic interference (EMI) in other devices. The drive to fabricate alternative materials is generated by the shortcomings of the existing metallic panels. While polymers are more economical, easy to fabricate, and corrosion resistant, they are known to be inherent electrical insulators. Since high electrical conductivity is a sought after property of EMI shielding materials, polymers with fillers to increase their electrical conductivity are commonly investigated for EMI shielding. Recently, composites with nanofillers also have attracted attention due to the superior properties they provide compared to their micro counterparts. In this review polymer composites with various types of fillers have been analysed to assess the EMI shielding properties generated by each. Apart from the properties, the manufacturing processes and morphological properties of composites have been analysed in this review to find the best polymer matrix composites for EMI shielding.

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Section: Carbon Black-based Polymer Compositesmentioning

confidence: 86%

Review of Polymer Composites with Diverse Nanofillers for Electromagnetic Interference Shielding

et al. 2020

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“…51 Generally, the measured dielectric parameters at the desired frequency are used to determine the RL of incident EM wave in materials. 4,17,20,49 Fig. 7 shows the calculated RL of prepared CAs composites in the range of 8.2-12.4 GHz as a function of PSD.…”

Section: Ftir Analysismentioning

confidence: 99%

Electromagnetic and microwave absorption characteristics of PMMA composites filled with a nanoporous resorcinol formaldehyde based carbon aerogel

2018

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Nanostructured carbons have opened up new perspectives in fields of electromagnetic (EM) applications.The present study aims at the processing of microwave absorbing (MA) materials based on carbon aerogels (CAs) in polymethyl methacrylate (PMMA) matrix to be used in X-band frequency. CAs were synthesized by carbonization of a sol-gel derived organic gel from resorcinol and formaldehyde as starting materials. Microwave attenuation properties of the prepared composites were investigated in terms of CAs particle size distribution (PSD) and mass fraction. To do so, the optimal PSD was initially determined by assessing the EM attenuation performance of the CAs/PMMA composites with constant mass loading (10 wt%) and differing particle sizes. Next, the EM properties of the selected CAs with the optimal particle size was measured as a function of mass fraction varying from 1 to 15 wt% in order to obtain a highly efficient CAs based MA. The results indicate that the dielectric loss of CAs composites can be enhanced by optimizing the PSD as well as the mass fraction of CAs. The effective absorption bandwidth of composites containing 10 wt% of CAs exceeded 3.7 GHz at a very thin thickness of 1.9 mm indicating that these materials present advantages as microwave absorbers.

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“…Along with the substantial development in radio frequency sources and rapid progress in electronic and communication devices, issues involving electromagnetic interference (EMI) continue to increase; thus, material characterization of microwave absorbers have been gaining widespread interest . Microwave absorbers eliminate unwanted radiations that can interfere with the operation of electronic devices and reduce signal reflections externally.…”

Section: Introductionmentioning

confidence: 99%

Effect of untreated fiber loading on the thermal, mechanical, dielectric, and microwave absorption properties of polycaprolactone reinforced with oil palm empty fruit bunch biocomposites

et al. 2018

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Basic research on recyclable, renewable and biodegradable polymer composite materials reinforced with natural fibers is increasingly growing. In this article, we characterize agricultural waste by determining its dielectric properties for microwave absorber application. Recently, polymer composites reinforced with natural fibers are increasingly used in dielectric and aircraft applications. We used a Thermal Hake blending machine to blend oil palm empty fruit bunch with polycaprolactone grain to make a homogeneous powder. The functional groups of the resulting composites were then analyzed through Fourier transform infrared spectrometry. Thermogravimetric and differential thermogravimetric analyses were performed to determine the thermal degradation behaviors of the composites. The tensile strength, tensile modulus and elongation at break of the composites were measured in an Instron universal testing machine. A rectangular waveguide and open‐ended coaxial probe connected to a microwave network analyzer (PNA) Agilent N5230A PNA‐L was used to measure the reflection coefficient S11 and transmission coefficient S21 values and the dielectric properties of the composite materials. Results showed that the thermal stability and dielectric properties of the polymer composites decreased as the fiber content increased. The composites exhibited potential as microwave absorbers at microwave frequencies. POLYM. COMPOS., 39:E1778–E1787, 2018. © 2018 Society of Plastics Engineers

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Electromagnetic absorption properties of natural microcrystalline graphite

Cited by 66 publications

References 34 publications

Review of Polymer Composites with Diverse Nanofillers for Electromagnetic Interference Shielding

Review of Polymer Composites with Diverse Nanofillers for Electromagnetic Interference Shielding

Electromagnetic and microwave absorption characteristics of PMMA composites filled with a nanoporous resorcinol formaldehyde based carbon aerogel

Effect of untreated fiber loading on the thermal, mechanical, dielectric, and microwave absorption properties of polycaprolactone reinforced with oil palm empty fruit bunch biocomposites

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