Abstract:Using carbon-fibre-reinforced polymer (CFRP) composites for electromagnetic interference (EMI) shielding has become a rapidly emerging field. This state-of-the-art review summarises all the recent research advancements in the field of electromagnetic shielding properties of CFRP composites, with exclusive attention paid to experimental work. It focuses on (1) important mechanisms and physical phenomena in the shielding process for anisotropic carbon-fibre composites and (2) shielding performance of CFRP materi… Show more
“…When SE T > 10 dB or the thickness of shielding materials is larger than that of the skin depth, SE M can be neglected and thus SE T is reduced to the Equation () 38–41 :…”
Composites with high thermal conductivity and excellent electromagnetic interference (EMI) shielding performance are very important for the long-term stable operation of electronic equipment. In this work, we report a simple and effective method to construct thermally and electrically conductive network pathways by hybridizing pitch-based carbon fiber (PCF) and spherical boron nitride (s-BN), in which PCF plays the role in building the framework, and s-BN acts as a bridge to connect the PCF framework. This can simultaneously
“…When SE T > 10 dB or the thickness of shielding materials is larger than that of the skin depth, SE M can be neglected and thus SE T is reduced to the Equation () 38–41 :…”
Composites with high thermal conductivity and excellent electromagnetic interference (EMI) shielding performance are very important for the long-term stable operation of electronic equipment. In this work, we report a simple and effective method to construct thermally and electrically conductive network pathways by hybridizing pitch-based carbon fiber (PCF) and spherical boron nitride (s-BN), in which PCF plays the role in building the framework, and s-BN acts as a bridge to connect the PCF framework. This can simultaneously
“…This pollution affects the performance of these devices and also has a very negative impact on human health 5,6 . Therefore, there is a need for a suitable material that can act as a shield to counter electromagnetic waves 7 . Electromagnetic shielding requires a balanced combination between electrical conductivity, dielectric permittivity, and magnetic permittivity.…”
Section: Introductionmentioning
confidence: 99%
“…5,6 Therefore, there is a need for a suitable material that can act as a shield to counter electromagnetic waves. 7 Electromagnetic shielding requires a balanced combination between electrical conductivity, dielectric permittivity, and magnetic permittivity. In a material, the main mechanism for EMI attenuation are absorption, reflection, and multiple reflections.…”
Section: Introductionmentioning
confidence: 99%
“…In a material, the main mechanism for EMI attenuation are absorption, reflection, and multiple reflections. [7][8][9][10] The phenomenon of reflection depends on the mobile charge carriers such as electrons which are present in the material along with them. Therefore, the shielding material is likely to be electrically conductive.…”
In this study, we investigated the mechanical, DC conductivity, and electromagnetic interference (EMI) shielding properties of multiwalled carbon nanotubes (MWCNTs) and carbon fiber reinforced polypropylene (CNC) nanocomposites. The nanocomposites were prepared by melt processing technique using a twin‐screw extruder followed by injection molding. This combination of CF and MWCNT improved the tensile strength and modulus of the nanocomposites by up to 31.14% and 60.14%. The percolation behavior helped to improve the DC electrical conductivity from 2.07 × 10−10 to 9.58 × 10−2 s/cm. The CNC nanocomposites exhibited shielding effectiveness of 51.9 dB at maximum filler loading in the X‐band (8.2–12.4 GHz) for a 2 mm thick sample. In addition, efforts have been made to develop a compatible EMI shielding material using multiple fillers.
“…The electrical conductivity and EMI shielding ability of such composites mostly depend on the type (metal-based or carbon-based) and physical parameters (size, concentration, structure, processing, and dispersion) of the conductive fillers used. The extent of SE improvement with the gradient increases, creating longer fibers [ 7 , 8 ].…”
Conventional conductive homopolymers such as polypyrrole and poly-3,4-ethylenedioxythiophene (PEDOT) have poor mechanical properties, for the solution to this problem, we tried to construct hybrid composites with higher electrical properties coupled with high mechanical strength. For this purpose, Kevlar fibrous waste, conductive carbon particles, and epoxy were used to make the conductive composites. Kevlar waste was used to accomplish the need for economics and to enhance the mechanical properties. At first, Kevlar fibrous waste was converted into a nonwoven web and subjected to different pretreatments (chemical, plasma) to enhance the bonding between fiber-matrix interfaces. Similarly, conductive carbon particles were converted into nanofillers by the action of ball milling to make them homogeneous in size and structure. The size and morphological structures of ball-milled particles were analyzed by Malvern zetasizer and scanning electron microscopy. In the second phase of the study, the conductive paste was made by adding the different concentrations of ball-milled carbon particles into green epoxy. Subsequently, composite samples were fabricated via a combination of prepared conductive pastes and a pretreated Kevlar fibers web. The influence of different concentrations of carbon particles into green epoxy resin for electrical conductivity was studied. Additionally, the electrical conductivity and electromagnetic shielding ability of conductive composites were analyzed. The waveguide method at high frequency (i.e., at 2.45 GHz) was used to investigate the EMI shielding. Furthermore, the joule heating response was studied by measuring the change in temperature at the surface of the conductive composite samples, while applying a different range of voltages. The maximum temperature of 55 °C was observed when the applied voltage was 10 V. Moreover, to estimate the durability and activity in service the ageing performance (mechanical strength and moisture regain) of developed composite samples were also analyzed.
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