Electromagnetic Shielding Coatings Research Articles

Advancements in electromagnetic shielding coatings for aerospace applications: a comprehensive review

Advancements in electromagnetic shielding coatings for aerospace applications: a comprehensive review

Scalable Production of Catecholamine-Densified MXene Coatings for Electromagnetic Shielding and Infrared Stealth.

Processing transition metal carbides/nitrides (MXenes) inks into large-area functional coatings expects promising potential for electromagnetic interference (EMI) shielding and infrared stealth. However, the coating performances, especially for scalable fabrication techniques, are greatly constrained by the flake size and stacking manner of MXene. Herein, the large-area production of highly densified and oriented MXene coatings is demonstrated by engineering interfacial interactions of small MXene flakes with catecholamine molecules. The catecholamine molecules can micro-crosslink MXene nanosheets, significantly improving the ink's rheological properties. It favors the shear-induced sheet arrangement and inhibition of structural defects in the blade coating process, making it possible to achieve high orientation and densification of MXene assembly by either large-area coating or patterned printing. Interestingly, the MXene/catecholamine coating exhibits high conductivity of up to 12 247 S cm-1 and ultrahigh specific EMI shielding effectiveness of 2.0 ×10 5 dB cm2 g-1 , obviouslysuperior to most of the reported MXene materials. Furthermore, the regularly assembled structure also endows the MXene coatings with low infrared emissivities for infrared stealth applications. Therefore, MXene/catecholamine coatings with ultraefficient EMI shielding and low infrared emissivity prove the feasibility of applications in aerospace, military, and wearable devices.

Bio-inspired multifunctional high-performance electromagnetic shielding coatings resistant to extreme space environments

<p>Electromagnetic interference (EMI) shielding materials are vitally important for electronics and spacecrafts operating in space environment. However, how to achieve high EMI shielding performance with good adaptability for various application scenarios and high tolerance to extreme conditions remains a huge challenge. Here, we report a bioinspired EMI shielding coating material with high EMI shielding performance (~100 dB) and wide applicability for multiple applications. Through modulating the multiple interactions among the coating components of cellulose nanofiber (CNF), carbon nanotubes (CNTs) and polydopamine (PDA), such a coating material can adhere to both macro and micro substrates through various coating methods including brush coating, spray coating and dip coating, to provide both comprehensive EMI shielding and Joule heating properties. More importantly, the coating can maintain high EMI shielding performance under the impact of atomic oxygen, ultraviolet light, and rapid thermal shock (from −196 °C to 200 °C), showing great potential in EMI shielding for practical applications in extreme conditions, especially for the exploration of space.</p>

Effect of morphology and content of Ni nanoparticles on electromagnetic shielding coatings with salt resistance and heating performance

Effect of morphology and content of Ni nanoparticles on electromagnetic shielding coatings with salt resistance and heating performance

ВПЛИВ МОРФОЛОГІЇ ПРИРОДНІХ ГРАФІТІВ НА ЕКРАНУЮЧІ ВЛАСТИВОСТІ КОМПОЗИТНИХ МАТЕРІАЛІВ

Optimization of composition for a composite material based on graphite was done in order to increase the effectiveness of electromagnetic shielding. Morphological studies were carried out by optical and electron microscopy. Surface conductivity was determined by a four-probe measurement method. The effectiveness of electromagnetic shielding was studied by the level of attenuation of electromagnetic energy through the sample and the power level of the reflected electromagnetic wave in front of the sample. The dependence of surface conductivity and the efficiency of electromagnetic shielding on the particle size distribution of graphite in a composite material, as well as its density and thickness, has been established. It was experimentally approved that low-density carbon-graphite coatings containing magnetite were sufficiently effective for electromagnetic shielding. The density of the coating depends on their mechanical processing, as well as on the polydispersity of the graphite material. Shielding efficiency can be enhanced by combining layers of different density. A new concept for the manufacture of protective coatings for electromagnetic shielding was proposed taking in the account characteristics of graphite material such as polydispersity and particle structure. Particular attention was paid to the production of new carbon-graphite composites for the manufacture of screens and absorbers of electromagnetic radiation. The radio-absorbing properties of carbon-graphite coatings with different granulometric and chemical composition were analyzed for the first time. Multifunctional composite coatings for electromagnetic shielding can have a wide range of applications such as following: in the military and medical practice, specialized protective clothing, in screens for shielding equipment, rooms, and others.

Tough bonding of metallic layers to hydrocarbon surfaces by depositing Ag films

Metallization of polymer materials is a crucial process in the manufacturing of decorative, wear-resistant and electromagnetic shielding coatings in the automotive, electronics and instrumentation industry.

Preparation and Electromagnetic Shielding Effectiveness of a New Kind of Electromagnetic Shielding Composite Coatings

A new kind of the electromagnetic shielding composite coatings with high performance was prepared using the Ni-Cu-coated glass fibers and nickel powders as fillers and using epoxy resin as binder. The effects of the fibers on the conductivity and electromagnetic shielding effectiveness of the coatings were studied. The study results show as follows: 1) when the optimum ratio of the fillers to epoxy resin is 4:1, the coatings containing 6 wt% the Ni-Cu-coated glass fibers has best conductivity and electromagnetic shielding effectiveness; when the coating layer thickness is 300 μm, the shielding effectiveness of the coatings is up to 43.71-52.31 dB and increased an average of 13.94 dB compared with the nickel powders/ epoxy resin electromagnetic shielding coatings in the frequency range of 0.3-1000 MHz. This offers a new idea to enhance the added value of the glass fibers and the prevention of electromagnetic environmental pollution.

Fluxible Nanoclusters of Fe3O4 Nanocrystal-Embedded Polyaniline by Macromolecule-Induced Self-Assembly

We have prepared Fe3O4 nanocrystal-embedded polyaniline hybrids with well-defined cluster-like morphology through macromolecule-induced self-assembly. These magnetic and electrically conductive composite nanoclusters show flowability at room temperature in the absence of any solvent, which offers great potential in applications such as microwave absorbents and electromagnetic shielding coatings. This macromolecule-induced self-assembly strategy can be readily applied on the fabrication of other ion oxide/conjugated polymer composites to achieve robust multifunctional materials.

Preparation by Electroless Plating and Electromagnetic Shielding Effectiveness of Ni-Cu-Coated Calcium-Magnesium Silicate Whisker

A new kind of Ni-Cu-coated calcium-magnesium silicate whiskers was prepared by electroless plating and characterized by EDS, SEM and XRD. And the preparation and shielding performance of a new kind of Ni-Cu-coated calcium-magnesium silicate whisker/nickel powder/epoxy resin electromagnetic shielding coatings were explained. The study results show the Ni-Cu-coated whisker with micro-sized spinal structure contains 12.4 wt% Ni and 1.35 wt% Cu. When the coating layer thickness is 300 μm, the shielding effectiveness of the coatings containing 4 wt% Ni-Cu-coated calcium-magnesium silicate whisker is up to 39.24-48.52 dB and increased an average of 10.38 dB compared with the nickel powder/epoxy resin electromagnetic shielding coatings in the frequency range of 0.3-1000 MHz. This offers a new idea to raise the levels of the comprehensive utilization of mineral resources and the prevention of electromagnetic environmental pollution.