Fabrication of lightweight and flexible silicon rubber foams with ultra-efficient electromagnetic interference shielding and adjustable low reflectivity

Abstract

Lightweight and efficient electromagnetic interference (EMI) shielding composites are of great significance for the development of next generation communication technology, wearable equipment and high-power electronic equipment.

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

“…Figure S15 illustrated some of the recent advances made in the development of EMI shielding materials [ 16 , 30 , 40 , 46 , 79 – 84 ], which are compared with the overall EMI shielding effectiveness and reflection of the layered foam/film PVDF nanocomposites reported in this study. The superior electrical conductivity is often prerequisite for achieving high EMI SE in the traditional EMI shielding materials.…”

“…Such gradient structures can achieve both low reflectivity and high EMI SE by combining (i) the absorption layer, with excellent impedance matching and high attenuation capability, and (ii) the reflection layer with superior electrical conductivity and high reflection capability. A waterborne polyurethane/FeCo@rGO/Ag-coated expanded polymer bead (EBAg) composite foam exhibited an average EMI SE of 84 dB with an average SE R of 0.32 dB [ 46 , 47 ]. Despite the importance of shielding materials with ultralow reflection, the field is at an early stage, and there are very few research works devoted to the manufacture of efficient ultralow reflection shielding materials.…”

Scalable, superelastic, and superhydrophobic MXene/silver nanowire/melamine hybrid sponges for high-performance electromagnetic interference shielding

“…8,9 Recently, the demand for lightweight EMI shielding materials has been increasingly strong, especially for many emerging areas such as aircraft, spacecraft, automobiles, portable devices, etc. [10][11][12][13] Rational design of porous structures with a high specific surface area can not only realize the lightweight of EMI shielding materials, but also provide more space for multiple internal reflection and scattering of electromagnetic waves, so as to attenuate more electromagnetic energy. [14][15][16] For lightweight shielding materials, their EMI shielding performance is usually evaluated by the absolute EMI shielding effectiveness (SE) value (SSE/t, SE divided by the density and thickness of the sample), which incorporates three factors: EMI SE, density and thickness.…”

Tailorable, Lightweight and Superelastic Liquid Metal Monoliths for Multifunctional Electromagnetic Interference Shielding

“…Construction of LM-based conductive network at low filler contents along with highly self-standing, reliable, and reproducible flexible composite has great significance to extend practical applications of LM. Foaming is an effective method to construct conductive networks and reduce the content of fillers, including freeze-drying [ 22 – 24 ], supercritical carbon dioxide foaming [ 25 , 26 ], chemical foaming [ 27 ], and sacrificial templates [ 3 , 28 ], Unfortunately, the majority of traditional foaming process is not suitable to make LM-based polymer matrix foam structure due to migration and poor compatibility. Therefore, it is still a great challenge to develop an efficient and feasible processing method for the preparation of macroscopically self-standing, reliable LM composites.…”