A Multifunctional Flexible Composite Film with Excellent Multi‐Source Driven Thermal Management, Electromagnetic Interference Shielding, and Fire Safety Performance, Inspired by a “Brick–Mortar” Sandwich Structure

Abstract

The rapid development of portable flexible electronic devices means a multifunctional composite film with excellent thermal management capability, high electromagnetic interference (EMI) shielding, and a strong fire safety performance is urgently required. In this paper, inspired by a "brick-mortar" sandwich structure, phase change capsules (PCCs) and MXene nanosheets are prepared. Subsequently, a one-step vacuum-assisted filtration method is used to fabricate a multifunctional flexible PCC/MXene/polyvinyl alcohol (PMP) phase change composite film with high light-to-thermal conversion efficiency, Joule heating generation, fire safety, and EMI shielding effects. The superior preparation technology endows the film with multi-source driven thermal management capabilities and excellent EMI shielding effectiveness values (43.13 dB). In addition, the PMP film exhibits good flexibility and high enthalpy (136.8 J g −1 ). Surprisingly, the PMP film's excellent fire safety properties improve its reliability and safety. In summary, the simple preparation technique and outstanding overall performance of the PMP films provide broad application prospects in advanced thermal management and EMI shielding in wearable products.

Sandwich-Structured Surface Coating of a Silver-Decorated Electrospun Thermoplastic Polyurethane Fibrous Film for Excellent Electromagnetic Interference Shielding with Low Reflectivity and Favorable Durability

“…Finally, only a little part of EM waves can pass through the film. 54 To assess the significance of this work, a comparison of the EMI SE with the different R and CA values of the reported polymeric EMI shielding materials is summarized in Figure 9 and Table S1. As we all know, excellent electrical conductivity is the basis for attaining an outstanding EMI shielding performance, which usually represents high reflection of EM waves due to impedance mismatch in materials, leading to secondary irradiation pollution.…”

A Trimode Thermoregulatory Flexible Fibrous Membrane Designed with Hierarchical Core–Sheath Fiber Structure for Wearable Personal Thermal Management

“…Solar energy, as an inexhaustible and clean natural energy resource, has played a vital role in various solar–thermal conversion fields. Combining photoresponsive materials with PCMs has the potential to boost energy storage and facilitate continuous heating behavior based on sunlight. − Furthermore, electrodriven heating has been demonstrated as a compensatory option for further expanding the application scenarios, especially in cloudy, rainy conditions or indoor space. ,− …”

One-Pot Fabrication of an MXene-ZrP@PDA Heterojunction for Enhanced Corrosion/Wear Resistance of Waterborne Epoxy Coatings

“…1−4 MXene is a two-dimensional (2D) transitionmetal carbide/nitride/carbonitride nanomaterial that was discovered in 2011. 5 Due to its excellent physical and chemical properties, it is widely used in energy storage, 6 photocatalysis, 7 electromagnetic shielding, 8 and other fields. 9,10 The enhancement of the coating protection ability through the use of MXene as the filler has also been reported.…”

“…The incorporation of nanomaterials into WEP coatings is an effective solution to improve their corrosion and/or friction resistance. − MXene is a two-dimensional (2D) transition-metal carbide/nitride/carbonitride nanomaterial that was discovered in 2011 . Due to its excellent physical and chemical properties, it is widely used in energy storage, photocatalysis, electromagnetic shielding, and other fields. , The enhancement of the coating protection ability through the use of MXene as the filler has also been reported. However, the natural restacking tendency of MXene nanosheets limits its performance.…”