Flexible, Reliable, and Lightweight Multiwalled Carbon Nanotube/Polytetrafluoroethylene Membranes with Dual‐Nanofibrous Structure for Outstanding EMI Shielding and Multifunctional Applications

Abstract

In this study, lightweight, flexible, and environmentally robust dual‐nanofibrous membranes made of carbon nanotube (CNT) and polytetrafluoroethylene (PTFE) are fabricated using a novel shear‐induced in situ fibrillation method for electromagnetic interference (EMI) shielding. The unique spiderweb‐like network, constructed from fine CNTs and PTFE fibrils, integrates the inherent characteristics of these two materials to achieve high conductivity, superhydrophobicity, and extraordinary chemical resistance. The dual‐nanofibrous membranes demonstrate a high EMI shielding effectiveness (SE) of 25.7–42.2 dB at a thickness range of 100–520 µm and the normalized surface‐specific SE can reach up to 9931.1 dB·cm2·g−1, while maintaining reliability even under extremely harsh conditions. In addition, distinct electrothermal and photothermal conversion properties can be achieved easily. Under the stimulation of a modest electrical voltage (5 V) and light power density (400 mW·cm−2), the surface temperatures of the CNT/PTFE membranes can reach up to 135.1 and 147.8 °C, respectively. Moreover, the CNT/PTFE membranes exhibit swift, stable, and highly efficient thermal conversion capabilities, endowing them with self‐heating and de‐icing performance. These versatile, flexible, and breathable membranes, coupled with their efficient and facile fabrication process, showcase tremendous application potential in aerospace, the Internet of Things, and the fabrication of wearable electronic equipment for extreme environments.

Superhydrophobic Polysilsesquioxane Nanospike/Glass Microfiber Composite for Separation of Oil–Water Mixtures

“…However, realizing the full potential of superhydrophobic materials has significant challenges. The ability of these materials to withstand harsh conditions, including exposure to corrosive chemicals and intense mechanical stress, remains a significant concern. − The lack of chemical stability and mechanical robustness in superhydrophobic materials compromises their efficacy and longevity in real-world applications, presenting a critical barrier that must be addressed. − For instance, the mechanochemical stability of superhydrophobic materials becomes crucial when utilized for efficient separation of oil–water mixtures. This stability refers to the material’s ability to maintain its inherent superhydrophobic properties over prolonged usage, especially under complex environmental conditions, including high temperatures, strong chemical corrosion, and mechanical abrasion.…”

Superhydrophobic, Highly Conductive, and Trilayered Fabric with Connected Carbon Nanotubes for Energy-Efficient Electrical Heating

“…In addition, the effect of the CNT concentration on the electrical conductivity of nanofibrous membranes is studied in detail, and the influence of the TiO 2 nanoparticle concentration on the porous structure is also revealed. Eventually, the fabricated membranes showed intriguing rapid and energy-efficient electric-heating capacity, indicating promising utility for the next generation of electrical heating textiles. − …”