Hierarchical Phase Change Fiber Membranes with Organic-Inorganic Hybrid Interfaces for High-Performance Thermal Regulation and Electromagnetic Shielding

The rapid development of intelligent wearable devices increases the need for materials that provide effective thermal management and electromagnetic shielding, yet integrating rapid thermal response, sustained heat buffering, and electromagnetic protection within a flexible membrane remains challenging. Phase change materials offer latent heat storage, but their integration with functional fillers is hindered by limited flexibility and weak interfacial adhesion, which disrupts functional layer continuity and diminishes performance. Here, we construct a paraffin wax@polyvinylidene fluoride (PP) fibrous membrane with an organic-inorganic Polyaniline/MXene (PANI/MXene) hybrid coating. PANI forms a flexible and hydrophilic surface that facilitates the uniform deposition and interfacial integration of MXene nanosheets, enabling the formation of a continuous conductive network. This hybrid coating enables rapid photothermal heating, efficient Joule heating, and strong electromagnetic shielding. With a latent heat storage capability provided by the phase change layer, the membrane shows a temperature rise of 26.2 °C under AM 1.5 irradiation, heating up to 54.5 °C at 3.5 V voltage, and electromagnetic shielding effectiveness exceeding 40 dB. This work demonstrates a stable and scalable coating strategy for next-generation wearable materials.