Core‐Sheath Nanofibrous Membranes Based on a Phase Change Energy Storage/Radiative Cooling Synergistic Strategy for Personal Thermal Management

Abstract Personal thermal management (PTM) significantly enhances human thermal comfort by alleviating overheating‐induced stress. However, achieving energy‐free cooling, intelligent temperature regulation, lightweight construction, and wearable designs remains challenging. This study introduces a coaxial electrospinning nanofiber membrane with a core‐sheath structure using polyvinyl alcohol as the matrix, phase change microcapsules (PCMC) for energy storage, and nano‐silica (SiO 2 ‐NPs) for radiative cooling. The resultant membrane effectively provides cooling without external energy input. The PVA/SiO 2 ‐30 shell exhibits high solar reflectance (80%) and mid‐to‐long infrared emissivity (95%), while the PCMC‐loaded core prevents leakage during phase transitions, achieving a melting enthalpy of 79.7 J·g − . Under simulated solar radiation, the membrane maintains an equilibrium temperature ≈14.2 °C lower than conventional cotton fabric, demonstrating superior thermal stability. Moreover, the membrane exhibits excellent mechanical performance, with tensile strength of 2.71 MPa, elongation at break of 128%, and lightweight properties (3.125 gm −2 ). The one‐step coaxial electrospinning process simplifies fabrication, enhancing interlayer adhesion and enabling efficient multifunctional textile production. This approach offers significant potential for developing intelligent, lightweight, and energy‐efficient wearable cooling textiles.