Wearable Janus-Type Film with Integrated All-Season Active/Passive Thermal Management, Thermal Camouflage, and Ultra-High Electromagnetic Shielding Efficiency Tunable by Origami Process

作者：Li, Xiaolong; Sheng, Xinxin; Fang, Yu; Hu, Xinpeng; Gong, Shang; Sheng, Mengjie; Lu, Xiang^*; Qu, Jinping^*

来源：Advanced Functional Materials, 2023, 33(18).

DOI：10.1002/adfm.202212776

• electromagnetic interference shielding
• thermal camouflage
• thermal management
• wearable

Multifunctional films with integrated temperature adjustment, electromagnetic interference (EMI) shielding, and thermal camouflage are remarkably desirable for wearable products. Herein, a novel Janus-type multifunctional ultra-flexible film is fabricated via continuous electrospinning followed by spraying. Interestingly, in the polyvinyl alcohol (PVA)/phase change capsules (PCC) layer (P-1), the PCC is strung on PVA fibers to form a stable "candied haws stick" structure that obviates slipping or falling off. The film with sufficient melting enthalpy (141.4 J g(-1)) guarantees its thermoregulation capability. Simultaneously, its high mid-IR emissivity (90.15%) endows the film with radiative cooling properties (reducing temperature by 10.13 degrees C). Mechanical strength is significantly improved by superimposing a polylactic acid (PLA) layer (P-2) on its surface. By spraying a thin MXene layer on the PLA surface of P2P1 film, the obtained (MXene/P2P1) MP2P1 film is endowed with satisfactory low-voltage heating, photo-thermal and superior thermal camouflage performance, achieving all-season thermal comfort. Impressively, the flexible MP2P1 film achieves enhanced EMI shielding effect from 50.3 to 87.8 dB through a simple origami process, which simplifies the manufacturing process of high-performance EMI shielding materials. In brief, the multifunctional Janus-type MP2P1 film is an attractive candidate for future wearable products with personalized thermal management and anti-electromagnetic radiation.

• 单位
  广东工业大学; 武汉大学; 华中科技大学