Asymmetric Dual-Responsive Switch-Based Janus Photothermal Mask for Dynamic Humidity-Thermal Regulation.

Maintaining a dynamic humidity-thermal balance within the skin-device microclimate is critical for enhancing wearability and minimizing physiological and psychological discomfort. Herein, we present an asymmetric dual-responsive MXene/Viscose-PP (MVP) actuator integrated into a Janus photothermal mask for skin-mask microclimate dynamic humidity-thermal regulation. The MVP actuator switch with asymmetric bending deformation can achieve autonomous on-off switching under temperature and humidity stimulation. The Janus photothermal mask enables unidirectional transport of exhaled breath condensate to the outer hydrophilic layer and enhances evaporation efficiency by 22.5 times. The synergistic integration of the Janus photothermal interface and the MVP actuator switch establishes a closed-loop dynamic humidity-thermal regulation system. The smart switch-based Janus photothermal mask achieves a state of humidity-thermal comfort during prolonged wearing. Such a closed-loop strategy offers a transformative route toward next-generation adaptive personal protective equipment and smart textiles, enabling autonomous human-machine humidity-thermal interaction without external energy consumption.