writer：Feng, SJ (Feng, Shuangjiang) [1] ; Yao, L (Yao, Lei) [2] ; Chen, X (Chen, Xi) [1] ; Liu, CH (Liu, C
keywords：Asymmetric interfacesOptical -wetting selectivityRadiative coolingThermal insulationJanus -type nanofabric
source：期刊
Issue time：2023年
All-weather personal thermal regulation has far been challenged by variable environments especially the regulatory failure caused by highly-dense solar radiation, low environmental radiation and the fluctuated epidermal moisture in different seasons. Herein, from the design of interface selectivity, dual-asymmetrically optical and wetting selective polylactic acid-based (PLA) Janus-type nanofabric is proposed to achieve on-demand radiative cooling and heating as well as sweat transportation. Hollow TiO2 particles are introduced in PLA nanofabric causing high interface scattering (-99%) and infrared emission (-91.2%) as well as surface hydrophobicity (CA > 140 degrees). The strictly optical and wetting selectivity help achieve -12.8 & DEG;C of net cooling effect under > 1500 W/ m2 of solar power and -5 & DEG;C of cooling advantage higher than cotton fabric and sweat resistance simultaneously. Contrarily, the semi-embedded Ag nanowires (AgNWs) with high conductivity (0.245 & omega;/sq) endows the nanofabric with visible water permeability and excellent interface reflection for thermal radiation from body (>65%)thus causing-7 & DEG;C of thermal shielding. Through simple interface flipping, synergistical cooling-sweat reducing and warming-sweat resisting can be achieved to satisfy the thermal regulation in all weather. Compared with conventional fabrics, multi-functional Janus-type passive personal thermal management nanofabrics would be of great significance to achieve the personal health maintenance and energy sustainability.