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Dynamically Tunable Subambient Daytime Radiative Cooling Metafabric with Janus Wettability

机译：Dynamically Tunable Subambient Daytime Radiative Cooling Metafabric with Janus Wettability

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摘要

Incorporating zero-energy-input cooling technology into personal thermalmanagement (PTM) systems is a promising solution for preventing heatrelatedillnesses while reducing energy consumption. Although conceptsfor passive radiative cooling materials are proposed, achieving subambientcooling performance while providing good wearing comfort remains achallenge. Here, a moisture-wicking nonwoven metafabric is reported thatassembles radiative cooling and evaporative heat dissipation to achievehigh-performance thermal and moisture comfort management. This metafabricdemonstrates excellent spectral-selectivity (sunlight reflection of ≈92,atmospheric window thermal emissivity of ≈97) and Janus wettabilitythrough large-scale electrospinning and hierarchical design, and also inheritssuperior elasticity, air/moisture permeability of nonwoven fabric. Subambienttemperature drops of ≈6.5 ℃ (≈750 W m?2 solar intensity) for stand-alonemetafabric are observed. Thanks to the moisture-wicking effect (water evaporationrate of 0.31 g h~（?1） and water transport index of 1220) of metafabricthat enables fast evaporation of sweat, a maximum generation of 1 mL h（?1）of sweat can cool the skin, thus reducing the excessive sweating risk afterintense exercise. Additionally, the cooling performance of metafabric can beregulated by applying various strains (0–100). The cost-efficiency and goodwearability of metafabric provide an innovative way to sustainable energy,smart textiles, and thermal wet comfort applications.

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