Flexible Radiative Cooling Textiles Based on Composite Nanoporous Fibers for Personal Thermal Management

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Abstract

Passive radiative cooling textiles can reflect sunlight and dissipate heat directly to the outside space without any energy input. However, radiative cooling textiles with high performance, large scalability, cost effectiveness, and high biodegradability are still uncommon. Herein, we exploit a porous fiber-based radiative cooling textile (PRCT) via nonsolvent-induced phase separation and scalable roll-to-roll electrospinning technology. Nanopores are introduced into single fibers, and the pore size can be accurately optimized by managing the relative humidity of the spinning environment. The anti-ultraviolet radiation and superhydrophobicity of textiles were improved by the introduction of core-shell silica microspheres. An optimized PRCT yields a strong solar reflectivity of 98.8% and atmospheric window emissivity of 97%, which results in a sub-ambient temperature drop of 4.5 °C, with the solar intensity over 960 W·m-2 and 5.5 °C at night. For personal thermal management, it is demonstrated that the PRCT can obtain a temperature drop of 7.1 °C compared to the bare skin under direct sunlight. Given the excellent optical and cooling properties, flexibility, and self-cleaning property, PRCT was demonstrated to be a potential candidate for commercial applications in multifarious complex scenarios to afford a style for global decarbonization.

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