posted on 2022-01-07, 16:36authored byDongyang Miao, Ningbo Cheng, Xianfeng Wang, Jianyong Yu, Bin Ding
Personal
cooling textiles are a promising energy-free pathway for
confronting serious heat-related public health threats and improving
industrial worker productivity. Current cooling strategies mainly
focus on passive daytime radiation, and there is a lack of research
on all-day cooling methods which utilize synergistic radiative, conductive,
and evaporative heat dissipation. Herein, we demonstrate a hierarchical
polyurethane/silicon nitride fibrous membrane with Janus wettability
fabricated via a scalable electrospinning method followed by single-side
hydrophilic plasma treatment. High angular-dependent solar reflectance
(91%) and human body infrared emittance (93%) allow for a temperature
drop of ∼21.9 °C under direct sunlight and ∼2.8
°C at night compared with traditional cotton. The innovative
integration of Janus wettability and heat conduction in hierarchically
designed textiles ensures a minimum sweat consumption of 0.5 mL h–1, avoiding harmfully excessive perspiration. The excellent
all-day cooling performance of this hierarchical textile presents
great advantages for smart textile, energy-saving, and personal cooling
applications.