Liu Hui, Yu Jianyong, Zhang Shichao, Ding Bin
Innovation Center for Textile Science and Technology, College of Materials Science and Engineering, Donghua University, Shanghai201620, China.
Nano Lett. 2022 Dec 14;22(23):9485-9492. doi: 10.1021/acs.nanolett.2c03585. Epub 2022 Dec 5.
Face masks, as effective measures for passive air pollution control, are of fundamental importance, especially with the outbreak of emerging infectious diseases. Most existing masks are dense or thick, resulting in a lack of thermal/humidity comfort level; despite being worn tightly, they show limited PM/pathogen removal. Here, we use a facile strategy to create air-conditioned masks using heterogeneous nanofibrous networks, based on an electrospinning/netting technique. Manipulation of the phase separation and self-assembly of charged jet/droplets by control of humidity-induced double diffusion and Taylor cone instability allows for the generation of air-conditioned masks consisting of radiative cooling wrinkled nanofibers and 2D nanostructured networks. Our masks show desirable microenvironment with high-efficiency PM removal (>99.988%), low air resistance (0.07% of atmospheric pressure), and remarkable radiative cooling capacity (∼2.8 °C temperature and ∼10% humidity drop), making high-performance filtration and temperature/humidity management "always online". This work should make possible the development of high-performance, energy-saving, and scalable fiber textiles for various applications.
口罩作为被动控制空气污染的有效措施至关重要，尤其是在新发传染病爆发时。现有的大多数口罩致密或厚实，导致缺乏热/湿度舒适度；尽管佩戴紧密，但它们对颗粒物/病原体的去除效果有限。在此，我们基于静电纺丝/编织技术，采用一种简便策略，利用异质纳米纤维网络制造出带空调功能的口罩。通过控制湿度诱导的双扩散和泰勒锥不稳定性来操纵带电射流/液滴的相分离和自组装，能够制造出由辐射冷却皱纹纳米纤维和二维纳米结构网络组成的带空调功能的口罩。我们的口罩展现出理想的微环境，具有高效的颗粒物去除能力（>99.988%）、低空气阻力（大气压力的0.07%）以及显著的辐射冷却能力（约2.8℃的温度下降和约10%的湿度下降），使高性能过滤和温度/湿度管理“始终在线”。这项工作应能推动开发用于各种应用的高性能、节能且可扩展的纤维纺织品。
