Gu Bin, Xu Qihao, Wang Hongkui, Pan Haodan, Zhao Dongliang
School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China.
Institute of Science and Technology for Carbon Neutrality, Southeast University, Nanjing, Jiangsu 210096, China.
ACS Nano. 2023 Sep 26;17(18):18308-18317. doi: 10.1021/acsnano.3c05460. Epub 2023 Sep 13.
Climate change has recently caused more and more severe temperatures, inducing a growing demand for personal thermal management at outdoors. However, designing textiles that can achieve personal thermoregulation without energy consumption in severely hot and cold environments remains a huge challenge. Herein, a hierarchically nanofibrous (HNF) textile with improved thermal insulation and radiative thermal management functions is fabricated for efficient personal thermal management in severe temperatures. The textile consists of a radiative cooling layer, an intermediate thermal insulation layer, and a radiative heating layer, wherein the porous lignocellulose aerogel membrane (LCAM) as intermediate layer has low thermal conductivity (0.0366 W·m·K), ensuring less heat loss in cold weather and blocking external heat in hot weather. The introduction of polydimethylsiloxane (PDMS) increases the thermal emissivity (90.4%) of the radiative cooling layer in the atmospheric window and also endows it with a perfect self-cleaning performance. Solar absorptivity (80.1%) of the radiative heating layer is dramatically increased by adding only 0.05 % of carbon nanotubes (CNTs) into polyacrylonitrile. An outdoor test demonstrates that the HNF textile can achieve a temperature drop of 7.2 °C compared with white cotton in a hot environment and can be as high as 12.2 °C warmer than black cotton in a cold environment. In addition, the HNF textile possesses excellent moisture permeability, breathability, and directional perspiration performances, making it promising for personal thermal management in severely hot and cold environments.
气候变化最近导致气温越来越极端，使得户外个人热管理的需求不断增加。然而，设计出在酷热和严寒环境下无需能源消耗就能实现个人温度调节的纺织品仍然是一项巨大的挑战。在此，制备了一种具有改进的隔热和辐射热管理功能的分级纳米纤维（HNF）纺织品，用于在极端温度下进行高效的个人热管理。该纺织品由辐射冷却层、中间隔热层和辐射加热层组成，其中作为中间层的多孔木质纤维素气凝胶膜（LCAM）具有低导热率（0.0366W·m·K），可确保在寒冷天气中减少热量损失，并在炎热天气中阻挡外部热量。聚二甲基硅氧烷（PDMS）的引入提高了辐射冷却层在大气窗口中的热发射率（90.4%），并赋予其完美的自清洁性能。通过在聚丙烯腈中仅添加0.05%的碳纳米管（CNT），辐射加热层的太阳能吸收率（80.1%）显著提高。户外测试表明，与白色棉布相比，HNF纺织品在炎热环境中可实现7.2°C的降温，在寒冷环境中比黑色棉布温暖高达12.2°C。此外，HNF纺织品具有优异的透湿性、透气性和定向排汗性能，使其在酷热和严寒环境下的个人热管理方面具有广阔前景。
