Li Xiansheng, Liu Meiling, Chen Ken, Li Lanxin, Pei Gang, Zhao Bin
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China.
National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China.
Nanophotonics. 2024 Jun 3;13(17):3067-3075. doi: 10.1515/nanoph-2023-0930. eCollection 2024 Jul.
The heat generation of the human body dramatically varies between resting and active status, so dynamic heat dissipation is required to ensure optimal thermal comfort. Herein, we propose a spectrally self-adaptive smart fabric (SSSF) by covering polyester fabric with silver nanowires, which autonomously adjusts its emissivity in response to the body's movement status from dry to wet states. During periods of inactivity, the SSSF maintains radiative heat insulation with a low emissivity state of 0.39. Conversely, during vigorous physical activity, its emissivity is improved to 0.83 when the sweat penetrates the SSSF, facilitating greater heat dissipation. Comparative experiments demonstrate the superior thermal management capabilities of the SSSF, with a 19.5 % reduction in heat dissipation power relative to traditional fabrics when in the low emissivity mode, and an impressive 67.6 % enhancement in heat dissipation power as it changes from low to high emissivity mode. This work provides an adaptive approach to emissivity modulation, offering an effective solution for dynamic heat dissipation of humans across various states of activity, thereby enhancing personal thermal comfort.
人体在静止和活动状态下的产热情况差异巨大，因此需要动态散热以确保最佳的热舒适度。在此，我们通过用银纳米线覆盖聚酯织物，提出了一种光谱自适应性智能织物（SSSF），它能根据人体从干燥到湿润状态的运动状况自动调节其发射率。在不活动期间，SSSF以0.39的低发射率状态维持辐射隔热。相反，在剧烈体育活动期间，当汗水渗透到SSSF中时，其发射率提高到0.83，有助于增强散热。对比实验证明了SSSF卓越的热管理能力，在低发射率模式下，相对于传统织物，散热功率降低了19.5%，而当它从低发射率模式转变为高发射率模式时，散热功率显著提高了67.6%。这项工作提供了一种发射率调制的自适应方法，为人类在各种活动状态下的动态散热提供了有效的解决方案，从而提高了个人热舒适度。
