School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013 Jiangsu Province, China.
Institute of Green Chemistry and Chemical Technology, Jiangsu University, Zhenjiang 212013, China.
ACS Appl Mater Interfaces. 2020 Mar 11;12(10):12285-12293. doi: 10.1021/acsami.9b20865. Epub 2020 Feb 27.
Outdoor cold stress often causes an undesired threat to public health, but devising an efficient strategy to achieve localized outdoor warming of the human body is still a great challenge. Polar bear pelt can absorb sunlight and reflect thermal radiation generated inside the body, which helps in adapting to the cold environment. Inspired by the radiation control strategy of the polar bear pelt, this study reports a porous Ag/cellulose/carbon nanotube (CNT)-laminated nanofiber membrane, in which one side of the cellulose basement membrane is coated with CNTs using a foam finishing process and the Ag layer is deposited on the other side by magnetron sputtering. Based on the high solar radiation absorptivity from CNT coating and the high infrared radiation reflectivity from Ag coating, the biomimetic membrane provides radiation warming by maximizing the heat input from the sun and minimizing the human radiation heat output. Because of excellent electrical conductivity, the Ag layer can work as a wearable heater to induce fast thermal response and uniform electroheating for extra warmth under a low supplied voltage. Moreover, the biomimetic membrane possesses porosity, hydrophilicity, breathability, flexibility, and mechanical stability, suggesting its huge potential for outdoor personal thermal management. Because of their versatility, the applications of the biomimetic membranes may be extended to wearable electronics, smart garments, and thermal control materials.
户外寒冷应激常常对公众健康造成不良威胁，但设计一种有效的策略来实现人体局部户外加热仍然是一个巨大的挑战。北极熊的皮毛可以吸收阳光并反射体内产生的热辐射，这有助于适应寒冷的环境。受北极熊皮毛辐射控制策略的启发，本研究报告了一种多孔 Ag/纤维素/碳纳米管 (CNT)-层压纳米纤维膜，其中纤维素基底膜的一侧使用泡沫整理工艺涂覆 CNT，另一侧通过磁控溅射沉积 Ag 层。基于 CNT 涂层的高太阳辐射吸收率和 Ag 涂层的高红外辐射反射率，仿生膜通过最大限度地从太阳获取热量并最小化人体辐射热量输出来提供辐射加热。由于出色的导电性，Ag 层可用作可穿戴加热器，在低电压供应下诱导快速热响应和均匀的电热以提供额外的温暖。此外，仿生膜具有多孔性、亲水性、透气性、柔韧性和机械稳定性，这表明其在户外个人热管理方面具有巨大的潜力。由于其多功能性，仿生膜的应用可能扩展到可穿戴电子设备、智能服装和热控材料。
