Li Keqiao, Lin Chongjia, Liu Gongze, Wang Guang, Ma Wei, Li Meng, Li Yang, Huang Baoling
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China.
State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China.
Adv Mater. 2024 Feb;36(7):e2308189. doi: 10.1002/adma.202308189. Epub 2023 Dec 7.
Real-time control over infrared (IR) radiation of objects is highly desired in a variety of areas such as personal thermal regulation and IR camouflage. This requires the dynamic modulation of IR emissivity in a stepless manner over a wide range (>50%), which remains a daunting challenge. Here, an emissivity modulation phenomenon is reported in stacked 2D Ti C T MXene nanosheets, from 12% to 68% as the intercalation/discharging of water molecules within the interlayers. The intercalation of water molecules dynamically changes the electronic properties and the complex permittivity in IR frequencies of Ti C T . This emissivity modulation is a stepless and reversible process without the assistance of any external energy input. Further, intercalating cellulose nanofibers into the Ti C T interlayers makes this dynamic process highly repeatable. Last, a sweat-responsive adaptive textile that can improve thermal comfort of human body under changes in metabolic rates and environmental conditions is demonstrated, showing great potential of this mechanism in passive on-demand radiation modulation.
在个人热调节和红外伪装等多个领域，对物体的红外（IR）辐射进行实时控制是非常必要的。这需要在很宽的范围内（>50%）以无级方式动态调制红外发射率，而这仍然是一项艰巨的挑战。在此，报道了在堆叠的二维TiCT MXene纳米片中的发射率调制现象，随着水分子在层间的嵌入/脱嵌，发射率从12%变化到68%。水分子的嵌入动态地改变了TiCT在红外频率下的电子性质和复介电常数。这种发射率调制是一个无级且可逆的过程，无需任何外部能量输入的辅助。此外，将纤维素纳米纤维插入TiCT层间使这个动态过程具有高度的可重复性。最后，展示了一种汗液响应型自适应纺织品，它可以在代谢率和环境条件变化的情况下提高人体的热舒适度，显示出这种机制在被动按需辐射调制方面的巨大潜力。
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