Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, Jiangsu Province, China.
Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/ Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin541004, China.
ACS Appl Mater Interfaces. 2023 Feb 15;15(6):8751-8760. doi: 10.1021/acsami.2c21694. Epub 2023 Jan 31.
Facing the increasingly complex and deteriorated environment, people's thermal comfort and health requirements are expanding. Therefore, wearable materials with integrated functions have progressed rapidly due to the fair compatibility for various functions and precise regulation. In this work, a laminated MXene foam/cellulose@LDH composite membrane was fabricated via a facile process consisting of in situ growth, vacuum filtration, and foaming for asymmetrical personal thermal management and electromagnetic interference shielding. In detail, the Zn-Al LDH side shows a high solar reflectance of 0.89 and an infrared emissivity of 0.97 in the atmospheric window, demonstrating the superior radiative cooling property. In contrast, the outstanding radiative warming performance is revealed by the high solar absorption (0.72) and infrared reflectivity (0.55) of the MXene foam. As a result, prominent temperature differences were achieved during the validation test. Compared to the control group, an 18 °C reduction of the Zn-Al LDH side and a 9.6 °C increment of the MXene foam side were observed, bringing out the excellent optical properties and radiative thermal management performances. What is more, due to the outstanding electrical conductivity of MXene, a rapid and prominent temperature rise to 44.2 °C could be expected by applying a low voltage of 1 V to provide active joule warmth. In addition, hydrophobization and the associated stain resistance were explained by the high water contact angles of obtained membranes. The excellent electromagnetic interference shielding performance (43.9 dB) given by the introduction of MXene provides a prospective candidate to replace the common shielding materials. The results, in general, provide a promising strategy for meeting the updating requirements for comfortable living in a world full of potential thermal and health threats.
面对日益复杂和恶化的环境，人们对热舒适性和健康的要求不断扩大。因此，由于对各种功能的公平兼容性和精确调节，具有集成功能的可穿戴材料发展迅速。在这项工作中，通过包括原位生长、真空过滤和发泡在内的简单工艺，制备了层压 MXene 泡沫/纤维素@LDH 复合膜，用于不对称个人热管理和电磁干扰屏蔽。具体来说，Zn-Al LDH 侧在大气窗口中表现出 0.89 的高太阳反射率和 0.97 的红外发射率，表现出优异的辐射冷却性能。相比之下，MXene 泡沫表现出优异的辐射升温性能，其太阳吸收率（0.72）和红外反射率（0.55）较高。因此，在验证测试中实现了明显的温差。与对照组相比，Zn-Al LDH 侧的温度降低了 18°C，MXene 泡沫侧的温度升高了 9.6°C，这体现了出色的光学性能和辐射热管理性能。更重要的是，由于 MXene 的出色导电性，在施加 1 V 的低电压时，可以迅速且明显地升温至 44.2°C，从而提供主动焦耳热。此外，获得的膜具有高的水接触角，解释了疏水性和相关的抗污性。MXene 的引入赋予了优异的电磁干扰屏蔽性能（43.9 dB），为替代常见的屏蔽材料提供了有前景的候选方案。总的来说，这些结果为满足充满潜在热和健康威胁的世界中对舒适生活的更新要求提供了有前景的策略。
