Jiangsu Engineering Research Centre for Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi 214122, China.
Jiangsu Engineering Research Centre for Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi 214122, China.
Carbohydr Polym. 2022 Nov 15;296:119932. doi: 10.1016/j.carbpol.2022.119932. Epub 2022 Aug 2.
Most bionic leaves cannot autonomously absorb water and maintain high water content like plant leaves, causing the low Vis-NIR spectral similarity to plant leaves. Herein, inspired by the transpiration of plant leaves, a self-driven water vapor-absorbing bionic leaf was prepared by the crosslinking between hygroscopic CaCl and sodium alginate (SA) on the visible spectral simulating materials (VSSM). Based on the synergistic effect of the hygroscopicity of CaCl and the hydrophilia of calcium alginate (CaAlg), the bionic leaf automatically absorbed water vapor from the air according to ambient humidity and temperature. The water vapor-absorbing property of the bionic leaf was adjusted by changing the CaCl concentration (5 wt%-40 wt%), and stable water content of 9.0 %-43.3 % can be obtained in relative humidity of 40-80 %. The CaAlg-based bionic leaf embodied a high spectral correlation coefficient (r ~ 0.987) for the Vis-NIR spectral simulation of plant leaves. The self-driven water vapor absorbing bionic leaves prepared by CaAlg and CaCl provide new insights for the application of bionics, water harvesting from the air, environmental humidity management, and camouflage.
大多数仿生叶子不能像植物叶子那样自主吸收水分并保持高含水量，这导致它们在可见-近红外光谱（Vis-NIR）上与植物叶子的相似度较低。在此，受植物叶子蒸腾作用的启发，通过在可见光谱模拟材料（VSSM）上交联亲水性的氯化钙（CaCl）和海藻酸钠（SA），制备了一种自驱动水汽吸收仿生叶子。基于 CaCl 的吸湿性和钙藻酸钠（CaAlg）的亲水性的协同作用，仿生叶子会根据环境湿度和温度自动从空气中吸收水汽。通过改变 CaCl 浓度（5wt%-40wt%）可以调节仿生叶子的水汽吸收性能，在相对湿度为 40%-80%时可以获得 9.0%-43.3%的稳定含水量。基于 CaAlg 的仿生叶子在 Vis-NIR 光谱模拟植物叶子方面体现出了很高的光谱相关系数（r~0.987）。CaAlg 和 CaCl 制备的自驱动水汽吸收仿生叶子为仿生学应用、从空气中采集水分、环境湿度管理和伪装提供了新的思路。
