Lv Chenglong, Zu Mei, Xie Dongjin, Cheng Haifeng
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Materials (Basel). 2021 Mar 14;14(6):1406. doi: 10.3390/ma14061406.
The emulation of the reflectance of green leaf in the solar spectral band (300-2500 nm) has garnered increasing attention from researchers. Currently, various materials have been proposed and investigated as potential bionic leaves. However, the problems such as poor weather durability, heavy metal pollution, and complex preparation technology still persist. Herein, a bionic leaf is prepared from an ultramarine green pigment as the functional material, polyvinylidene fluoride (PVDF) as the film-forming material, and LiCl as the humidizer. To prepare the ultramarine green pigment, the sulfur anion is added into the β cage of the 4A zeolite. The mechanisms and properties were discussed based on X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and spectroscopic methods. The results show that the as-fabricated bionic leaf based on the 4A zeolite-derived ultramarine green pigment was able to demonstrate a high spectral similarity coefficient of 0.91 with the green leaf. Furthermore, the spectral similarity coefficient was increased to 0.94 after being subjected to a simulated rainforest environment for 48 h, which indicated its high weather durability.
对太阳光谱波段（300 - 2500纳米）中绿叶反射率的模拟已引起研究人员越来越多的关注。目前，已提出并研究了各种材料作为潜在的仿生叶片。然而，诸如耐候性差、重金属污染和制备工艺复杂等问题仍然存在。在此，以群青绿色颜料为功能材料、聚偏氟乙烯（PVDF）为成膜材料、LiCl为增湿剂制备了一种仿生叶片。为制备群青绿色颜料，将硫阴离子添加到4A沸石的β笼中。基于X射线衍射（XRD）、扫描电子显微镜（SEM）、拉曼光谱和光谱方法对其机理和性能进行了讨论。结果表明，基于4A沸石衍生的群青绿色颜料制备的仿生叶片与绿叶的光谱相似系数高达0.91。此外，在模拟雨林环境中放置48小时后，光谱相似系数提高到了0.94，这表明其具有高耐候性。
