Hu Anran, Li Min, Zhang Liping, Wang Chunxia, Fu Shaohai
Jiangsu Engineering Research Center for Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education Wuxi Jiangsu 214122 China
RSC Adv. 2019 Dec 16;9(71):41438-41446. doi: 10.1039/c9ra08312j. eCollection 2019 Dec 13.
Poor stability, the toxicity of the used colorants and complex structure are the main problems for the current spectral simulation materials for vegetation. In this paper, a lightweight (0.052 g cm) and environmentally friendly bionic porous spectrum simulation material (BPSSM) was developed to simulate the Vis-NIR spectra of natural leaves. The porous structure of BPSSM was used to simulate the mesophyll tissue, which endows the BPSSM with a near-infrared plateau. Moreover, the relationship between pore structure (size, open porosity and volume density) and near-infrared plateau in the spectrum was also studied. The chlorophyll of leaves was simulated by vat dyes or organic pigments, and the green apex and red edge characteristics in the visible region were further adjusted by the chlorophyllin sodium copper salt. The water absorption of BPSSM with 100-120% water contents are consistent with the natural leaves spectral curve channel. Finally, the spectral correlation coefficients ( ) between BPSSM and different natural leaves are up to 0.984, suggesting that the BPSSM is universally applicable for the simulation of different leaves. Interestingly, the average radiant temperature difference between BPSSM and natural leaves is 0.25 °C within 24 hours, indicating it has similar thermal infrared properties to natural leaves. Moreover, the BPSSM can be combined with textiles to obtain a composite fabric, and its breaking strength and photostability were explored.
稳定性差、所用着色剂的毒性以及结构复杂是当前植被光谱模拟材料面临的主要问题。本文研制了一种轻质（0.052 g/cm）且环境友好的仿生多孔光谱模拟材料（BPSSM），用于模拟天然叶片的可见-近红外光谱。BPSSM的多孔结构用于模拟叶肉组织，使其具有近红外平台。此外，还研究了孔隙结构（尺寸、开孔率和体积密度）与光谱中近红外平台之间的关系。叶片中的叶绿素由还原染料或有机颜料模拟，叶绿素铜钠盐进一步调节可见光区域的绿峰和红边特征。含水量为100%-120%的BPSSM的吸水情况与天然叶片光谱曲线通道一致。最后，BPSSM与不同天然叶片之间的光谱相关系数高达0.984，表明BPSSM普遍适用于不同叶片的模拟。有趣的是，BPSSM与天然叶片在24小时内的平均辐射温度差为0.25℃，表明其具有与天然叶片相似的热红外特性。此外，BPSSM可与纺织品结合制成复合织物，并对其断裂强度和光稳定性进行了探索。
