Whiteness is an intriguing property in some creature surfaces and usually originates from broadband multi-scattering by the refined structures. In this article, we report that Boehmeria nivea, a widely distributed tropical and subtropical plant, has a highly reflective layer on the lower surface of the leaf. Morphological characterization demonstrates that the layer consists of numerous wrinkled micro-filaments, forming a disordered porous network to efficiently scatter visible light. Moreover, the white layer is shown to exhibit a protection function by reflecting incident light when exposed to high radiation. The reflective layer can slightly improve the absorption by the leaves when light is incident on the upper surface of the leaves. In addition, the porous layer shows hydrophobicity. To mimic the white layer, a well-established electrospinning process is used to fabricate porous polymeric membranes, consisting of nano-wrinkled filaments with micro-sized diameter. Finally, the artificial membranes are demonstrated to have a light-shielding function in a photo-chromic experiment and a light-management ability for quantum dot film.

中文翻译：

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Boehmeria nivea叶灵感上的白色毛状层，用于反射涂料。

白度在某些生物表面是一种令人着迷的属性，通常源于精细结构对宽带的多重散射。在这篇文章中，我们报告Boehmeria nivea是一种分布广泛的热带和亚热带植物，在叶片的下表面具有高反射层。形态学表征表明该层由许多起皱的微丝组成，形成无序的多孔网络以有效散射可见光。而且，显示出白色层在暴露于高辐射下时通过反射入射光表现出保护功能。当光入射在叶子的上表面上时，反射层可以稍微改善叶子的吸收。另外，多孔层显示出疏水性。为了模仿白色层，一种成熟的静电纺丝工艺用于制造多孔聚合物膜，该膜由具有微细直径的纳米皱纹长丝组成。最后，人造膜在光致变色实验中被证明具有遮光功能和量子点膜的光管理能力。