标题： 基于纤维素的反射型液晶薄膜作为光学滤波器和太阳能增益调节器 显示英文标题

标题： Cellulose-Based Reflective Liquid Crystal Films as Optical Filters and Solar Gain Regulators

摘要： 许多设计合成材料与光相互作用的有前途的方法涉及固体光学单晶和具有折射率空间周期性变化的纳米加工光子晶体结构。 尽管它们的高成本限制了当前的技术应用，但值得注意的是，这种光子和光学各向异性材料在自然界中也有所进化，并能够实现光的窄带或宽带光谱反射。 在这里，我们使用生物材料纤维素纳米晶体的自组装来获得具有螺旋状和向列相类似组织的三层薄膜，这种组织模仿了Plusiotis resplendens甲虫翅膀中发现的无偏振敏感的反射器。 这些薄膜通过偏振光学显微镜和圆二色性光谱分析以及扫描和透射电子显微镜进行了表征。 这些薄膜在光学光谱的可见光和近红外区域表现出可调的高反射率，可能在从颜色滤波器到智能服装设计以及太阳能增益调节建筑技术的应用中发挥作用。 显示英文摘要

摘要： Many promising approaches for designing interactions of synthetic materials with light involve solid optical monocrystals and nanofabricated photonic crystal structures with spatially periodic variations of refractive index. Although their high costs limit current technological applications, remarkably, such photonic and optically anisotropic materials have also evolved throughout nature and enable narrow or broad-band spectral reflection of light. Here we use self-assembly of biomaterial cellulose nanocrystals to obtain three-layer films with helicoidal and nematic-like organization of the cellulose nanoparticles, which mimics naturally occurring polarization-insensitive reflectors found in the wings of Plusiotis resplendens beetles. These films were characterized with polarized optical microscopy and circular dichroism spectrometry, as well as scanning and transmission electron microscopies. These films exhibit high reflectivity tunable within the visible and near-infrared regions of the optical spectrum and may find applications ranging from color filters to smart cloth designs and in solar-gain-regulating building technologies.