This research focuses on the development of near-infrared light selective transmission film (NIR-LSTF) utilizing wheat straw biomass, extracting lignocellulose and lignin through the acetic acid method. Employing a hydrogel-based approach, lignin was encapsulated and underwent self-assembly both within and atop the hydrogel, enabling initial integration with cellulose. Hot pressing facilitated the thorough amalgamation of lignin into the cellulose matrix, enhancing the NIR-LSTF's resistance to environmental wear and creating a dense structure that minimizes light loss and reflection, thus outperforming traditional materials in optical efficiency and functionality. Moreover, the presence of lignin imparts the material with unique selective absorption characteristics, effectively blocking nearly all ultraviolet light and visible light (approximately 100 % at 610 nm and 78 % at 780 nm), while maintaining a high transmittance rate (∼90 %) in the near-infrared spectrum. This property underscores the films' significant potential in applications demanding near-infrared transparency. The efficacy of NIR-LSTF in the realms of infrared surveillance and privacy protection was assessed, yielding favorable experimental outcomes. This study paves a new pathway for the valorization of agricultural waste biomass within the near-infrared optical domain.

中文翻译：

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将小麦秸秆加工成近红外光选择性透射膜


本研究的重点是利用小麦秸秆生物质开发近红外光选择性透射膜 （NIR-LSTF），通过乙酸法提取木质纤维素和木质素。采用基于水凝胶的方法，木质素被封装并在水凝胶内部和顶部进行自组装，从而能够与纤维素进行初步整合。热压有助于木质素彻底融合到纤维素基质中，增强了 NIR-LSTF 对环境磨损的抵抗力，并创造了一个致密的结构，最大限度地减少了光损失和反射，从而在光学效率和功能方面优于传统材料。此外，木质素的存在赋予了材料独特的选择性吸收特性，有效地阻挡了几乎所有的紫外线和可见光（在 610 nm 处约为 100%，在 780 nm 处约为 78%），同时在近红外光谱中保持高透射率 （∼90 %）。这一特性强调了薄膜在需要近红外透明度的应用中的巨大潜力。评估了 NIR-LSTF 在红外监控和隐私保护领域的疗效，产生了良好的实验结果。本研究为在近红外光学域内实现农业废弃物生物质的价值化铺平了一条新途径。