Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-106 91 Stockholm, Sweden.
ACS Appl Mater Interfaces. 2022 Mar 16;14(10):12693-12702. doi: 10.1021/acsami.2c00718. Epub 2022 Mar 1.
Sustainable materials are needed to mitigate against the increase in energy consumption resulting from population growth and urbanization. Here, we report fully biobased nanocomposite films and coatings that display efficient photothermal activity and selective absorption of ultraviolet (UV) radiation. The nanocomposites with 20 wt % of lignin nanoparticles (LNPs) embedded in a chitosan matrix displayed an efficient UV blocking of 97% at 400 nm along with solar energy-harvesting properties. The reflectance spectra of the nanocomposite films revealed the importance of well-dispersed nanoparticles in the matrix to achieve efficient UV-blocking properties. Finally, yet importantly, we demonstrate the nanocomposites with 20 wt % LNPs as photothermal glass coatings for passive cooling of indoor temperature by simply tailoring the coating thickness. Under simulated solar irradiation of 100 mW/cm, the 20 μm coating achieved a 58% decrease in the temperature increment in comparison to the system with uncoated glass. These renewable nanocomposite films and coatings are highly promising sustainable solutions to facilitate indoor thermal management and improve human health and well-being.
可持续材料对于缓解人口增长和城市化导致的能源消耗增加至关重要。在这里，我们报告了完全基于生物的纳米复合材料薄膜和涂层，它们具有高效的光热活性和对紫外线（UV）辐射的选择性吸收。在壳聚糖基质中嵌入 20wt%木质素纳米颗粒（LNPs）的纳米复合材料在 400nm 处显示出高效的 97%紫外线阻挡率，同时具有太阳能收集性能。纳米复合材料薄膜的反射率谱表明，在实现高效紫外线阻挡性能方面，纳米颗粒在基质中的良好分散是很重要的。最后但同样重要的是，我们展示了 20wt%LNPs 的纳米复合材料作为光热玻璃涂层，通过简单地调整涂层厚度来被动冷却室内温度。在 100mW/cm 的模拟太阳照射下，与未涂层玻璃相比，20μm 的涂层使温度升高降低了 58%。这些可再生的纳米复合材料薄膜和涂层是极具前景的可持续解决方案，有助于室内热管理，改善人类健康和福祉。
