Feng Qian, Wang Luzhen, Wan Zhangmin, Bu Xiangting, Deng Qiaoyun, Li Dagang, Chen Chuchu, Xu Zhaoyang
College of Material Science and Engineering, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu Province 210037, PR China.
Departments of Chemical and Biological Engineering, Chemistry and Wood Science, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
Int J Biol Macromol. 2023 Oct 1;250:126059. doi: 10.1016/j.ijbiomac.2023.126059. Epub 2023 Aug 5.
The ultraviolet (UV) blocking performance of current bio-based devices is always limited by delignification and exploited chemical treatment. Lignocellulosic nanofibril (LCNF) is a promising green alternative that could efficiently impede UV radiation. Herein, we proposed a robust LCNF film that achieved 99.8 ± 0.19 % UVB blocking, 96.1 ± 0.23 % UVA blocking, and was highly transparent without complex chemical modification. Compared to conventional lignin composites, this LCNF method involves 29.5 ± 2.31 % lignin content directly extracted from bamboo as a broad-spectrum sun blocker. This bamboo-based LCNF film revealed an excellent tensile strength of 94.9 ± 3.6 MPa and outstanding stability, adapting to the natural environment's variability. The residual hemicellulose could also embed the link between lignin and cellulose, confirming high lignin content in the network. The connection between lignin and hemicelluloses in the cellulose network was explored and described for the fibrillation of lignocellulosic nanofibrils. This research highlights the promising development of LCNFs for UV protection and bio-based solar absorption materials.
当前生物基器件的紫外线（UV）阻挡性能一直受到脱木质素和采用的化学处理的限制。木质纤维素纳米纤维（LCNF）是一种很有前景的绿色替代品，能够有效阻挡紫外线辐射。在此，我们提出了一种坚固的LCNF薄膜，其实现了99.8±0.19%的UVB阻挡率、96.1±0.23%的UVA阻挡率，并且无需复杂的化学改性就具有高透明度。与传统木质素复合材料相比，这种LCNF方法含有直接从竹子中提取的29.5±2.31%的木质素作为广谱防晒剂。这种基于竹子的LCNF薄膜显示出94.9±3.6MPa的优异拉伸强度和出色的稳定性，能够适应自然环境的变化。残留的半纤维素也可以嵌入木质素和纤维素之间的连接中，证实了网络中木质素含量很高。研究探索并描述了纤维素网络中木质素和半纤维素之间的连接，以用于木质纤维素纳米纤维的原纤化。这项研究突出了LCNF在紫外线防护和生物基太阳能吸收材料方面的良好发展前景。
