Zeng Shiyi, Zhang Shenchong, Liu Xiaogang, Zhao Huifang, Guo Daliang, Tong Xin, Li Jing
School of Environmental and Natural Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China.
Nanomaterials (Basel). 2022 Jul 26;12(15):2561. doi: 10.3390/nano12152561.
Lignin nanoparticles (LNP) with various morphologies could be prepared with solvent-antisolvent methods. However, the employed toxic chemicals limited its large-scale application. In this study, an extremely green method using only ethanol and water as solvent and antisolvent was reported. Besides, with the syringaldehyde (SA) addition and its anchoring action on the lignin particles, a forming process of the tailed structure was observed and resulted. Moreover, the improved electronegativity originating from the phenolic hydroxyl groups enhanced the size distribution uniformity, and the new absorption peaks at 1190 cm demonstrated the involvement of SA in the LNP formation. Lastly, the tailed lignin nanoparticles (T-LNP) composited with, respectively, polyvinyl alcohol, chitosan, cellulose nanofibers, cationic etherified starch, and sodium alginate were successfully prepared. The outstanding UV-shielding and free radical scavenging properties in the above composites showed their great potential in wide applications in packaging materials.
采用溶剂-反溶剂法可制备出具有多种形态的木质素纳米颗粒（LNP）。然而，所使用的有毒化学物质限制了其大规模应用。在本研究中，报道了一种仅使用乙醇和水作为溶剂和反溶剂的极其绿色的方法。此外，随着丁香醛（SA）的添加及其对木质素颗粒的锚定作用，观察到并形成了尾状结构的形成过程。而且，源自酚羟基的增强的电负性提高了尺寸分布均匀性，并且在1190 cm处的新吸收峰表明SA参与了LNP的形成。最后，成功制备了分别与聚乙烯醇、壳聚糖、纤维素纳米纤维、阳离子醚化淀粉和海藻酸钠复合的尾状木质素纳米颗粒（T-LNP）。上述复合材料中出色的紫外线屏蔽和自由基清除性能表明它们在包装材料的广泛应用中具有巨大潜力。
