Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao 266042, China.
Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao 266042, China.
Carbohydr Polym. 2022 Feb 1;277:118829. doi: 10.1016/j.carbpol.2021.118829. Epub 2021 Oct 30.
Co-assembly of metal ion and cellulose nanocrystals (CNC) is a promising strategy to fabricate novel iridescent CNC materials with advanced applications. By combining ultrasonication pretreatment and vacuum-assisted self-assembly (VASA) technique, a facile and rapid strategy is proposed to prepare the Mn-doped carboxylated CNC (C-CNC) iridescent films with multifunctional application. The ultrasonication pretreatment temporarily disassembles the aggregates of C-CNC nanorods caused by the electrostatic interaction between negative charged C-CNC and Mn. The subsequent VASA process accelerates the self-assembly of chiral liquid crystals prior to the re-agglomeration of C-CNC by the bridge effect of Mn. Furthermore, the as-prepared Mn/CNC film exhibits a rapid and visible color change in ammonia atmosphere along with the formation of MnO. The reversible change can be realized by the stimulation of reducing agent. The derived MnO/C-CNC composite film displays efficient removal of methylene blue dye in aqueous solution by both of adsorption and degradation procedure.
金属离子与纤维素纳米晶体（CNC）的共组装是一种很有前途的策略，可以制备具有先进应用的新型闪耀 CNC 材料。通过结合超声预处理和真空辅助自组装（VASA）技术，提出了一种简便、快速的策略，制备了具有多功能应用的 Mn 掺杂羧基化 CNC（C-CNC）闪耀薄膜。超声预处理暂时破坏了由于带负电荷的 C-CNC 与 Mn 之间的静电相互作用而导致的 C-CNC 纳米棒的聚集体。随后的 VASA 过程加速了手性液晶的自组装，同时 Mn 的桥接效应阻止了 C-CNC 的再团聚。此外，所制备的 Mn/CNC 薄膜在氨气氛中表现出快速且可见的颜色变化，同时形成 MnO。通过还原剂的刺激可以实现可逆变化。衍生的 MnO/C-CNC 复合薄膜通过吸附和降解过程在水溶液中对亚甲基蓝染料表现出高效的去除效果。
