Research Center of Advanced Catalytic Materials & Functional Molecular Synthesis, Key Laboratory of Alternative Technologies for Fine Chemicals Process of Zhejiang Province, School of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
Research Center of Advanced Catalytic Materials & Functional Molecular Synthesis, Key Laboratory of Alternative Technologies for Fine Chemicals Process of Zhejiang Province, School of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
Int J Biol Macromol. 2024 Nov;279(Pt 4):135460. doi: 10.1016/j.ijbiomac.2024.135460. Epub 2024 Sep 10.
In this study, novel chitosan/polyethylene oxide/TiCT 2D MXene nanosheets (CS/PEO/TiCT) nanofibers were successfully prepared by a continuous electrospinning process. During the electrospinning process, induced by the syringe tip capillary effects and electric field force, the TiCT nanosheets were aligned along the direction of the nanofiber formation to occur a highly oriented structure. This well-ordered arrangement of the inorganic TiCT nanosheets within the organic polymer matrix nanofiber was similar with nacre-like 'brick-and-motar' structure to some extent, resulting in a marked increase in thermal stability and mechanical properties of the resultant CS/PEO/TiCT nanofiber. As 4 wt% of TiCT nanosheets loaded, the highest tensile strength of the CS/PEO/TiCT nanofiber mats was achieved as 31.7 MPa, about two times that of neat CS/PEO nanofibers. Uniformly dispersed Pd nanoparticles in size of about 1.6 nm have been successfully immobilized on the composite nanofiber with a solution impregnation process. With a loading as low as 0.2 mol% of Pd, the resultant Pd@CS/PEO/TiCT composite nanofiber catalysts were highly active for both Heck and Sonogashira coupling reactions with broad reactants application scope, and could be recycled 15 runs without significant loss of activities.
在这项研究中，通过连续静电纺丝工艺成功制备了新型壳聚糖/聚乙烯氧化物/TiCT 二维 MXene 纳米片（CS/PEO/TiCT）纳米纤维。在静电纺丝过程中，由于注射器尖端的毛细作用和电场力的作用，TiCT 纳米片沿纳米纤维形成的方向排列，发生高度取向结构。这种无机 TiCT 纳米片在有机聚合物基质纳米纤维内的有序排列在某种程度上类似于珍珠层状的“砖-泥”结构，导致所得 CS/PEO/TiCT 纳米纤维的热稳定性和力学性能显著提高。当负载 4wt%的 TiCT 纳米片时，CS/PEO/TiCT 纳米纤维垫的拉伸强度最高达到 31.7MPa，约为纯 CS/PEO 纳米纤维的两倍。通过浸渍法成功地将尺寸约为 1.6nm 的均匀分散的 Pd 纳米颗粒固定在复合纳米纤维上。在 Pd 负载量低至 0.2mol%的情况下，所得 Pd@CS/PEO/TiCT 复合纳米纤维催化剂对 Heck 和 Sonogashira 偶联反应均具有很高的活性，具有广泛的反应物应用范围，并且可以在没有明显失活的情况下循环使用 15 次。
