纳米纤维素基底的Ti_(3)C_(2)T_(x)MXene复合膜的性能优化  

Properties optimization of Ti_(3)C_(2)T_(x)MXene composite film based on nanocellulose

作　　者：宁豪宇 向雯婷 李嘉宁 刘彩平 何坚[2] NING Haoyu;XIANG Wenting;LI Jianing;LIU Caiping;HE Jian(Pittsburgh Institute,Sichuan University,Chengdu 610065,China;College of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学匹兹堡学院,成都610065 [2]四川大学化学工程学院,成都610065

出　　处：《功能材料》2025年第3期3181-3187,3193,共8页Journal of Functional Materials

基　　金：四川省自然科学基金项目(2022NSFSC1190)。

摘　　要：Ti_(3)C_(2)T_(x)MXene柔性膜是由二维层状结构的金属碳/氮化物堆叠而成,具有优异的光热转化性能,但由于MXene片层之间以分子间相互作用组装而成,水分子存在易导致结合力降低,从而影响柔性膜的稳定性。针对MXene柔性膜稳定性问题,采用氟化锂+浓盐酸刻蚀,结合超声波剥离,加一定浓度的纳米纤维素(CNC),获得具有一定厚度、表面富含羟基及其它功能基团的Ti_(3)C_(2)T_(x)MXene纳米片。在此基础上,采用全氟癸基三甲氧基硅烷改性剂对薄膜进行表面化学修饰,获得以纤维素为骨架的疏水柔性膜材料。对得到的复合膜微观形态和表面官能团进行系统表征,再进行力学性能测试,明确掺加纤维素与疏水改性对薄膜的浸润性、光热性能、力学性能等性能的优化。结果显示,所制得的复合膜最大升温速率为115℃/min,与水接触角为129.8°,最大承受拉力提升率可达157.95%,光热、疏水以及力学性能表现良好。Ti_(3)C_(2)T_(x)MXene flexible film is composed of metallic carbon/nitride stacked with two-dimensional layered structure,exhibiting excellent photothermal conversion performance.However,due to the intermolecular interaction between the MXene layers,the presence of water molecules is easy to reduce the binding force,thus affecting the stability of the flexible film.To solve the stability problem of MXene flexible film,the Ti_(3)C_(2)T_(x)MXene nanosheets with a certain thickness and surface rich in hydroxyl and other functional groups were obtained by using lithium fluoride and concentrated hydrochloric acid etching,combined with ultrasonic peeling,and a certain concentration of nanocellulose(CNC).Subsequently,the surface of the film was chemically modified with perfluorodecyl trimethoxysilane modifier,and the hydrophobic flexible film material with cellulose as the skeleton was obtained.The microstructure and surface functional groups of the composite film were systematically characterized,and then the mechanical properties were tested to determine the optimization of infiltration,photothermal and mechanical properties of the film by adding cellulose and hydrophobic modification.The results show that the maximum heating rate of the prepared composite film is 115℃/min,the contact Angle with water is 129.8°,the maximum tensile lifting rate can reach 157.95%,showing good photothermal,hydrophobic and mechanical properties.

关 键 词：Ti_(3)C_(2)T_(x)MXene 纳米纤维素 光热转换 力学性能 复合膜 

分 类 号：TB333[一般工业技术—材料科学与工程]