摘要
为赋予液晶弹性体(LCE)多重刺激响应特性以提高其在柔性机器人领域的应用潜力,本文基于界面聚合策略制备了一种具有光化学-光热-磁三重刺激响应的双层纳米复合LCE。通过在尚未聚合完全的偶氮苯LCE基底上均匀喷涂八乙烯基笼型聚倍半硅氧烷修饰的四氧化三铁纳米颗粒(POSS@Fe_(3)O_(4)NPs)层,诱导聚合物基底表面游离的丙烯酸酯基与磁性纳米层表面的乙烯基发生自由基聚合反应,制备了有机-无机界面紧密连接的POSS@Fe_(3)O_(4)NPs-LCE复合材料(PFe-LCE)。得益于偶氮苯液晶基元的紫外光异构化及POSS@Fe_(3)O_(4)NPs的光热转化性能,该复合材料能够在紫外光照射下2 s内产生200°弯曲变形并在红外光的照射下7.5 s内恢复初始形态,而使用可见光照射50 s仅能恢复83%的形状。此外,该材料还能在磁场的作用下发生偏转,具备磁响应性能。以PFe-LCE为原料,设计了一种四爪型搬运机器人,该机器人在复杂的环境下能够通过光-磁协同驱动实现对货物的抓取-运输-投放操作,展现出了优异的环境适应性,为探索软体机器人的智能驱动提供了一种新策略。
In order to endow liquid crystal elastomers(LCE)with multiple-stimuli-responsiveness and enhance their potential application in flexible robotics,we developed an interfacial polymerization strategy to fabricate a bilayer nanocomposite LCE with photochemical,photothermal,and magnetic responsiveness.The Fe_(3)O_(4)nanoparticles coated with octa-vinyl polyhedral oligomeric silsesquioxane(POSS@Fe_(3)O_(4)NPs)were sprayed onto the surface of partially polymerized azobenzene LCE,and then induced the free radical polymerization between the unreacted acrylic-ester groups in the polymeric matrix and the abundant vinyl on the magnetic nanomaterials layer,to yield a POSS@Fe_(3)O_(4)NPs-LCE composite(PFe-LCEs)with a tightly-integrated organic-inorganic interface.With merits of the UV-induced isomerization of azobenzene mesogens and the photothermal conversion capability of POSS@Fe_(3)O_(4)NPs,the composite elastomer could generate a 200°bending in 2 s under UV irradiation and returned to its initial state within 7.5 s under infrared light exposure.In contrast,utilizing visible light irradiation for 50 s can only restore 83%of the original shape.Additionally,this material exhibits magnetic responsiveness,allowing it to deflect under an applied magnetic field.The PFe-LCE was used to fabricate a quadrupedal transport robot capable of grasping,transporting,and releasing cargo through light-magnetic synergistic actuation in a complex environment.The demonstrated environmental adaptability highlighted a novel strategy for intelligent actuation in soft robotics.
作者
蔡雨洁
从怀萍
CAI Yujie;CONG Huaiping(College of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《液晶与显示》
北大核心
2025年第6期836-845,共10页
Chinese Journal of Liquid Crystals and Displays
基金
国家自然科学基金(No.22171066)。
关键词
液晶弹性体
多重刺激响应
界面聚合
双层结构
柔性机器人
liquid crystal elastomers
multiple-stimulus-responsiveness
interfacial polymerization
bilayer structure
soft robots
作者简介
蔡雨洁,女,硕士研究生,2022年于太原工业学院获得学士学位,主要从事光驱动柔性材料的研究。E-mail:15257134496@163.com;通信联系人:从怀萍,女,博士,教授,2009年于中国科学技术大学获得博士学位,主要从事微纳结构柔性复合材料的设计、制备及其器件应用的研究。E-mail:hpcong@hfut.edu.cn。
