激光重编码形状可重构磁性机器人  

Shape⁃Reconfigurable Magnetic Robot with Laser Reprogramming

作　　者：张倩倩 李瑞 陶源 李家文 Zhang Qianqian;Li Rui;Tao Yuan;Li Jiawen(School of Engineering Science,University of Science and Technology of China,Hefei 230026,Anhui,China)

机构地区：[1]中国科学技术大学工程科学学院,安徽合肥230026

出　　处：《中国激光》2024年第23期34-42,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2021YFF0502700);国家自然科学基金(52075516);安徽省科技重大专项(202103a05020005)。

摘　　要：磁性机器人可以在磁场驱动下实现远程、快速和灵活的运动,而现有磁性机器人受限于固定的磁畴和柔软的基质,其变形能力和承载载荷有限,难以广泛应用于复杂环境。开发了一种磁畴可重编码的形状记忆复合材料,通过激光与磁场的协同作用,对形状记忆聚合物薄膜进行磁畴图案化重编码,制备出各种形态可重构、刚度可变的光磁响应机器人,有效解决了传统磁性机器人变形自由度有限以及承载能力较弱的难题。研究结果为开发执行复杂任务的自适应机器人提供了新的方法和思路。Objective Magnetic-responsive robots can achieve remote,rapid,and flexible motion under magnetic field actuation.However,existing magnetic robots are limited by fixed magnetic domains and soft matrices,which restricts their deformability and load-bearing capacity,thus limiting their widespread application in complex environments.In this study,a shape memory composite material is designed with reprogrammable magnetic domains.Through the synergistic action of laser and magnetic fields,the shape memory polymer film is patterned and re-encoded,resulting in various shape-reconfigurable and stiffness-variable opto-magnetic responsive robots.As a result,the limitations of traditional magnetic robots are overcome in terms of limited deformability and weak load-bearing capacity.Moreover,this work provides a new approach for developing adaptive robots capable of performing complex tasks.Methods The robot is constructed from reprogrammable shape memory composite(RM-SMC),integrating shape memory polymer(SMP)and embedded magnetic microcapsules.These microcapsules,composed of phase-change polymer ethyl vinyl acetate(EVA)encapsulating NdFeB magnetic particles,enable internal magnetic domain reprogramming within the RM-SMC film.Initially,the two-dimensional RM-SMC structure is magnetized in a 1.2 T magnetic field,aligning the magnetic domains along the film thickness direction.Upon near-infrared laser irradiation,the encapsulated NdFeB@EVA microcapsules rapidly absorb heat,causing the EVA to melt at its phase change temperature(90℃).This allows the magnetic particles to reorient along the external programming magnetic field(Bp),enabling internal magnetic particle re-encoding.Via subsequent global heating with low-power near-infrared laser,the RM-SMC temperature is increased to its glass transition temperature(Tg),transitioning it to an elastomer.Due to opposite magnetic domains in adjacent areas,the material deforms into a three-dimensional shape under a vertical actuation magnetic field(Ba),with folding deformation occurring

关 键 词：近红外激光 形状记忆薄膜 重编码 形状重构 磁性机器人 

分 类 号：TN249[电子电信—物理电子学]