基于非对称PVA/墨水/PE双层膜的光驱动柔性致动器和多功能传感器

Light-driven locomotive soft actuator and multi-functional sensors based on asymmetric PVA/carbon/PE bilayer film

聚乙烯醇/中国墨水混合物被均匀涂覆在聚乙烯薄膜上制备了结构稳定的双层软驱动器.由于两层材料的热膨胀系数的显著差异,在氙灯照射下,驱动器能以较快的响应速度实现较大的弯曲变形.通过改变光的强度以及结合尺蠖的仿生结构设计,机器人可以在不同的表面(如纸张和树叶)上实现各种形式的运动.同时在光的驱动下,它可以实现物体的捕获、表情的改变、象鼻的收缩与卷曲以及仿生花朵的开闭等.此外,基于双层驱动器良好的光热转换和灵敏的压力传感性能,它可以实现人体运动监测(如关节弯曲、呼吸、吞咽等),还能与光电转换装置集成.这种多功能、多驱动模式软机器人在可穿戴设备、交通运输、光电转换设备等应用领域具有巨大潜力.

Soft actuators and micro-robots receive significant attention for their potential applications in transportation,photovoltaic conversion devices,clinical care,and other fields.In this work,a polyvinyl alcohol/Chinese ink mixture was uniformly coated on polyethylene film for preparing structure-stabilized bilayer soft actuators.Due to the significant difference in thermal expansion coefficients between the two layers,the actuator can achieve a large bending deformation with a fast response speed under xenon light.A large amplitude of bending angle of 1260°was achieved in 6 s.A soft-body robot similar to an inchworm was constructed by changing the intensity of xenon or near-infrared light combined with the bionic structure design of an inchworm.The robot can realize various forms of movements(such as crawling and pushing boxes)on different surfaces(such as paper and leaves).Light-driven applications such as hands capable of grasping objects(grasping objects 14 times their weight),cats exhibiting variable expressions,elephant trunks performing curling and retraction,and bionic flowers realizing flowering and closing can be realized.In addition,based on the good photothermal conversion and pressure sensing performance of the bilayer actuator,it is able to monitor daily human activities(such as joint flexion,abdominal breathing,water swallowing,and other movements)and integrate with photoelectric conversion devices.This versatile and diverse drive-mode soft robot exhibits significant potential for applications such as wearable devices,transportation,photovoltaic conversion devices,and clinical therapies.