Light-Driven Multidirectional Bending in Artificial Muscles,Advanced Materials

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Light-Driven Multidirectional Bending in Artificial Muscles
Advanced Materials ( IF 27.4 ) Pub Date : 2024-07-23 , DOI: 10.1002/adma.202405917
Zahra Madani ₁ , Pedro E S Silva ₁ , Hossein Baniasadi ₂ , Maija Vaara ₁ , Susobhan Das ₃ , Juan Camilo Arias ₃ , Jukka Seppälä ₂ , Zhipei Sun ₃ , Jaana Vapaavuori ₁

Affiliation

Using light to drive polymer actuators can enable spatially selective complex motions, offering a wealth of opportunities for wireless control of soft robotics and active textiles. Here, the integration of photothermal components is reported into shape memory polymer actuators. The fabricated twist-coiled artificial muscles show on-command multidirectional bending, which can be controlled by both the illumination intensity, as well as the chirality, of the prepared artificial muscles. Importantly, the direction in which these artificial muscles bend does not depend on intrinsic material characteristics. Instead, this directionality is achieved by localized untwisting of the actuator, driven by selective irradiation. The reaction times of this bending system are significantly – at least two orders of magnitude – faster than heliotropic biological systems, with a response time up to one second. The programmability of the artificial muscles is further demonstrated for selective, reversible, and sustained actuation when integrated in butterfly-shaped textiles, along with the capacity to autonomously orient toward a light source. This functionality is maintained even on a rotating platform, with angular velocities of 6°/s, independent of the rotation direction. These attributes collectively represent a breakthrough in the field of artificial muscles, intended to adaptive shape-changing soft systems and biomimetic technologies.

中文翻译：

人造肌肉中的光驱动多向弯曲

使用光驱动聚合物执行器可以实现空间选择性的复杂运动，为软机器人和活性纺织品的无线控制提供大量机会。在这里，光热组件被集成到形状记忆聚合物致动器中。制造的扭转线圈人造肌肉显示出指令性的多向弯曲，这可以通过所制备的人造肌肉的照明强度和手性来控制。重要的是，这些人造肌肉弯曲的方向并不取决于内在的材料特性。相反，这种方向性是通过选择性照射驱动的致动器的局部解扭来实现的。这种弯曲系统的反应时间比向日光生物系统快至少两个数量级，响应时间可达一秒。当集成到蝴蝶形纺织品中时，进一步证明了人造肌肉的可编程性，可实现选择性、可逆和持续致动，以及自主朝向光源的能力。即使在角速度为 6°/s 的旋转平台上，该功能也能保持，与旋转方向无关。这些属性共同代表了人造肌肉领域的突破，旨在实现自适应形状变化的软系统和仿生技术。

更新日期：2024-07-23

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