Dr. Hang Zhang Profile

Dr. Hang Zhang

at Aalto Univ

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Proceedings Article | 9 June 2023 Paper

Feedbacks in light-active soft materials

Jianfeng Yang, Haotian Pi, Hang Zhang, Hao Zeng

Proceedings Volume 12584, 125840D (2023) https://doi.org/10.1117/12.2665325

KEYWORDS: Polymeric actuators, Polymers, Light absorption, Negative feedback, Liquid crystals, Positive feedback, Actuators, Robotics

Read Abstract +

Imitating the self-regulated motions of natural species allows for novel applications in inanimate material systems. These applications include autonomous robotic systems, adaptive devices, and auto-energy harvesting. However, significant challenges exist in accurately controlling stimulus-induced deformations and establishing a reliable relationship between external energy fields and material deformations. In this study, we demonstrate that a simple light-triggered bending actuation in smart material systems based on liquid crystal elastomers is influenced by an opto-mechano-optical feedback mechanism. The pre-curved geometry enables enhance of light absorption upon photothermally induced deformation (from bent to flat), followed by a reduce of energy absorption upon further deformation (from flattening to bending toward the light). This strong nonlinearity in stimulus-induced deformability is governed by positive and negative feedback, and we experimentally verified these mechanisms using a thermal camera. Our results reveal the ubiquitous feedback nature of most light-active polymer systems.

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