4D Printing of Reprogrammable Liquid Crystal Elastomers with Synergistic Photochromism and Photoactuation,Advanced Materials

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4D Printing of Reprogrammable Liquid Crystal Elastomers with Synergistic Photochromism and Photoactuation
Advanced Materials ( IF 27.4 ) Pub Date : 2023-07-11 , DOI: 10.1002/adma.202303969
Mei Chen _{1,

2} , Yanbei Hou _{1,

2} , Ran An _{1,

2} , H Jerry Qi ₃ , Kun Zhou _{1,

2}

Affiliation

4D printing of liquid crystal elastomers (LCEs) via direct ink writing has opened up great opportunities to create stimuli-responsive actuations for applications such as soft robotics. However, most 4D-printed LCEs are limited to thermal actuation and fixed shape morphing, posing a challenge for achieving multiple programmable functionalities and reprogrammability. Here, a 4D-printable photochromic titanium-based nanocrystal (TiNC)/LCE composite ink is developed, which enables the reprogrammable photochromism and photoactuation of a single 4D-printed architecture. The printed TiNC/LCE composite exhibits reversible color-switching between white and black in response to ultraviolet (UV) irradiation and oxygen exposure. Upon near-infrared (NIR) irradiation, the UV-irradiated region can undergo photothermal actuation, allowing for robust grasping and weightlifting. By precisely controlling the structural design and the light irradiation, the single 4D-printed TiNC/LCE object can be globally or locally programmed, erased, and reprogrammed to achieve desirable photocontrollable color patterns and 3D structure constructions, such as barcode patterns and origami- and kirigami-inspired structures. This work provides a novel concept for designing and engineering adaptive structures with unique and tunable multifunctionalities, which have potential applications in biomimetic soft robotics, smart construction engineering, camouflage, multilevel information storage, etc.

中文翻译：

具有协同光致变色和光驱动作用的可重编程液晶弹性体的 4D 打印

通过直接墨水书写的液晶弹性体 (LCE) 4D 打印为软机器人等应用创建刺激响应驱动提供了绝佳的机会。然而，大多数 4D 打印 LCE 仅限于热驱动和固定形状变形，这对实现多种可编程功能和可重编程性提出了挑战。这里开发了一种可 4D 打印的光致变色钛基纳米晶体 (TiNC)/LCE 复合墨水，可实现单个 4D 打印结构的可重新编程的光致变色和光致动。印刷的 TiNC/LCE 复合材料可响应紫外线 (UV) 照射和氧气暴露，在白色和黑色之间呈现可逆的颜色切换。在近红外 (NIR) 照射下，紫外线照射区域可以发生光热驱动，从而实现稳健的抓握和举重。通过精确控制结构设计和光照射，单个 4D 打印的 TiNC/LCE 物体可以进行全局或局部编程、擦除和重新编程，以实现理想的光控彩色图案和 3D 结构构造，例如条形码图案和折纸图案受剪纸启发的结构。这项工作为设计和工程具有独特和可调多功能的自适应结构提供了一种新颖的概念，在仿生软机器人、智能建筑工程、伪装、多级信息存储等方面具有潜在的应用。

更新日期：2023-07-11

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