3D‐Printed Photoresponsive Liquid Crystal Elastomer Composites for Free‐Form Actuation
3D‐Printed Photoresponsive Liquid Crystal Elastomer Composites for Free‐Form Actuation
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DOI：
10.1002/adfm.202210614
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发表时间：
2022-11
影响因子：
19
通讯作者：
Yuchen Wang;Rui Yin;Lishuai Jin;Mingzhu Liu;Yuchong Gao;J. Raney;Shu Yang
中科院分区：
文献类型：
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作者：
Yuchen Wang;Rui Yin;Lishuai Jin;Mingzhu Liu;Yuchong Gao;J. Raney;Shu Yang
液晶弹性体(LCE)的直接墨水写入提供了一种新的机会，可以针对各种形状转换模式对几何图形进行编程，从而实现软机器人等应用。到目前为止，大多数3D打印的LCE都是热驱动的。在此，开发了一种3D可打印的光响应金纳米棒(AuNR)/LCE复合油墨，允许对3D打印结构进行光热驱动，AuNR低至0.1wt.%。结果表明，在最佳的印刷条件下，在1.4W cm−2(相当于160°C)的近红外光(80 8 Nm)照射下，印刷灯丝具有良好的光热响应，其致动应变为2 7%。通过控制暴露在近红外激光下的区域，3D打印的复合结构可以全局或局部地驱动成不同的形状。利用3D打印实现的定制结构和局部曝光控制能力，展示了一种光响应型软机器人，它可以在棘轮表面上爬升，最大速度分别为0.284 mm S−1(在平坦表面上)和0.216 mm S−1(在30°倾斜表面上)，分别相当于每分钟0.428和0.324体长，具有大的体质量(0.23g)和大的厚度(1 Mm)。
Direct ink writing of liquid crystal elastomers (LCEs) offers a new opportunity to program geometries for a wide variety of shape transformation modes toward applications such as soft robotics. So far, most 3D‐printed LCEs are thermally actuated. Herein, a 3D‐printable photoresponsive gold nanorod (AuNR)/LCE composite ink is developed, allowing for photothermal actuation of the 3D‐printed structures with AuNR as low as 0.1 wt.%. It is shown that the printed filament has a superior photothermal response with 27% actuation strain upon irradiation to near‐infrared (NIR) light (808 nm) at 1.4 W cm−2 (corresponding to 160 °C) under optimal printing conditions. The 3D‐printed composite structures can be globally or locally actuated into different shapes by controlling the area exposed to the NIR laser. Taking advantage of the customized structures enabled by 3D printing and the ability to control locally exposed light, a light‐responsive soft robot is demonstrated that can climb on a ratchet surface with a maximum speed of 0.284 mm s−1 (on a flat surface) and 0.216 mm s−1 (on a 30° titled surface), respectively, corresponding to 0.428 and 0.324 body length per min, respectively, with a large body mass (0.23 g) and thickness (1 mm).