Three-Dimensional Printing of Liquid Crystals with Thermal Sensing Capability via Multimaterial Vat Photopolymerization
Three-Dimensional Printing of Liquid Crystals with Thermal Sensing Capability via Multimaterial Vat Photopolymerization
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DOI：
10.1021/acsapm.2c00322
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发表时间：
2022-04-08
影响因子：
5
通讯作者：
Li, Xiangjia
中科院分区：
文献类型：
--
作者：
Joralmon, Dylan;Alfarhan, Saleh;Li, Xiangjia
自然界的生物拥有独特的智能材料系统，可以通过进化的自我负责的架构来感知环境变化。例如，Japetella heathi 章鱼表现出一种非凡的能力，可以改变自己的外观来逃避捕食者的注意。在这里，我们提出了一种通过多材料三维（3D）打印生产具有热传感架构的 Japetella heathi 智能材料的方法，其中传统的丙烯酸基紫外线树脂和反应性液晶（LC）经过光固化形成具有所需图案的物体。独特热力学相（例如向列相和各向同性相）中液晶的取向和位置顺序水平可以通过材料的局部温度进行调节。因此，3D 打印液晶材料（在打印的多材料物体内）具有独特的光学特性，可以响应外部热刺激从不透明（向列相）可逆地转变为透明（各向同性相）。多材料 3D 打印工艺提供了一种多功能制造工具，能够设计和制造具有复杂 3D 形状的仿生智能材料，适用于各种潜在应用，例如软机器人、柔性传感器和智能防伪设备。
Creatures in nature possess unique smart material systems that can sense environmental changes with evolved selfresponsible architectures. For example, the Japetella heathi octopus exhibits a remarkable ability to change its appearance to evade the attention of predators. Here, we present an approach to produce Japetella heathi-inspired smart materials with thermal sensing architectures by multimaterial three-dimensional (3D) printing, where both conventional acrylic-based ultraviolet resins and reactive liquid crystals (LCs) are photocured to form an object with desired patterns. The levels of orientational and positional orders of LCs in unique thermodynamic phases (e.g., nematic and isotropic phases) can be modulated by the local temperature of the material. As a result, the 3D printed liquid crystalline materials (within the printed multimaterial object) possess a unique optical property that can reversibly transition from opaque (in the nematic phase) to transparent (in the isotropic phase) in response to external thermal stimuli. The multimaterial 3D printing process provides a versatile manufacturing tool that enables the design and fabrication of bioinspired smart materials with complex 3D shapes for various potential applications, such as soft robots, flexible sensors, and smart anticounterfeiting devices.