Push, Push, Push – Cooperative Actuators and Actuators Fields by Direct Writing Pro-cesses

推，推，推 â 协作执行器和直接写入过程的执行器字段

• 批准号: 424615605
• 负责人: Professor Dr. Jürgen Rühe
• 金额: --
• 依托单位: Institut für Mikrosystemtechnik (IMTEK)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/424615605?language=en
• 关键词: Push; Cooperative; Actuators; Fields; Direct

Two-photon crosslinking (2PC) based on C,H insertion reactions allows the generation of microactuators from magnetic composites by a maskless direct writing process. To this copolymers are employed in which 2-photon chromophores such as suitably substituted anthraquinone groups are incorporated and which are cross-linked with the aid of 2-photon processes. This cross-linking process takes place in the glass-like state of the polymers. After completion of the writing process, all non-crosslinked polymer molecules are washed out to develop the microstructures. If nanoparticles have been mixed into the prepolymers before the deposition of the layer, three-dimensional microstructured nanocomposites can be obtained directly in a one-step process. Thus, with the help of such a maskless writing process, magnetically actuatable microstructures in almost any form can be written three-dimensionally which are self-supporting. In the proposed project, cooperative magnetically actuatable structures such as ciliated surfaces for micromixers or micropumps or actuator fields which show metachronal waves will be generated. By variation of the written structures, actuator fields with designed properties or actuators, which can act cooperatively can be generated. Larger structures can be generated by molding with the same polymers, but by a conventional photochemical process and/or 3D printing.Furthermore, it will be investigated to what extent microactors can be generated by writing network structures in multilayers in which the actuators react to different stimuli. For this purpose multilayered systems are generated from different materials and after drying they are cross-linked in a glass-like state by means of the two-photon process, so that the individual structural components are covalently linked to each other. In this way, actuators are obtained in which parts of the structures can be influenced either gradually or switched on/off by an external stimulus, for example light or moisture. Thus, microactuators can be generated that allow intrinsic sensing and an autonomous response to changes in the environment. If these multi-responsive actuators are skillfully combined, a multi-stage actuator system should be achievable in which the respective stage is reached by an external stimulus. On the other hand, looking at actuator fields the individual parts of the cilia fields could be switched on and off by the external stimulus, so that novel cooperative phenomena can be investigated.The proposed project will also investigate how bi- and multistable structures can be generated using the newly developed method. For bi-stable structures, actuators have to be designed where the system can be switched from one stable state to another by a simple "snap through" mechanism or showing other buckling instabilities.

基于 C、H 插入反应的双光子交联 (2PC) 允许通过无掩模直写工艺从磁性复合材料生成微执行器。对于该共聚物，使用其中掺入2-光子发色团例如适当取代的蒽醌基团并且借助2-光子过程交联的共聚物。这种交联过程发生在聚合物的玻璃态下。写入过程完成后，所有非交联的聚合物分子都被洗掉以形成微结构。如果在沉积层之前将纳米颗粒混合到预聚物中，则可以通过一步过程直接获得三维微结构纳米复合材料。因此，借助这种无掩模写入工艺，几乎任何形式的磁致动微结构都可以进行自支撑的三维写入。在拟议的项目中，将产生协同磁致动结构，例如用于微混合器或微泵的纤毛表面或显示异时波的致动器场。通过改变书面结构，可以生成具有设计属性的致动器场或可以协同作用的致动器。可以通过使用相同的聚合物模制，但通过传统的光化学工艺和/或 3D 打印来生成更大的结构。此外，还将研究通过在多层中写入网络结构（其中执行器对不同的刺激做出反应）可以在多大程度上生成微演员。为此，多层系统由不同的材料生成，干燥后，它们通过双光子过程以玻璃态交联，从而使各个结构组分彼此共价连接。通过这种方式，获得了致动器，其中部分结构可以逐渐受到外部刺激（例如光或湿气）的影响或打开/关闭。因此，可以生成允许固有传感和对环境变化做出自主响应的微致动器。如果将这些多响应执行器巧妙地组合起来，应该可以实现多级执行器系统，其中通过外部刺激达到各个阶段。另一方面，观察致动器场，纤毛场的各个部分可以通过外部刺激打开和关闭，从而可以研究新的合作现象。该项目还将研究如何使用新开发的方法生成双稳态和多稳态结构。对于双稳态结构，执行器的设计必须使系统可以通过简单的“快速切换”机制从一种稳定状态切换到另一种稳定状态或显示其他屈曲不稳定性。