Small-scale actuators and propellers have benefited from advances in materials and manufacturing to become more lifelike. Inspired by animal species, multi-generational chemically powered artificial propellers that carry small versions of themselves and deliver them "on-the-fly" are described. The released replicas are capable of autonomous propulsion and propelling immediately after detachment. Release occurs without human involvement and relies solely on sacrificial layers separating the carriers and replicas. These layers are composed of transient natural polymers, which dissolve under the swimming conditions to release the confined replicas. Judicious selection of the responsive transient materials, layer thickness, and solution conditions (e.g., pH), leads to programmable delivery of the replicas. Finally, the ability of the same carrier propellers to carry and transport multiple generations of propellers and deliver them at predetermined times is demonstrated.

中文翻译：

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小型螺旋桨可提供微型版本。

小型执行器和螺旋桨得益于材料和制造方面的进步，变得更加栩栩如生。受动物物种的启发，描述了多代化学动力人工螺旋桨，这些螺旋桨自身携带小型版本并“即时”交付。释放的复制品能够在分离后立即自动推进和推进。释放是在没有人类参与的情况下发生的，并且仅依靠分隔载体和复制品的牺牲层。这些层由瞬时天然聚合物组成，它们在游泳条件下溶解以释放受限的复制品。对响应性瞬态材料，层厚和溶液条件（例如pH）的明智选择会导致复制品的可编程交付。最后，