The liquid robot, an advanced form of the soft robot, can freely trans- form between different morphologies. From the perspective of mate- rials science, difficulty fabricating liquid functional materials hinders the development of liquid robots. Here, we report a paramagnetic- fluid-constructed liquid microrobot (1–1,000 mm) based on paramag- netic microdroplets. The paramagnetism not only allows the scaling down of the liquid robot to microscales but also renders the microro- bots reversible between paramagnetic-ferromagnetic transition upon magnetic field application. Furthermore, the paramagnetism equips these microrobots with on-board imaging and sensing abilities. The combined T1-T2 imaging modes cross-validated the real-time motion of the microrobots. The deformation degrees of these microrobots, which vary based on the structure of their surroundings, is measured by an ultra-low-field atomic magnetometer. The fabrication and char- acterization of these multifunctional paramagnetic liquid microrobots will lay the basis for their in vivo biomedical applications.

文章链接：https://www.cell.com/cell-reports-physical-science/fulltext/S2666-3864(23)00038-3