Fig. 2: Molding-integrated DLW and micro-rotor array for fabricating programmable micro-actuators. | Nature Communications

Fig. 2: Molding-integrated DLW and micro-rotor array for fabricating programmable micro-actuators.

From: Creating three-dimensional magnetic functional microdevices via molding-integrated direct laser writing

Fig. 2

a The fabrication process of the micro-rotors. b Schematic showing a single micro-rotor. The white arrow marks the magnetic moment (m) direction of the rotor ring. The angle between m and the propeller is marked as \(\varphi\). c The arrangement of the propeller orientations in the 8 by 8 micro-rotor array. Neighboring micro-rotors have a phase difference of \(\pi\)/4. d Video (Supplementary Movie 2) frames of the array immersed in water under an in-plane rotating magnetic field. The field is 15 mT and rotates at a frequency of 0.8 Hz. Color code marks the micro-rotors of a certain rotational phase; for example, red denotes a phase of \(\pi\)/2 and purple does \(\pi\). e Video (Supplementary Movie 3) frames of the fluidic experiment with the array immersed in water. 2 µm polystyrene beads water suspension is injected at the left bottom corner. The white dashed line marks the contour of the traveling beads. The magnetic field is 40 mT and rotates at a frequency of 5.8 Hz.

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