The ability of controlled pitch variation can give more forms of motion to the micro-rotor. By combining the photothermal conversion material CNTs with temperature-sensitive hydrogel material, the hydrogel can be driven by light to produce a recoverable and controlled deformation, which is verified by the swimming of a bionic jellyfish. Furthermore, we innovatively apply the variable pitch form of helicopters to the motion of micro-propellers. The magnetic field is used to power the rotation of the micro-rotor robot, and the light illumination provides the pitch variation capability to facilitate the manipulation of the motion behavior of the micro-rotor robot. Driven by a magnetic and optical coupling field, the ascending and descending of micro-propellers carrying objects are achieved. Our design provides a novel idea for the control strategy of micro-robots.
A facile strategy was developed to fabricate structure controllable microcrystals of ferrocene-based metal–organic (Fc-Ala-BCB) materials through evaporation-induced self-assembly. Two distinctive microcrystals, microrods and microtubes had been achieved by tuning the solvents during the self-assemblies. X-ray diffraction analysis was conducted on single crystals to investigate the packing mode of Fc-Ala-BCB molecules, which indicated the two crystals with the hexagonal system. Inheriting the aromaticity and chirality of ferrocenyl and l-Ala, this organic molecule self-assembled into a single-helix structure through intermolecule hydrogen bonds and π–π stacking. Theoretical analysis and stimulated computations were carried out to compare the surface energies of certain planes. Among those microcrystals, the microrods exhibited a higher chemical activity in catalyzing the decomposition of H2O2, due to the high-density atomic steps and kinks on the high energy surfaces. However, the hollow hexagonal tubes displayed appropriate catalytic activity and novel maneuverability toward catalyzing H2O2. The O2 bubbles accumulated at the inner walls of the microtube were periodically released as individual bubbles, suggesting their potential application as a new kind of microengine (e.g., the microrotor).
危险品化学品经营许可证（带存储）