By auxiliary N-donor ligand-directed assembled, two entangled Co^II-coordination nets have been constructed from 3,3′,5,5′-azobenzenetetracarboxylic acid (H₄abtc), which present a rare 2D→3D polythreading motif constructed from 2-fold (6,3) polymeric layers with thickness being 10.2 Å and a 3-fold interpenetrating pillar-layered framework based on linear trinuclear Co^II-SBUs. In addition, two Co^II-complexes both show an antiferromagnetic coupling by long organic spacers and H₂O bridges, respectively.

Two unusual 4-connected Zn^II coordination networks have been successfully constructed from tetrahedral Zn^II and square-planar 3,3′,5,5′-azobenzenetetracarboxylate building units with the aid of comparable N-donor bridging spacers [1,3-bis(imidazol)propane and 1,3-bis(imidazol)butane], which direct the distinct 2-fold interpenetrating (6⁴·8²)(6⁶)₂ (bbf) structure with homochiral double-wall helical tubular motifs and the self-penetrating 8⁶ network, respectively.

A piezo‐actuated self‐lifting insect inspired flapping‐wing robot is presented. A novel method is presented in the work, which has taken into account the difficulties and the precision of assembly among micro components. Each component is properly designed and reasonably arranged to reduce the assembly difficulties of such insect‐scale robot. Specifically, the design of the piezoelectric actuator has taken into account the electrical isolation and assembly issues. The transmission and the airframe are integrated into one component to avoid assembly difficulties. Fibre directions of wing veins are reasonably arranged to possess high strength and stiffness. As a result, this robot, which weighs 84 mg with a wingspan of 35 mm, can generate sufficient thrust to take off with a flapping amplitude approximately ±60° under the resonant wingbeat frequency of 100 Hz.

A 165 mg coin‐size bionic water‐skating robot driven by piezoelectric (PZT) bending actuator is presented. The robot with light weight and elastic legs uses surface tension to keep itself on the water surface. The driving force produced by flapping wings enables it to glide easily due to tiny resistance coefficient of water surface. The robot consists of PZT bending actuator, four‐bar transmission structure, two flapping wings, four elastic legs and the body. The actuator bending at resonance frequency of 105 Hz achieves 346 μm displacement at the end of actuator at voltage of 280 V so that the flapping angle of the wings reaches 73° at that frequency. Tests show that, the maximum equivalent payload of robot is 830.6 mg, about five times of its own mass, before breaking the water surface, and the water drag when robot skates on the water surface is about 29 μN, 1.76% of its gravity. The maximum forward speed of the robot is measured as 151 mm/s.