Rotational Self-Assembly of Hydrogel Microstructures via Induced Asymmetric Capillary Dynamics.

Area of Science:

• Materials Science
• Nanotechnology
• Mechanical Engineering

Background:

• Capillary force drives micro/nanostructure self-assembly.
• Existing research focuses on vertical/horizontal motion, neglecting in-plane rotation.
• Systematic exploration of constrained in-plane rotational motion is limited.

Purpose of the Study:

• To propose and validate an in-plane rotation model for microstructures using capillary force self-assembly (CFSA).
• To achieve controllable and directional in-plane rotational motion.
• To explore the manipulation of chiral self-assembly through controlled rotation.

Main Methods:

• Fabrication of rotational microstructures via femtosecond laser direct writing.
• Introduction of an initial deflection angle to create asymmetric capillary force distribution.
• Utilizing liquid evaporation to drive rotation based on driving force and structural resistance.

Main Results:

• Demonstrated controllable and large-angle in-plane rotation of microstructures.
• Successfully fabricated anisotropic microstructures with tunable cross-linking density.
• Showcased deterministic guiding of rotation direction via hydration differences.

Conclusions:

• The proposed CFSA model enables precise control over microstructural in-plane rotation.
• Tunable anisotropic structures facilitate regulation of rotational behavior and chiral assembly.
• This method offers new possibilities for designing complex micro/nanostructured architectures.