Buckling and twisting of advanced materials into morphable 3D mesostructures

Area of Science:

• Materials Science
• Mechanical Engineering
• Nanotechnology

Background:

• Mechanically guided assembly enables the creation of complex 3D structures from 2D precursors using stress relaxation in elastomeric platforms.
• Current methods are limited in generating specific geometric features like local chirality.

Purpose of the Study:

• To introduce a novel scheme for incorporating local twisting deformations into mechanically guided assembly.
• To expand the range of accessible 3D mesostructures with enhanced geometric complexity and chirality.

Main Methods:

• Utilizing segmented elastomeric assembly platforms with interconnected, rotatable units.
• Generating in-plane torques through engineered bonding sites on 2D precursors during stress relaxation.
• Applying finite-element analysis and electromagnetic modeling for design and validation.

Main Results:

• Demonstrated a new method for introducing local twisting deformations in 3D mesostructure fabrication.
• Successfully created diverse 3D structures with local chirality and previously inaccessible geometrical features.
• Developed a mechanically tunable, multilayered chiral 3D metamaterial for terahertz applications.

Conclusions:

• The proposed scheme significantly enhances the capabilities of mechanically guided assembly for creating complex chiral 3D materials.
• This approach opens new avenues for designing advanced functional materials with tailored properties.
• The demonstrated terahertz metamaterial highlights the practical applicability of this fabrication technique.