Helical Structures Mimicking Chiral Seedpod Opening and Tendril Coiling

Area of Science:

• Materials Science
• Biomimetics
• Mechanical Engineering

Background:

• Helical structures are prevalent in nature and engineering, offering unique properties for applications like elastic springs and micropropulsion.
• Current methods for creating programmable helical structures lack a general principle for controlling geometry across different length scales.

Purpose of the Study:

• To review recent advancements in fabricating biomimetic 3D helical structures.
• To explore shape transformation mechanisms inspired by natural examples like Bauhinia variegata seedpods and plant tendrils.
• To categorize fabrication methods based on stimuli-responsive materials used.

Main Methods:

• Creating intrinsic curvatures in 2D rod-like or ribbon-like precursors.
• Utilizing functional materials such as hydrogels, liquid crystal elastomers, and shape memory polymers that exhibit differential responses to external stimuli.
• Reviewing and categorizing existing fabrication techniques.

Main Results:

• Significant breakthroughs in synthesizing 3D helical structures with programmable geometry.
• Demonstration of biomimetic helical structures inspired by natural coiling and chiral opening mechanisms.
• Fabrication methods are categorized by the specific stimuli-responsive materials employed.

Conclusions:

• The development of stimuli-responsive materials is key to fabricating tunable, biomimetic helical structures.
• Further interdisciplinary research in physics, engineering, and biology is crucial for advancing helical structure design and fabrication.
• This review provides insights and perspectives on the future development of helical structures.