Progress in Bioinspired Dry and Wet Gradient Materials from Design Principles to Engineering Applications

Area of Science:

• Bio-inspired materials science
• Materials engineering
• Biomimetics

Background:

• Organisms evolve complex, hierarchical, and anisotropic structures for survival.
• Natural materials often exhibit heterogeneity and functional gradient distributions.
• Understanding gradient designs in nature can drive innovation in high-performance materials.

Purpose of the Study:

• Review design principles of gradient biological materials.
• Highlight examples of natural gradient structures.
• Explore biomimetic fabrication and applications.

Main Methods:

• Review of existing literature on gradient biological materials.
• Analysis of natural structure symmetries (point, axial, mirror, 3D).
• Demonstration of fabrication techniques for biomimetic counterparts.

Main Results:

• Identified convergent and divergent gradient designs in nature.
• Showcased biomimetic prototypes with enhanced properties.
• Summarized applications in robotics, biomedical, energy, and environmental fields.

Conclusions:

• Nature's gradient designs offer a paradigm for next-generation materials.
• Biomimetic approaches can yield superior material performance.
• Functional gradient materials have broad future applications.