Transparent and tough bulk composites inspired by nacre

Area of Science:

• Materials Science
• Biomimetics
• Glass Science

Background:

• Traditional oxide-based glasses lack mechanical strength and crack tolerance, limiting their use in demanding applications like electronic displays and structural windows.
• Achieving both optical transparency and high mechanical strength in materials remains a significant challenge.

Purpose of the Study:

• To develop novel transparent materials with enhanced mechanical properties, specifically improved fracture toughness and hardness.
• To investigate the potential of biomimetic design, inspired by nacre, for creating advanced glass-based composites.

Main Methods:

• Fabrication of bulk transparent materials using a simple approach to create a nacre-like architecture.
• Mechanical characterization, including fracture toughness, flexural strength, and hardness testing, of the synthesized glass composites.

Main Results:

• The fabricated glass composites exhibit a nacre-like architecture capable of arresting crack propagation.
• Fracture toughness was improved by up to a factor of 3 compared to common glasses.
• Flexural strengths were comparable to transparent polymers and common glasses, while hardness was an order of magnitude higher than transparent polymers.

Conclusions:

• Implementing biological design principles at the microscale enables the creation of glass-based composites with superior mechanical properties.
• This approach offers a promising new pathway for manufacturing structural materials with combined optical transparency and enhanced mechanical performance, addressing limitations of current transparent materials.