Sustainable liquid metal-induced conductive nacre

Area of Science:

• Materials Science
• Nanotechnology
• Biomimetic Materials

Background:

• Nacre's hierarchical structure inspires the design of tough, high-performance composites.
• Developing eco-friendly and cost-effective nacre-mimetic materials is crucial for sustainable manufacturing.
• Existing methods face challenges in balancing mechanical strength, conductivity, and environmental impact.

Purpose of the Study:

• To develop a tough and conductive nacre-inspired composite using sustainable building blocks.
• To investigate the synergistic effects of liquid metal and sodium alginate as a "mortar" for aragonite platelets.
• To evaluate the mechanical properties, conductivity, and self-monitoring capabilities of the fabricated composite.

Main Methods:

• Exfoliation of aragonite platelets from natural nacre.
• Assembly of exfoliated platelets with liquid metal (gallium-based) and sodium alginate.
• Characterization of the composite's microstructure, mechanical performance (strength, toughness, impact resistance), and electrical conductivity.
• Assessment of self-monitoring capabilities for structural integrity.

Main Results:

• A conductive nacre-inspired composite was successfully fabricated with enhanced mechanical properties compared to natural nacre.
• The "mortar" of liquid metal and sodium alginate, forming GaOC coordination bonds, significantly improved compactness and reduced voids.
• The composite demonstrated excellent impact resistance due to synergistic strengthening and toughening mechanisms.
• Exceptional self-monitoring sensitivity was observed, indicating potential for structural health monitoring.

Conclusions:

• The proposed strategy offers a novel and sustainable approach to creating high-performance nacre-mimetic composites.
• Utilizing natural nacre components with liquid metal and sodium alginate presents a green pathway for advanced material development.
• The conductive nacre composite shows promise for applications requiring high toughness, conductivity, and self-monitoring functionalities.