Flax Composites With Improved Interfacial Strength Through Microbially Induced Mineral Precipitation

Area of Science:

• Materials Science
• Biomaterials Engineering
• Sustainable Composites

Background:

• Increasing demand for sustainable, lightweight materials in transportation and clean energy.
• Flax fiber composites offer carbon-capturing potential but suffer from poor mechanical performance due to hydrophilic nature and discontinuous architecture when embedded in hydrophobic matrices.
• Biomineralization strategies observed in nacre can inspire enhanced stress distribution and toughness in composites.

Purpose of the Study:

• To develop a biomineralization strategy for enhancing the mechanical performance of flax fiber composites.
• To introduce an additional hierarchical structure to flax composites inspired by natural materials.
• To investigate the effect of controlled mineral deposition on flax yarns.

Main Methods:

• A microbe-mediated biomineralization process was employed to deposit mineral particles onto flax yarns.
• Salt concentrations were tuned to control the mineral deposition process.
• Compressive toughness and strength of the modified flax composites were evaluated.

Main Results:

• Controlled biomineralization led to enhanced compressive toughness by 178% and compressive strength by 30%.
• The biomineralization strategy successfully introduced an additional hierarchy to the flax composites.
• The findings demonstrate improved stress transfer within the natural fiber composites.

Conclusions:

• Biomineralization offers a novel, bio-inspired pathway for tailoring the performance of natural fiber composites.
• This sustainable processing approach is scalable and environmentally friendly.
• The enhanced flax composites show promise for structural applications in modern transportation and clean energy sectors.