Super Silk: Stronger and More Stable than Regular Silk

Topic: Materials Science

Researchers at Tohoku University created 'super silk' that maintains its shape even after getting wet. They did this by changing the diet of silkworms, which produces stronger and more stable fibers.

Silk has been valued for over 4,000 years as a luxury material. It's lightweight, strong, and biocompatible, making it useful for clothing, medical materials, and more.

However, regular silk has a weakness: it shrinks and loses its shape after repeated exposure to moisture. Researchers at Tohoku University wanted to solve this problem without changing the silk fibers themselves. Instead, they targeted an earlier step in the process by altering the diet of silkworms.

The research team added plant-derived cellulose nanofibers (CNFs) to silkworm feed. CNFs are tiny, strong fibers that help make the silk fibers stronger and more stable. The result was silk fibers with 50% greater tensile strength and reduced shrinkage after wetting and drying to less than one-quarter that of untreated silk.

These improvements were seen even when the silk fibers were processed into yarn and woven fabrics. This means that 'super silk' could be used effectively in final products, such as clothing or medical materials.

The researchers were excited to find that changing the silkworms' diet produced silk that is both stronger and more dimensionally stable in wet environments. They hope this sustainable approach will contribute to the development of next-generation functional textiles.

Why It Matters

This discovery could lead to the creation of new, high-performance materials for various industries, including medicine and fashion. It also shows how small changes during production can have a big impact on the final product's performance.

Key Facts

• Researchers at Tohoku University created 'super silk' that maintains its shape even after getting wet.
• The new silk fibers have 50% greater tensile strength and reduced shrinkage compared to untreated silk.
• The improvements were achieved by adding plant-derived cellulose nanofibers (CNFs) to silkworm feed.
• The researchers hope this sustainable approach will contribute to the development of next-generation functional textiles.
• The findings are published in the Journal of Industrial Textiles.

Key Terms

Cellulose Nanofibers

Tiny, strong fibers made from plant materials that help make silk fibers stronger and more stable.

Implications

This discovery could lead to the creation of new, high-performance materials for various industries, including medicine and fashion. It also shows how small changes during production can have a big impact on the final product's performance.