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Area of Science:

  • Materials Science
  • Biotechnology
  • Polymer Science

Background:

  • Nature utilizes simple components for advanced functional materials, exemplified by spider silk's toughness and cellulose's strength.
  • Obtaining sufficient spider silk is challenging due to limited spider resources and high costs of recombinant production.
  • Cellulose nanofibrils (CNFs) are abundant, strong, and stiff natural materials derived from wood.

Purpose of the Study:

  • To develop novel bio-based composite materials by combining recombinant spider silk proteins with cellulose nanofibrils (CNFs).
  • To fabricate both isotropic and anisotropic hierarchical structures with enhanced mechanical properties and biofunctionalities.
  • To explore sustainable alternatives to fossil-based resources in material design.

Main Methods:

  • Functionalized recombinant spider silk proteins were combined with cellulose nanofibrils (CNFs).
  • Fabrication of isotropic and anisotropic hierarchical structures, including bio-based fibers.
  • Mechanical testing to evaluate stiffness, strength at break, and toughness.

Main Results:

  • Anisotropic bio-based fibers achieved unprecedented mechanical performance: ~55 GPa stiffness, ~1015 MPa strength at break, and ~55 MJ m-3 toughness.
  • Addition of silk fusion proteins to CNFs imparted advanced biofunctionalities not present in CNFs alone.
  • Demonstrated successful fabrication of hierarchical structures with tunable properties.

Conclusions:

  • Combining spider silk proteins with CNFs offers a viable strategy for creating high-performance, bio-based composites.
  • This approach yields materials with superior mechanical properties and novel biofunctionalities.
  • The developed bio-based materials present a sustainable alternative to fossil-based resources, reducing environmental impact.