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Silk Fibroin-Based Shape-Memory Organohydrogels with Semicrystalline Microinclusions.

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This study introduces novel organohydrogels (OHGs) using silk fibroin as a green emulsifier, creating high-strength, shape-memory materials with potential biomedical applications.

Keywords:
emulsionn-octadecyl acrylateorganohydrogelsself-emulsifiershape memorysilk fibroin

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Traditional emulsifiers can be toxic and environmentally harmful.
  • Silk fibroin (SF) is a natural protein with self-emulsifying properties.
  • Developing advanced hydrogels with tunable mechanical and shape-memory functions is crucial for various applications.

Purpose of the Study:

  • To design and synthesize novel organohydrogels (OHGs) using silk fibroin (SF) as a green emulsifier.
  • To create high-strength, shape-memory OHGs with enhanced mechanical properties and cytocompatibility.
  • To explore SF's potential as a sustainable alternative to chemical emulsifiers in emulsion-templated material synthesis.

Main Methods:

  • Fabrication of oil-in-water emulsions using SF as a self-emulsifier and n-octadecyl acrylate (C18A) monomer.
  • Stabilization of emulsions via ethanol-induced SF gelation (beta-sheet transition).
  • In situ UV-initiated polymerization of C18A droplets to form organogel phases within the SF hydrogel matrix.

Main Results:

  • Successfully synthesized stable oil-in-water emulsions and subsequent organohydrogels (OHGs) without external emulsifiers.
  • Achieved high-strength OHGs with a Young's modulus up to 4.3 MPa, compressive strength up to 2.5 MPa, and toughness up to 0.68 MPa.
  • Demonstrated switchable viscoelasticity and mechanics, along with good cytocompatibility and shape-memory function.

Conclusions:

  • Silk fibroin is a versatile and green self-emulsifier for creating complex emulsion-templated materials.
  • The developed organohydrogels exhibit superior mechanical properties and shape-memory capabilities.
  • These findings highlight the potential of SF-based organohydrogels for advanced applications in tissue engineering and soft robotics.