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High-Strength, Durable All-Silk Fibroin Hydrogels with Versatile Processability toward Multifunctional Applications
Zhenghua Zhu1, Shengjie Ling2, Jingjie Yeo3
1Department of Applied Engineering, Zhejiang Institute of Economic and Trade, Hangzhou, Zhejiang Province, 310018, China; Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA.
Advanced Functional Materials
|May 23, 2020
Summary
Researchers developed strong silk fibroin (SF) hydrogels using a novel binary solvent induced conformation transition (BSICT) method. These advanced SF hydrogels offer superior mechanical properties for diverse applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Polymer Chemistry
Background:
- Hydrogels are widely researched for biomedical, pharmaceutical, biosensor, and cosmetic applications.
- The limited mechanical strength of conventional hydrogels restricts their practical utility.
- Silk fibroin (SF) is a promising biopolymer with potential for hydrogel development.
Purpose of the Study:
- To develop silk fibroin (SF) hydrogels with significantly enhanced mechanical properties.
- To investigate a novel method for creating robust hydrogel networks without complex chemical treatments.
- To explore the processability and potential applications of these advanced hydrogels.
Main Methods:
- A binary solvent induced conformation transition (BSICT) strategy was employed to induce conformational changes in SF.
- Moderate binary solvent diffusion and SF/solvent interactions regulated the conformational transition.
- Physical crosslinking via beta-sheet formation created a 3D hydrogel network.
Main Results:
- Pristine SF hydrogels with excellent mechanical properties were successfully generated.
- The Young's modulus of BSICT-SF hydrogels reached up to 6.5±0.2 MPa, significantly exceeding conventional hydrogels.
- These hydrogels demonstrated versatility in processing, enabling molding, laser cutting, and machining.
Conclusions:
- The BSICT strategy provides an effective route to produce mechanically robust SF hydrogels.
- These advanced hydrogels fill a critical gap in soft material properties, offering superior performance.
- The processability and mechanical strength suggest broad potential in biomedical and engineering fields.
