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Zhang Jinming from the Institute of Chemistry, Chinese Academy of Sciences, and Liu Qingtao from the Textile University reported a supramolecular co-assembly strategy for the preparation of Bolas-type polyethylene glycol peptide (BPP)/SF films. This strategy forms a strong payload co-assembly network through peptides and SF, in which polyethylene glycol (PEG) segments form supramolecular crosslinks. The obtained BPP/SF film has high stress (27.8 MPa), high toughness (3.64 M Jm−3), high transparency (89%), and high and medium infrared (MIR) emissivity (90.5%). This material performs well in passive radiative cooling and can effectively reduce the temperature of human arm skin and solar cells.
Researchers have tried to develop strategies to construct silk fibroin-based high-strength hydrogels (SF-HSHs). These hydrogels have a variety of uses in biomedicine and devices, but poor mechanical properties remain their main drawback. Through physical/non-covalent crosslinking mechanisms, researchers have developed a variety of SF-HSH examples, including physical crosslinking, double crosslinking, double network, and composite hydrogels.
A research team from Southeast University has developed a sensor based on rGO-silk fibroin hydrogel for human motion detection and gesture recognition. This hydrogel exhibits excellent stretchability and compressibility, and can be used as a strain sensor and pressure sensor. It has a wide sensing range from 100 Pa to 500 kPa, high sensitivity, and can distinguish pulse signals at different locations and changes before and after movement.
The team of Professor Chen Liang from the Department of Spine Surgery of the First Affiliated Hospital of Soochow University combined hydrogel technology with electrospinning technology to prepare elastic oriented hydrogel micro-nano fiber bundles with full bionic spinal cord performance, and achieve structural and functional repair of damaged spinal cord. This elastic oriented hydrogel micro-nano fiber bundle can significantly promote the directional distribution of stem cells and nerve cells, and promote the recovery of spinal cord function.
BPP/SF film can activate the breaking and recombination of hydrogen bonds in the β-folded crystal region through the addition and volatilization of formic acid, and achieve circulation and regeneration. The regenerated BPP/SF film can withstand objects that are 100,000 times heavier than its own weight, indicating that the film's regeneration effect is effective, and the mechanical robustness of the recycled BPP/SF film remains unchanged after multiple cycles of reprocessing and regeneration.
In the study of Professor Yu Dengguang of Shanghai University of Technology, it is mentioned that electrospinning technology is used to prepare functional medical sutures. This technology can be applied to silk protein materials to prepare sutures with good biocompatibility and mechanical properties to promote wound healing.
In the study of Zhang Ting's team at the Suzhou Institute of Nanotechnology, Chinese Academy of Sciences, it is mentioned that electrospun fiber flexible electronics have many application scenarios, including detection of human biophysical signals, biochemical signals, bioelectric signals, and as implantable bioelectronics to promote cell and tissue regeneration. This shows that electrospinning technology can be used to prepare silk protein-based flexible electronic devices, such as skin and implantable sensors.
In summary, through supramolecular co-assembly strategies, physical/non-covalent cross-linking mechanisms, and combined with electrospinning technology, researchers have developed silk fibroin-based materials with high mechanical properties and recyclability, which show great application potential in the field of flexible and wearable devices.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1002/adfm.202402999
