期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 17, 页码 14765-14774出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02713
关键词
regenerated silk fibroin; cellulose nanofibers; dry-spinning; microfluidic chip; mechanical properties
资金
- National Key Research and Development Program of China [2016YFA0201702/2016YFA0201700, 2018YFC1105802/2018YFC1105800]
- Fundamental Research Funds for the Central Universities [2232019A3-06, 2232019D3-02]
- National Natural Science Foundation of China [21674018]
- Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low dimension Materials [18520750400]
- Programme of Introducing Talents of Discipline to Universities [111-2-04]
- National Science Foundation in the U.S. [DMR-1808690]
As spider silks have extraordinary mechanical properties, the design of high-performance artificial silk fibers has been one of the focuses in the field of biomimetic fibers. Cellulose nanofibers (CNFs) have considerable potential being an effective reinforcing agent in biocompatible composites because of their high aspect ratio, good stiffness of the crystalline regions, and biocompatibility. In this study, regenerated silk fibroin (RSF)/CNF hybrid fibers were dry spun through a microfluidic chip, which mimicked the shape of spider's major ampullate gland. The results showed that the presence of CNF can substantially enhance the mechanical properties of RSF. In specific, the breaking strength of the RSF/CNF fibers with 0.1 wt % CNF was increased to 486 +/- 106 MPa with a maximum value of 686 MPa, significantly higher than that of silk fibers from silkworm. The enhancement could be attributed to higher orientation of crystalline and mesophase contents, higher crystallinity, and hydrogen bonds linked between RSF and CNF. This study outlined a simple and environmentally friendly pathway to generate artificial silks with high-performance properties.
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