Inspired by the natural spinning process, we developed an aqueous wet spinning system using a citrate buffer with polyethylene glycol (PEG), where the citrate buffer served for ion exchange and acidification and the PEG functioned for dehydration. This biomimetic condition induced the formation of solid fibers with a core–shell structure. The PEG layer could be subsequently removed by the equipped water bath, resulting in amorphous silk fibers. Due to the amorphous state, the silk fibers could be stretched at up to 12 times the original reel speed. Eventually, the mechanical properties featured an extraordinary extension of ~100% and a toughness of ~70 MJ/m 3 . The crystalline state of the resultant fibers was characterized by synchrotron WAXS to determine the degree of crystallinity and orientation of the beta-sheet structure. Interestingly, the citrate buffer-mediated spinning system enabled tuning of the induction of crystallization by changing the citrate buffer concentrations and coagulation time. The current amorphous spinning of regenerated silk fibers provided in-depth insights into the green and sustainable fabrication of artificial capture-silk-like fibers with unique extensibility and toughness. Inspired by the natural spinning process, we developed an aqueous spinning system with a citrate/polyethylene glycol buffer for highly extensible silk fibers. This system enabled tuning of the induction of crystallization through the buffer conditions.

中文翻译：

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带有柠檬酸盐缓冲液的水性纺丝系统，用于高延展性丝纤维

受自然纺丝过程的启发，我们开发了一种使用柠檬酸盐缓冲液和聚乙二醇 (PEG) 的水性湿法纺丝系统，其中柠檬酸盐缓冲液用于离子交换和酸化，而 PEG 用于脱水。这种仿生条件诱导了具有核壳结构的固体纤维的形成。随后可以通过配备的水浴去除 PEG 层，从而产生无定形丝纤维。由于处于无定形状态，丝纤维可以以原始卷轴速度的 12 倍进行拉伸。最终，机械性能具有~100% 的非凡延伸和~70 MJ/m 3 的韧性。所得纤维的结晶状态由同步加速器 WAXS 表征，以确定β-折叠结构的结晶度和取向。有趣的是，柠檬酸缓冲液介导的纺丝系统能够通过改变柠檬酸缓冲液浓度和凝固时间来调节结晶诱导。当前再生丝纤维的无定形纺丝提供了对具有独特延伸性和韧性的人造捕获丝状纤维的绿色和可持续制造的深入见解。受自然纺丝工艺的启发，我们开发了一种含有柠檬酸盐/聚乙二醇缓冲液的水性纺丝系统，用于高延展性丝纤维。该系统能够通过缓冲条件调节结晶诱导。当前再生丝纤维的无定形纺丝提供了对具有独特延伸性和韧性的人造捕获丝状纤维的绿色和可持续制造的深入见解。受自然纺丝工艺的启发，我们开发了一种含有柠檬酸盐/聚乙二醇缓冲液的水性纺丝系统，用于高延展性丝纤维。该系统能够通过缓冲条件调节结晶诱导。当前再生丝纤维的无定形纺丝提供了对具有独特延伸性和韧性的人造捕获丝状纤维的绿色和可持续制造的深入见解。受自然纺丝工艺的启发，我们开发了一种含有柠檬酸盐/聚乙二醇缓冲液的水性纺丝系统，用于高延展性丝纤维。该系统能够通过缓冲条件调节结晶诱导。