The limited mechanical performance and functional constraints of alginate fibers significantly impede their development in the context of professional research. To address the aforementioned issues, this study initially utilized polyethyleneimine (PEI) and citric acid to synthesize carbon quantum dots (CD) with surface amino functionalization. Subsequently, in a sodium alginate (SA) solution, CD and vinyl silicon-based nanoparticles (VSNP) were co-introduced. Utilizing the abundant hydroxyl and carboxyl groups in polysaccharides, stable interactions were achieved with CD and VSNP. Incorporating a dynamic hydrogen-bonded crosslinking network among CD, VSNP and SA, the establishment of a calcium alginate (CA) ionically crosslinked network is facilitated via calcium-sodium ion exchange. Additionally, the interwoven and interlocked structure between the aforementioned dual networks was established. Employing a wet spinning process, the synergistic multiple dynamic energy dissipation mechanisms significantly enhance the mechanical performance. Fluorescent alginate fibers (CA/VSNP/CD) were prepared. The tensile strength was 3.81 cN/dtex, and the elongation at break was 13.16%. Compared to pure CA fibers, there were respective increases of 95.38% and 82.02%. Simultaneously, the fibers exhibit excitation-dependent emission characteristics. This work lays the foundation for potential applications of fluorescent alginate fibers in environmental monitoring, chemical sensors, dynamic anti-counterfeiting, and biomedical fields.

中文翻译：

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用于合成高韧性荧光海藻酸盐纤维的混合交联

海藻酸盐纤维有限的机械性能和功能限制严重阻碍了其在专业研究中的发展。为了解决上述问题，本研究首先利用聚乙烯亚胺（PEI）和柠檬酸合成表面氨基功能化的碳量子点（CD）。随后，在海藻酸钠（SA）溶液中，同时引入CD和乙烯基硅基纳米颗粒（VSNP）。利用多糖中丰富的羟基和羧基，与CD和VSNP实现了稳定的相互作用。在 CD、VSNP 和 SA 之间结合动态氢键交联网络，通过钙钠离子交换促进海藻酸钙 (CA) 离子交联网络的建立。此外，在上述双网络之间建立了交织和互锁的结构。采用湿法纺丝工艺，协同的多重动态耗能机制显着提高了机械性能。制备荧光藻酸盐纤维(CA/VSNP/CD)。拉伸强度为3.81cN/dtex，断裂伸长率为13.16%。与纯CA纤维相比，分别提高了95.38%和82.02%。同时，纤维表现出与激发相关的发射特性。该工作为荧光海藻酸盐纤维在环境监测、化学传感器、动态防伪、生物医学等领域的潜在应用奠定了基础。