摘要
The preparation of functionalized chitin nanofibers through sustainable chemical modification methods is of significant importance for advanced sustainable nanomaterials. In this study, fluorescent chitin nanofibers (RFChN) were successfully prepared via amino-yne click chemistry, using deacetylated chitin nanofibers (DEChN) as the raw material and spiropyran with an activated alkyne group (SP-PA) for functionalization. The efficiency of the amino-yne click reaction was confirmed by comparing it with esterification reactions, demonstrating that the amino-yne click reaction provided higher efficiency and milder reaction conditions, resulting in minimal impact on the crystalline structure and morphology of the chitin nanofibers. RFChN exhibited enhanced red fluorescence with aggregation-induced emission (AIE) properties, due to the anchoring effect of the chitin nanofibers. RFChN inks displayed reversible color changes under UV light upon exposure to acidic and alkaline environments, making RFChN inks highly promising for applications in fluorescence-based anti-counterfeiting and environmental monitoring. In addition, RFChN films displayed improved hydrophobicity, with contact angles ranging from 101.34° to 106.71°, and excellent UV-blocking properties, shielding up to 98 % of UVC, 84 % of UVB, and more than 90 % of UVA radiation. Biocompatibility and biodegradability tests showed that RFChN films exhibited minimal cytotoxicity, with cell viability remaining high at 76.75 % after 48 h of exposure. The biodegradability of RFChN films was not compromised by the modification process, with complete degradation observed after 30 days. These results suggest that RFChN possess outstanding properties, including AIE fluorescence, hydrophobicity, UV shielding, biocompatibility, and biodegradability, making them promising candidates for applications in sustainable materials, fluorescent nanocomposites, environmental monitoring, and fluorescence-based sensing technologies.
危险品化学品经营许可证（带存储）