Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Key Lab of Biomass-Based Green Fuel and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
J Mater Chem B. 2019 Mar 7;7(9):1450-1459. doi: 10.1039/c8tb03005g. Epub 2019 Feb 6.
Direct extraction of silk nanofibers (SNs) from natural silk fibers was developed via a low-intensity ultrasonic-assisted sulfuric acid hydrolysis process. The effects of sulfuric acid (HSO) amount, hydrolysis time and temperature were investigated. SNs with a length and width of 306 ± 107 nm and 4-18 nm, respectively, were obtained with a yield of 64.54%. Furthermore, unlike for the silk nanofibers formed from a regeneration process, the original crystal structure of the silk was maintained. The aqueous dispersion of SNs was steady for at least 30 days at pH 3 and 7-10 with no aggregation. Furthermore, the as-prepared SNs were amphoteric due to the intrinsic characteristics of the protein that endow them with the ability to mix well with either positively or negatively charged polymers, possibly contributing to the field of high-tech silk materials in the future.
通过低强度超声辅助硫酸水解工艺，直接从天然丝纤维中提取丝纳米纤维（SNs）。考察了硫酸（HSO）用量、水解时间和温度的影响。得到的 SNs 的长度和宽度分别为 306±107nm 和 4-18nm，产率为 64.54%。此外，与再生过程形成的丝纳米纤维不同，丝的原始晶体结构得以保持。在 pH 3 和 7-10 下，SNs 的水分散体至少稳定 30 天，没有聚集。此外，由于蛋白质的固有特性，所制备的 SNs 具有两性，使其能够与正电荷或负电荷聚合物良好混合，这可能为未来的高科技丝材料领域做出贡献。
