College of Materials, Research Institution for Biomimetics and Soft Matter, Fujian Key Provincial Laboratory for Soft Functional Materials Research, Xiamen University, 422 Siming Nan Road, Xiamen, 361005, P. R. China.
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Republic of Singapore.
Small. 2022 Mar;18(11):e2107196. doi: 10.1002/smll.202107196. Epub 2022 Jan 20.
Solid photothermal materials with favorable biocompatibility and modifiable mechanical properties demonstrate obvious superiority and growing demand. In this work, polydopamine (PDA) induced functionalization of regenerated silk fibroin (RSF) fibers has satisfactory photothermal conversion ability and flexibility. Based on multilevel engineering, RSF solution containing PDA nanoparticles is wet spun to PDA-incorporating RSF (PDA@RSF) fibers, and then the fibers are coated with PDA via oxidative self-polymerization of dopamine to form PDA@RSF-PDA (PRP) fibers. During the wet spinning process, PDA is to adjust the mechanical properties of RSF by affecting its hierarchical structure. Meanwhile, coated PDA gives the PRP fibers extensive absorption of near-infrared light and sunlight, which is further fabricated into PRP fibrous membranes. The temperature of PRP fibrous membranes can be adjusted and increases to about 50 °C within 360 s under 808 nm laser irradiation with a power density of 0.6 W cm , and PRP fibrous membranes exhibit effective photothermal cytotoxicity both in vitro and in vivo. Under the simulated sunlight, the temperature of PRP fiber increases to more than 200 °C from room temperature and the material can generate 4.5 V voltage when assembled with a differential thermal battery, which means that the material also has the potential for flexible wearable electronic devices.
具有良好生物相容性和可调节机械性能的固态光热材料表现出明显的优势和日益增长的需求。在这项工作中，通过聚多巴胺（PDA）诱导的再生丝素纤维（RSF）功能化，得到了具有良好光热转换能力和柔韧性的纤维。基于多级工程，将含有 PDA 纳米颗粒的 RSF 溶液湿法纺丝得到 PDA 掺入 RSF（PDA@RSF）纤维，然后通过多巴胺的氧化自聚合在纤维上涂覆 PDA，形成 PDA@RSF-PDA（PRP）纤维。在湿法纺丝过程中，PDA 通过影响其分级结构来调节 RSF 的机械性能。同时，涂覆的 PDA 使 PRP 纤维广泛吸收近红外光和太阳光，并进一步制备成 PRP 纤维膜。PRP 纤维膜在 808nm 激光照射下（功率密度为 0.6W/cm ），温度可在 360s 内调节至约 50°C，在体外和体内均表现出有效的光热细胞毒性。在模拟太阳光下，PRP 纤维的温度从室温升高到 200°C 以上，当与温差电池组装时，材料可产生 4.5V 电压，这意味着该材料也具有用于柔性可穿戴电子设备的潜力。
