Voicu Manuela Elena, Demetrescu Ioana, Dorobantu Andrei, Enachescu Marius, Buica George-Octavian, Ionita Daniela
Department of General Chemistry, Faculty of Applied Chemistry and Material Science, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
Academy of Romanian Scientists, 3 Ilfov Street, 050044 Bucharest, Romania.
Nanomaterials (Basel). 2022 Apr 16;12(8):1369. doi: 10.3390/nano12081369.
A modified biodegradable magnesium alloy (AZ31, 96 wt% Mg, 3 wt% Al, and 1 wt% Zn) with polylactic acid (PLA) nanofibers was obtained by the electrospinning technique. The presence of PLA nanofibers was evidenced using Fourier transform infrared spectroscopy (FT-IR) and using an scanning electronic microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDX) module. The degradation behavior of an uncoated Mg alloy and a Mg alloy coated with PLA was evaluated through hydrogen evolution, pH, and electrochemical measurements in simulated body fluid. Contact angle measurements showed a shift from hydrophilic towards the hydrophobic character of the alloy after its coating with PLA nanofibers. Furthermore, the electrochemical measurement results show that the Mg based alloy coated with PLA inhibits hydrogen evolution, thus being less prone to degradation. The aim of this research is not only to reduce the corrosion rate of Mg alloy and to improve its properties with the help of polylactic acid coating, but also to provide a study to understand the hydrophilic-hydrophobic balance of biodegradable magnesium based on surface energy investigations. Taking into account corrosion rate, wettability, and pH changes, an empiric model of the interaction of Mg alloy with PLA nanofibers is proposed.
通过静电纺丝技术获得了一种含有聚乳酸（PLA）纳米纤维的改性可生物降解镁合金（AZ31，96 wt% Mg，3 wt% Al，1 wt% Zn）。使用傅里叶变换红外光谱（FT-IR）以及配备能量色散X射线光谱（EDX）模块的扫描电子显微镜（SEM）证实了PLA纳米纤维的存在。通过在模拟体液中进行析氢、pH值和电化学测量，评估了未涂层镁合金和涂覆PLA的镁合金的降解行为。接触角测量表明，用PLA纳米纤维涂覆合金后，合金的特性从亲水性转变为疏水性。此外，电化学测量结果表明，涂覆PLA的镁基合金抑制了析氢，因此更不易降解。本研究的目的不仅是借助聚乳酸涂层降低镁合金的腐蚀速率并改善其性能，还旨在基于表面能研究提供一项关于理解可生物降解镁亲疏水平衡的研究。考虑到腐蚀速率、润湿性和pH值变化，提出了镁合金与PLA纳米纤维相互作用的经验模型。
