The crucial role of amorphous surface layer in the antibacterial Ca/P/Al containing coating
The crucial role of amorphous surface layer in the antibacterial Ca/P/Al containing coating
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DOI：
10.1016/j.surfcoat.2021.127578
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发表时间：
2021-10
影响因子：
5.4
通讯作者：
Tong Zhou;Ruoyun Wang;Xinwen Zhang;Jie Liu;Fei Long;Xuan Li;Lei Liu
中科院分区：
文献类型：
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作者：
Tong Zhou;Ruoyun Wang;Xinwen Zhang;Jie Liu;Fei Long;Xuan Li;Lei Liu
抗菌微弧氧化（MAO）涂层的兴起满足了生物材料和生物污染领域的迫切应用需求，我们前期的工作初步揭示了含Ca/P/Al的MAO涂层的抗菌活性与活性氧（ROS）和非晶态面层有关。本文进一步验证了非晶表面层的特定抗菌过程和功能与电子存储和电偶腐蚀密切相关。无定形表面层收集细菌释放的电子，导致胞外ROS的产生，同时，双层微观结构和富含电子/空穴区域存在的电位差导致电偶腐蚀，扰乱了细菌代谢适宜的H+浓度梯度，这些过程协同作用导致细菌结构损伤。此外，在热处理后非晶态表面层完全再结晶后，涂层几乎失去了其显著的抗菌性能，非晶态表面层决定了含Ca/P/Al MAO涂层的抗菌性能。
The rise of the antibacterial microarc oxidation (MAO) coating satisfies the urgent application requirements in the field of biomaterials and biofouling, and the antibacterial activity of Ca/P/Al containing MAO coating is preliminarily disclosed to be related to the reactive oxygen species (ROS) and amorphous surface layer in our previous work. Herein, the specific antibacterial process and function of amorphous surface layer is further verified to be closely linked to the electron storage and galvanic corrosion in this work. The amorphous surface layer collects the electrons released by bacteria and causes the generation of extracellular ROS, meanwhile, the potential difference existing in the bilayer microstructure and electron/hole-rich areas leads to galvanic corrosion, disturbing the suitable H+concentration gradient for bacterial metabolism, these processes synergistically cause the bacterial structural damage. Furthermore, the coating almost loses its remarkable antibacterial property once amorphous surface layer is entirely recrystallized after heat treatment, and amorphous surface layer determines the antibacterial performance of the Ca/P/Al containing MAO coating.