Antibacterial sol-gel AgMnFe2O4 composite coatings added with degradable MgO

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-07-11 DOI:10.1007/s10971-024-06481-y

T. Fu, P. Ning, S. Naeem, X. Ma

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Abstract

The AgMnFe₂O₄-MgO composite coatings with the Ag/(Mn+Fe) atomic ratio of 0, 0.3%, 1% and 3%, respectively were prepared by sol-gel method to improve antibacterial property and biocompatibility of titanium for orthopaedic implants. SEM observation shows rare cracks of the films due to the gelling effect of MgO and silver nanoparticles precipitation at the surface. XRD analysis reveals the decreased crystallinity of MnFe₂O₄ by the addition of MgO. XPS analysis indicates metallic Ag, high-valence manganese, Fe³⁺ and Mg²⁺ species in the composite film. Contact angle measurement and potentiodynamic polarization test show that the coating samples have higher contact angles and better corrosion resistance than the polished titanium. The bonding strength of the coating is relatively low tested by the pull-out method (2.6 MPa for sample with 1%Ag). Plate counting test demonstrates the silver content dependent antibacterial activity of the coating samples against E. coli, and the antibacterial rate reaches 100% at 1%Ag. MTT assay shows good compatibility with MC3T3-E1 cells for the samples with Ag ratio up to 1%. Silver, manganese ferrite and degradable MgO together determine the biological properties of the composite coatings.

Graphical Abstract

Abstract Image

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添加了可降解氧化镁的抗菌溶胶凝胶 AgMnFe2O4 复合涂层

采用溶胶-凝胶法制备了Ag/（Mn+Fe）原子比分别为0、0.3%、1%和3%的AgMnFe2O4-MgO复合涂层，以改善骨科植入物用钛的抗菌性能和生物相容性。扫描电镜观察显示，由于氧化镁的胶凝效应和银纳米粒子在表面的沉淀，薄膜出现了罕见的裂纹。XRD 分析表明，氧化镁的加入降低了 MnFe2O4 的结晶度。XPS 分析表明复合薄膜中存在金属银、高价锰、Fe3+ 和 Mg2+ 物种。接触角测量和电位极化测试表明，涂层样品比抛光钛具有更高的接触角和更好的耐腐蚀性。通过拉拔法测试，涂层的粘合强度相对较低（含 1%银的样品为 2.6 兆帕）。平板计数测试表明，涂层样品对大肠杆菌的抗菌活性与银含量有关，银含量为 1%时，抗菌率达到 100%。MTT 试验表明，银含量高达 1%的样品与 MC3T3-E1 细胞的相容性良好。银、锰铁氧体和可降解氧化镁共同决定了复合涂层的生物特性。图文摘要

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.