Necula B S, Fratila-Apachitei L E, Berkani A, Apachitei I, Duszczyk J
Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands.
J Mater Sci Mater Med. 2009 Jan;20(1):339-45. doi: 10.1007/s10856-008-3589-9. Epub 2008 Sep 21.
The growing fight against infections caused by bacteria poses new challenges for development of materials and medical devices with antimicrobial properties. Silver is a well known antimicrobial agent and has recently started to be used in nanoparticulate form, with the advantage of a high specific surface area and a continuous release of enough concentration of silver ions/radicals. The synthesis of MgO-Ag nanocomposite coatings by in situ deposition of silver nanoparticles during plasma electrolytic oxidation of a magnesium substrate is presented in this study. The process was performed in an electrolyte containing Ag nanoparticles under different oxidation conditions (i.e., current density, oxidizing time, silver nanoparticles concentration in the electrolyte). Surface morphology, phase composition and elemental composition (on the surface and across the thickness of MgO-Ag nanocomposite coatings) were assessed by scanning electron microscopy, X-ray diffraction, energy X-ray dispersive spectrometry and radio frequency glow discharge optical emission spectroscopy, respectively. The coatings were found to be porous, around 7 mum thick, consisting of a crystalline oxide matrix embedded with silver nanoparticles. The findings suggest that plasma electrolytic oxidation process has potential for the synthesis of MgO-Ag nanocomposite coatings.
对抗由细菌引起的感染的斗争日益激烈，这给具有抗菌特性的材料和医疗器械的开发带来了新的挑战。银是一种众所周知的抗菌剂，最近开始以纳米颗粒形式使用，具有高比表面积和持续释放足够浓度的银离子/自由基的优点。本研究介绍了通过在镁基体的等离子体电解氧化过程中原位沉积银纳米颗粒来合成MgO-Ag纳米复合涂层的方法。该过程在含有银纳米颗粒的电解液中于不同氧化条件（即电流密度、氧化时间、电解液中银纳米颗粒浓度）下进行。分别通过扫描电子显微镜、X射线衍射、能量X射线色散光谱和射频辉光放电光发射光谱对表面形貌、相组成和元素组成（在MgO-Ag纳米复合涂层的表面和整个厚度上）进行了评估。发现涂层是多孔的，厚度约为7微米，由嵌入银纳米颗粒的结晶氧化物基体组成。研究结果表明，等离子体电解氧化过程在合成MgO-Ag纳米复合涂层方面具有潜力。
