在 Ti6Al4V 合金上进行功能化氧化石墨烯涂层，以提高生物相容性和耐腐蚀性。
Functionalized graphene oxide coating on Ti6Al4V alloy for improved biocompatibility and corrosion resistance.
机构信息
School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI 48859, USA.
Department of Materials Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Department of Metallurgy and Materials Engineering, CEET, University of the Punjab, 54590 Lahore, Pakistan.
出版信息
Mater Sci Eng C Mater Biol Appl. 2019 Jan 1;94:920-928. doi: 10.1016/j.msec.2018.10.046. Epub 2018 Oct 11.
The present study focused on the development of magnesium-functionalized graphene oxide (FGO) coating on titanium alloy (Ti6Al4V) by electrophoretic deposition. Graphene oxide (GO) was synthesized by modified Hummers' method and functionalized with magnesium ions. X-ray diffraction, infrared spectroscopy (IR) and Raman spectroscopy were employed to confirm the synthesis of GO and GO-coatings on Ti6Al4V. Functionalization of GO with Mg ions was confirmed by energy dispersive X-ray spectroscopy. The surface morphology of coated samples was examined through scanning electron microscopy. Reduction of FGO coating (labelled as rFGO) by heating at 200 °C was confirmed by IR. The rFGO coated Ti6Al4V was found to be hydrophilic in nature as determined by contact angle measurement which showed reduction in the contact angle of Ti6Al4V from 95.4° to 42.1°. The percent cell viability over the coated sample was appreciably improved compared to as-received Ti6Al4V sample owing to hydrophilicity of the former. The positive shift in open circuit potential and increase in polarization resistance was observed after coating Ti6Al4V samples with FGO. The significant decrease in the corrosion current density and negative polarization loop in the reverse scan of samples also confirmed the improved corrosion resistance of rFGO-coated Ti6Al4V over uncoated Ti6Al4V in the PBS solution. Furthermore, the impedance spectroscopy revealed that the preferential adsorption of ionic species (indicated by large R) at the surface improved the barrier characteristics of rFGO coated samples and exhibited an order of magnitude higher R compared to as-received samples.
本研究通过电泳沉积法专注于在钛合金（Ti6Al4V）上开发镁功能化氧化石墨烯（FGO）涂层。氧化石墨烯（GO）通过改良的 Hummers 法合成，并通过镁离子功能化。X 射线衍射、红外光谱（IR）和拉曼光谱用于证实 GO 和 GO 涂层在 Ti6Al4V 上的合成。通过能量色散 X 射线光谱证实 GO 与 Mg 离子的功能化。通过扫描电子显微镜检查涂层样品的表面形态。通过在 200°C 加热证实 FGO 涂层（标记为 rFGO）的还原。通过接触角测量确定 rFGO 涂层的 Ti6Al4V 具有亲水性，表明 Ti6Al4V 的接触角从 95.4°降低到 42.1°。与原始 Ti6Al4V 样品相比，涂层样品的细胞存活率显著提高，这是由于前者的亲水性。在 Ti6Al4V 样品上涂覆 FGO 后，观察到开路电位的正移和极化电阻的增加。在 PBS 溶液中，涂层 Ti6Al4V 样品的腐蚀电流密度显著降低和反向扫描中负极化环的出现也证实了 rFGO 涂层 Ti6Al4V 相对于未涂层 Ti6Al4V 的耐腐蚀性得到改善。此外，阻抗谱表明表面上离子物种（由大 R 表示）的优先吸附改善了 rFGO 涂层样品的阻挡特性，并表现出比原始样品高一个数量级的 R。
Zotero 插件