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| 1 | Antibacterial property of a gradient Cu-bearing titanium alloy by laser additive manufacturing显示文摘Streptococcus mutans(S.mutans)is the most common cariogenic bacteria and causes caries by forming biofilms.A novel gradient Cu-bearing titanium alloy(TC4-5Cu/TC4)was manufactured using selective laser melting(SLM)technology for dental applications,which is anticipated to inhibit the formation of biofilm.In this study,the released concentration of copper ions in both minimum inhibitory concentration(MIC)and minimum bactericidal concentration(MBC)was tested in order to assess the antibacterial property of the alloy against planktonic S.mutans,and the antibacterial and antibiofilm efficiencies of TC4-5Cu/TC4 alloy against sessile S.mutans were evaluated via quantitative antibacterial tests and biofilm determination.Reverse transcription polymerase chain reaction(RT-PCR)was performed to analyze the expression of biofilm-related genes(gtfB,gtfC,gtfD,ftf and gbpB)and acid production-related gene(ldh).The results suggested that the MIC and MBC of Cu^(2+)were much higher than the release concentration of copper ions of the alloy,which was consistent with the lack of antibacterial effect against planktonic bacteria.On the contrary,TC4-5Cu/TC4 alloy exhibited significant bactericidal property against the sessile bacteria and efficient biofilm-restrained ability,and all genes detected in this research were down-regulated.The results indicated that the TC4-5Cu/TC4 alloy suppressed biofilm formation and the sessile bacterial viability by down-regulating biofilm-related genes. | Dong-Yang Fan Zhe Yi Xu Feng Wen-Zhi Tian Da-Ke Xu A.M.Cristino Valentino Qiang Wang Hong-Chen Sun | 2022 | Rare Metals2022，41，2： | 1 |
| 2 | Improvement in antibacterial ability and cell cytotoxicity of Ti-Cu alloy by anodic oxidation显示文摘Ti-Cu alloy has potential to be used in plastic surgery and dental implants due to its strong antibacterialproperties,high strength and good corrosion resistance.In this paper,Ti-5Cu was anodic-oxidized to enhance the surface compatibility.The influence of the oxidation on the corrosion resistance,antibacterial properties and biological properties was investigated.X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)results showed that a double-layer oxide coating with dense inner layer and porous outside layer was formed on Ti-Cu sample.The oxide coating consisted mainly of TiO2,CuzO and small amount of CuO,improved the corrosion resistance of Ti-Cu alloy by one order of magnitude due to the formation of the dense oxide inner layer,but high Cu ion release was detected.The plate count results showed that the antibac-terial activity of Ti-Cu sample was improved to≥99%due to the comprehensive function of CuO and Cu_(2)O in the coating and Cu^(2+)release.Cell test results showed that thecoating exhibited good cell compatibility,the porous sur-face structure improved the adhesion of cells,and Cu ion release promoted the cell proliferation. | Shuang Cao Zi-Ming Zhang Jia-Qi Zhang Ren-Xian Wang Xiao-Yan Wang Lei Yang Da-Fu Chen Gao-Wu Qin Er-Lin Zhang | 2022 | Rare Metals2022，41，2： | 1 |
| 3 | Cu含量对生物医用Ti-Cu合金抑菌表现及性能的影响显示文摘本文研究了Cu含量(2.5%、7%和14%,质量分数)对Ti-Cu合金的抑菌、干磨损、腐蚀和腐蚀磨损行为的影响。结果表明:随Cu含量的增加,Ti-Cu合金对金黄色葡萄球菌的抑菌能力和干磨损条件下的耐磨性增高,而模拟体液环境中的耐蚀性和耐腐蚀磨损性能先增高后降低。Ti-Cu合金优秀的抑菌能力主要表现为铜离子的杀菌作用以及合金的抗细菌黏附作用。在干磨损条件下,高硬度的Ti-14Cu合金具有最低的质量损失和最小的摩擦因数,分别为3.34 mg和0.51。当处于模拟体液环境中时,Ti-7Cu合金表面生成的钝化膜电阻最大达到8.82×10^(5)Ω·cm^(2),且在腐蚀磨损条件下具有最低的质量损失和最小的摩擦因数,分别为2.03 mg和0.47。干磨损机制为磨粒磨损和黏着磨损,腐蚀磨损机制为磨粒磨损和剥层磨损。 | 何斌斌 邹海燕 辛程 陈永楠 邓晓彤 赵秦阳 | 2023 | 中国有色金属学报2023，33，8： | 0 |
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