Control of surface cmposition and microstructure of nano super-hydrophilic TiO2-CuOy coatings through reactive sputtering to improve antibacterial ability, corrosion resistance, and biocompatibility

2021 ◽  
pp. 151893
Author(s):  
Junqiang Wang ◽  
MengFan Liang ◽  
Yong Pan ◽  
Shuhong Sun ◽  
Tao Shen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Reactive Sputtering ◽  
Antibacterial Ability

Mg alloy surface immobilised with caerin peptides acquires enhanced antibacterial ability and improved corrosion resistance

2020 ◽  
Author(s):  
Tianfang Wang ◽  
Guoying Ni ◽  
Tsuyoshi Furushima ◽  
Hui Diao ◽  
Pingping Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Antibacterial Effect ◽  
Click Reaction ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Alloy Sample ◽  
Plasma Chemical ◽  
Antibacterial Ability ◽  
Comparison Results

Abstract Magnesium (Mg) has mechanical properties similar to human bones and Mg alloy is considered ideal medical implant material. However, the high velocity of degradation inside the human inner environment severely hampers the usage of Mg alloys. In this study, caerin peptide 1.9 (F3) and a modified sequence of caerin 1.1 (F1) with anti-bacterial activity, were covalently immobilised on the surface of Mg alloys by plasma chemical click reaction. The in vitro antibacterial activity and corrosion resistance of these caerin peptide-immobilised Mg alloys were investigated in Dulbecco's Modified Eagle Medium (DMEM) solution. Un-immobilised Mg alloy sample, blank drug-sensitive tablet (BASD) and a commonly used antibiotics Tazocin were used for comparison. Results showed that peptide immobilised Mg samples showed significant improved corrosion resistance and prolonged antibacterial effect compared to non-immobilised Mg alloy and free caerin peptides. Furthermore, annealing or extruding treatment of Mg alloys improved the behaviours of corrosion resistance and antibacterial property. These results indicate that coating Mg alloy with caerin peptides improves the corrosion resistance in vitro and increases the alloy’s antibacterial ability. The mechanism underlying the prolonged antibacterial effect for annealed Mg alloys immobilised with the peptides (especially F3) remains unclear, which worth further experimental and theoretical investigation.

Based on the synergistic effect of Mg2+ and antibacterial peptides to improve the corrosion resistance, antibacterial ability and osteogenic activity of magnesium-based degradable metals

2021 ◽  
Author(s):  
Wenhao Zhou ◽  
Jianglong Yan ◽  
Yangyang Li ◽  
Lan Wang ◽  
Lei Jing ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Synergistic Effect ◽  
Surface Properties ◽  
Antibacterial Peptides ◽  
Antibacterial Ability ◽  
Orthopedic Device ◽  
Osteogenic Activity ◽  
Biodegradable Metals ◽  
Device Applications

Magnesium (Mg) and its alloys have been widely investigated as the most promising biodegradable metals for orthopedic device applications, but its surface properties should be further improved to overcome the restricted osteogenesis and fast degradation problems.

Mg alloy surface immobilised with caerin peptides acquires enhanced antibacterial ability and putatively improved corrosion resistance

2021 ◽  
Vol 121 ◽  
pp. 111819
Author(s):  
Tianfang Wang ◽  
Guoying Ni ◽  
Tsuyoshi Furushima ◽  
Hui Diao ◽  
Pingping Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Mg Alloy ◽  
Alloy Surface ◽  
Antibacterial Ability

Effect of aging temperature on corrosion resistance and antibacterial ability of 0Cu2Cr carbon steel

2021 ◽  
Author(s):  
Jing Guo ◽  
Kuijun Fu ◽  
Yingxue Teng ◽  
Jiaji Wang ◽  
Qihang Pang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Aging Temperature ◽  
Antibacterial Ability

scholarly journals Advances in Antibacterial Functionalized Coatings on Mg and Its Alloys for Medical Use—A Review

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 828
Author(s):  
Dan Zhang ◽  
Ying Liu ◽  
Zhaogang Liu ◽  
Qiang Wang
Keyword(s):  
Corrosion Resistance ◽  
Degradation Rate ◽  
Composite Coatings ◽  
Alkaline Ph ◽  
Antibacterial Ability ◽  
Infected Wounds ◽  
Patients With Diabetes ◽  
Biological Environment ◽  
Functionalized Coatings

As a revolutionary implant material, magnesium and its alloys have many exciting performances, such as biodegradability, mechanical compatibility, and excellent biosecurity. However, the rapid and uncontrollable degradation rate of magnesium greatly hampers its clinical use. Many efforts have been taken to enhance the corrosion resistance of magnesium. However, it must be noted that improving the corrosion resistance of magnesium will lead to the compromise of its antibacterial abilities, which are attribute and proportional to the alkaline pH during its degradation. Providing antibacterial functionalized coating is one of the best methods for balancing the degradation rate and the antibacterial ability of magnesium. Antibacterial functionalized magnesium is especially well-suited for patients with diabetes and infected wounds. Considering the extremely complex biological environment in the human body and the demands of enhancing corrosion resistance, biocompatibility, osteogenesis, and antibacterial ability, composite coatings with combined properties of different materials may be promising. The aim of this review isto collect and compare recent studies on antibacterial functionalized coatings on magnesium and its alloys. The clinical applications of antibacterial functionalized coatings and their material characteristics, antibacterial abilities, in vitro cytocompatibility, and corrosion resistance are also discussed in detail.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

Preparation and characterization of thin films of carbon nitride

1995 ◽  
Vol 53 ◽  
pp. 104-105
Author(s):  
L. Wan ◽  
R. F. Egerton
Keyword(s):  
Carbon Nitride ◽  
Arc Discharge ◽  
Ion Beam ◽  
Chemical Vapor ◽  
Reactive Sputtering ◽  
Vacuum Arc ◽  
Specimen Preparation ◽  
Bonding Structure ◽  
Electron Energy Loss

INTRODUCTION Recently, a new compound carbon nitride (CNx) has captured the attention of materials scientists, resulting from the prediction of a metastable crystal structure β-C3N4. Calculations showed that the mechanical properties of β-C3N4 are close to those of diamond. Various methods, including high pressure synthesis, ion beam deposition, chemical vapor deposition, plasma enhanced evaporation, and reactive sputtering, have been used in an attempt to make this compound. In this paper, we present the results of electron energy loss spectroscopy (EELS) analysis of composition and bonding structure of CNX films deposited by two different methods.SPECIMEN PREPARATION Specimens were prepared by arc-discharge evaporation and reactive sputtering. The apparatus for evaporation is similar to the traditional setup of vacuum arc-discharge evaporation, but working in a 0.05 torr ambient of nitrogen or ammonia. A bias was applied between the carbon source and the substrate in order to generate more ions and electrons and change their energy. During deposition, this bias causes a secondary discharge between the source and the substrate.

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