Microstructure, antibacterial properties and wear resistance of plasma Cu–Ni surface modified titanium

2013 ◽  
Vol 232 ◽  
pp. 515-520 ◽  
Author(s):  
Xiangyu Zhang ◽  
Yong Ma ◽  
Naiming Lin ◽  
Xiaobo Huang ◽  
Ruiqiang Hang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Antibacterial Properties ◽  
Surface Modified

Assembly of Gentamicin and Zn2+ Loaded Coatings on TiO2 Nanotubes to Synergistically Improve the Blood Compatibility, Endothelial Cell Growth and Antibacterial Activities

2020 ◽  
Author(s):  
Changjiang Pan ◽  
Ya Yang ◽  
Youdong Hu ◽  
Li Quan ◽  
Yanchun Wei ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Blood Compatibility ◽  
Antibacterial Properties ◽  
Functional Expression ◽  
Antibacterial Activities ◽  
Layer By Layer ◽  
Zinc Ions ◽  
Continuous Release ◽  
Albumin Adsorption ◽  
Surface Modified

Abstract Titanium and its alloys are widely used in blood contacting implantable and interventional medical devices; however, their biocompatibility is still facing great challenges. In this study, with the aim of improving the biocompatibility and antibacterial activities of titanium, TiO2 nanotubes with a diameter of about 30 nm were firstly prepared on the titanium surface by anodization, followed by the introduction of polyacrylic acid (PAA) and gentamicin (GS) on the nanotube surface by layer-by-layer method, and finally zinc ions were loaded into the surface to improve the bioactivities. The nanotubes have excellent hydrophilic properties and special nanotube-like structure, which can selectively promote the albumin adsorption and enhance the blood compatibility and promote the growth and functional expression of endothelial cells to a certain extent. After the introduction of PAA and GS, although the super-hydrophilicity cannot be achieved, the results of platelet adhesion, cGMP activity, hemolysis rate and partial thromboplastin time (APTT) showed that the blood compatibility was improved, and the blood compatibility was further enhanced after zinc ions loading on the surface. On the other hand, the surface modified materials showed good cytocompatibility to endothelial cells. The introduction of PAA and zinc ions not only promoted the adhesion and proliferation of endothelial cells, but also up-regulated expression of vascular endothelial growth factor (VEGF) and nitric oxide (NO). The slow and continuous release of GS and Zn2+ for more than 14 days, which can significantly improve the antibacterial properties of the materials. Therefore, the present study provides an effective method for the surface modification of titanium-based blood-contacting materials to simultaneously endow with good blood compatibility, endothelial growth behaviors and antibacterial properties.

scholarly journals Wear resistance of a metal surface modified with minerals

2016 ◽  
Vol 110 ◽  
pp. 012048
Author(s):  
S V Kislov ◽  
V G Kislov ◽  
P V Balasch ◽  
A V Skazochkin ◽  
G G Bondarenko ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Metal Surface ◽  
Surface Modified

Improvement of Microstructure and Wear resistance of X12 Tool Steel by Using Laser Surface Re-Melting Technique

2021 ◽  
Vol 1021 ◽  
pp. 260-269
Author(s):  
Haneen M. Al-Tamimi ◽  
Ahmed O. Al-Roubaiy ◽  
Nawal Mohammed Dawood
Keyword(s):  
Wear Resistance ◽  
Rapid Solidification ◽  
Tool Steel ◽  
Scanning Speed ◽  
Laser Surface ◽  
Laser Technique ◽  
Yag Lasers ◽  
Δ Ferrite ◽  
Surface Modified ◽  
Pin On Disk

Nd-YAG lasers have been successfully used in recent years as reliable heat source to surface modification of engineering materials such as laser surface re-melting. In the present study, X12 tool steel was surface modified by using pulse Nd-YAG laser technique. Laser parameters are selected of 12 J pulse energy, 15 Hz frequency, 20 mm defocus length, 6 ms pulse duration, and 5.6 mm /s mm scanning speed. These parameters were chosen after undertaking trials to give suitable parameters in this process. Optical microscopy and backscattered scanning electron microscopy (SEM) with EDS and X-ray diffraction techniques were used to analyse the microstructure changes of the surface of tool steel. Wear resistance test was achieved by using a pin on disk method. The reason for this work is to improve the wear resistance for surface layer of tool steel after changes the morphology of the structure by rapid solidification during laser re-melting. In general, the structure consists of the dendrite and cellular structures with δ ferrite formed under conditions of rapid solidification without the primary coarse carbides. After laser melting, the results of the structure at the surface layers show an increase in wear resistance.

The sliding wear resistance and frictional characteristics of surface modified aluminium alloys under extreme pressure

Wear ◽  
1999 ◽  
Vol 225-229 ◽  
pp. 127-134 ◽  
Author(s):  
P.A Dearnley ◽  
J Gummersbach ◽  
H Weiss ◽  
A.A Ogwu ◽  
T.J Davies
Keyword(s):  
Wear Resistance ◽  
Aluminium Alloys ◽  
Sliding Wear ◽  
Extreme Pressure ◽  
Surface Modified

Improvement in Wear and Corrosive Wear Resistance of Ti6Al4V Alloy by Double Glow Plasma Surface Alloying with W-Mo and W-Mo-N

2011 ◽  
Vol 675-677 ◽  
pp. 1253-1257 ◽  
Author(s):  
Chang Bin Tang ◽  
Dao Xin Liu ◽  
Fan Qiao Li ◽  
Bin Tang ◽  
Lin Qin
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Ambient Air ◽  
Corrosive Wear ◽  
Surface Alloying ◽  
Nacl Solution ◽  
Plasma Surface ◽  
Glow Plasma ◽  
Surface Modified ◽  
Plasma Surface Alloying

W-Mo and W-Mo-N surface-modified layers on Ti6Al4V alloy were obtained using a double glow plasma surface alloying technique. The morphology, microstructure, and chemical composition distribution of the modified layers were analyzed by scanning electron microscope, Xray diffraction, and glow discharge optical emission spectrometry. The hardness and toughness of the modified layers were measured using a micro-hardness tester, and dynamic repeating press equipment. The wear resistance in ambient air and the corrosive wear resistance in NaCl solution were evaluated using a ball-on-disk wear tester. The results show that W-Mo and W-Mo-N surface modified layers are composed of the alloying layers which vary in composition and phase form along the depth. A microhardness gradient was observed in the modified-surface layers. The surface hardness of the W-Mo-N and W-Mo modified layers was 25.3 and 14.2 GPa, which is seven-fold and 3.9-fold harder than the Ti6Al4V substrate, respectively. W-Mo and W-Mo-N surface-modified layers significantly improved the wear and corrosion resistance of Ti6Al4V. It seems that the wear resistance of W-Mo and W-Mo-N surface-modified layers in NaCl solution is better than that in ambient air owing to the strong lubricating effect of NaCl solution and the excellent corrosion resistance of the modified layers.

scholarly journals Wear resistance of a metal surface modified with minerals

2016 ◽  
Vol 110 ◽  
pp. 012096
Author(s):  
S V Kislov ◽  
V G Kislov ◽  
P V Balasch ◽  
A V Skazochkin ◽  
G G Bondarenko ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Metal Surface ◽  
Surface Modified

Biological functionalization of poly (lactic-co-glycolic acid) with ammonia and chitosan–gelatin combined treatment for acupoint catgut-embedding therapy

2021 ◽  
pp. 004051752198927
Author(s):  
Shaoju Fu ◽  
Peihua Zhang
Keyword(s):  
Mechanical Properties ◽  
Glycolic Acid ◽  
Combined Treatment ◽  
Antibacterial Properties ◽  
Ammonia Solution ◽  
Embedding Therapy ◽  
Gelatin Coating ◽  
Surface Modified ◽  
And Staphylococcus Aureus

Polylactic-co-glycolic acid (PLGA) has attracted extensive attention in acupoint catgut embedding therapy (ACET). However, developing biological functionalization for ACET materials remains challenging to due to its poor surface properties. In this work, PLGA was first treated with ammonia solution, and chitosan–gelatin coating was then introduced onto the surface of PLGA braided thread to achieve biological functionalization. Characteristics such as structural, mechanical, and in vitro properties were then fully evaluated. The results showed that modified samples showed more surface roughness than non-modified ones, and weight and diameter changes in samples increased after coating treatment, together with surface hydrophilicity; mechanical properties such as tensile property and bending stiffness of samples were greatly enhanced. Non-coated samples exhibited no antibacterial properties, while that of coated samples showed different antibacterial properties against Escherichia coli and Staphylococcus aureus. No samples showed toxicity, with more than 75% cells viable. In sum, the strategy of surface-modified PLGA using a combined ammonia and chitosan–gelatin treatment showed great potential in the application of ACET.

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