Investigating the tribological and biological performance of covalently grafted chitosan coatings on Co–Cr–Mo alloy

Qin, Li‐Guo; Feng, Xinan; Hafezi, Mahshid; Zhang, Yali; Guo, Junde; Dong, Guangneng; Qin, Yuanbin

doi:10.1016/j.triboint.2018.06.018

Cited by 34 publications

(22 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With this study, the preventative role of bone-resorption in producing wear particles was identified by considering the point that the PMPC-grafted surface is biologically inert in nature. Qin et al [53] reported grafting chitosan on Co-Cr-Mo alloy by applying the layer-by-layer deposition technique. As a result, a significant increase (about seven times) in the wear resistance level was found after investigating its tribological behavior under simulated conditions.…”

Section: Surface Graftingmentioning

confidence: 99%

An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

2019

View full text Add to dashboard Cite

The need for metallic biomaterials will always remain high with their growing demand in joint replacement in the aging population. This creates need for the market and researchers to focus on the development and advancement of the biometals. Desirable characteristics such as excellent biocompatibility, high strength, comparable elastic modulus with bones, good corrosion resistance, and high wear resistance are the significant issues to address for medical implants, particularly load-bearing orthopedic implants. The widespread use of titanium alloys in biomedical implants create a big demand to identify and assess the behavior and performance of these alloys when used in the human body. Being the most commonly used metal alloy in the fabrication of medical implants, mainly because of its good biocompatibility and corrosion resistance together with its high strength to weight ratio, the tribological behavior of these alloys have always been an important subject for study. Titanium alloys with improved wear resistance will of course enhance the longevity of implants in the body. In this paper, tribological performance of titanium alloys (medical grades) is reviewed. Various methods of surface modifications employed for titanium alloys are also discussed in the context of wear behavior.

show abstract

Section: Surface Graftingmentioning

confidence: 99%

An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

2019

View full text Add to dashboard Cite

show abstract

“…Here, air was easily trapped by the rough structure of the samples. The wetting mode of the hydrophilic surface could be considered using the Cassie–Baxter wetting mode, which is mainly used to describe a heterogeneous wetting regime [28]. In this study, the prepared BSLS surface was considered as a typical composite solid–air surface.…”

Section: Resultsmentioning

confidence: 99%

Constructing a Dual-Function Surface by Microcasting and Nanospraying for Efficient Drag Reduction and Potential Antifouling Capabilities

et al. 2019

Self Cite

View full text Add to dashboard Cite

To improve the drag-reducing and antifouling performance of marine equipment, it is indispensable to learn from structures and materials that are found in nature. This is due to their excellent properties, such as intelligence, microminiaturization, hierarchical assembly, and adaptability. Considerable interest has arisen in fabricating surfaces with various types of biomimetic structures, which exhibit promising and synergistic performances similar to living organisms. In this study, a dual bio-inspired shark-skin and lotus-structure (BSLS) surface was developed for fabrication on commercial polyurethane (PU) polymer. Firstly, the shark-skin pattern was transferred on the PU by microcasting. Secondly, hierarchical micro- and nanostructures were introduced by spraying mesoporous silica nanospheres (MSNs). The dual biomimetic substrates were characterized by scanning electron microscopy, water contact angle characterization, antifouling, self-cleaning, and water flow impacting experiments. The results revealed that the BSLS surface exhibited dual biomimetic features. The micro- and nano-lotus-like structures were localized on a replicated shark dermal denticle. A contact angle of 147° was observed on the dual-treated surface and the contact angle hysteresis was decreased by 20% compared with that of the nontreated surface. Fluid drag was determined with shear stress measurements and a drag reduction of 36.7% was found for the biomimetic surface. With continuous impacting of high-speed water for up to 10 h, the biomimetic surface stayed superhydrophobic. Material properties such as inhibition of protein adsorption, mechanical robustness, and self-cleaning performances were evaluated, and the data indicated these behaviors were significantly improved. The mechanisms of drag reduction and self-cleaning are discussed. Our results indicate that this method is a potential strategy for efficient drag reduction and antifouling capabilities.

show abstract

“…PAO4 base oil with viscosity  = 0.024 Pa•s at 30 °C and 0W20 engine oil were provided by Valvoline Inc. The 0W20 engine oil was selected for its two advantages: (1) low viscosity, which is similar to that of PAO4 base oil at room temperature; (2) it contains numerous polar additives, such as dispersants, detergents, and anti-friction and anti-wear additives, which act as dispersants to graft on the particle surface [30] and prevent particle aggregation.…”

Section: Materials and Experimental Process 21 Materialsmentioning

confidence: 99%

Origin of the tribofilm from MoS2 nanoparticle oil additives: Dependence of oil film thickness on particle aggregation in rolling point contact

Wang

Dong

2020

Friction

Self Cite

View full text Add to dashboard Cite

The lubrication effectiveness of MoS2 nanoparticles as an oil additive remains unclear, restricting its application in industry to reduce friction. The goal of this work was to explore the lubrication mechanism of MoS2 nanoparticles as an oil additive. In this study, the oil film thickness behaviors of MoS2 nanoparticles in poly-alpha olefin (PAO4) base oil, PAO4 with 3 wt% dispersant (polyisobutyleneamine succinimide, PIBS), and 0W20 engine oil were investigated using an elastohydrodynamic lubrication (EHL) testing machine. Following the EHL tests, the flow patterns around the contact area and the tribofilm covering rate on contact area were studied using optical microscopy to understand the lubrication mechanism. The results indicate that both the dispersant and nanoparticle aggregation significantly affected the oil film thickness. The expected oil film thickness increase in the case of 0.1 wt% MoS2 in PAO4 base oil was obtained, with an increase from 30 to 60 nm over 15 min at a velocity of 50 mm/s. Flow pattern analysis revealed the formation of particle aggregation on the rolling path when lubricated with 0.1 wt% MoS2, which is associated with a tribofilm coverage rate of 41.5% on the contact area. However, an oil film thickness increase and particle aggregation were not observed during the tests with 0.1 wt% MoS2 blended with 3 wt% PIBS as the dispersant in PAO4 base oil, and for 0.75 wt% MoS2 in 0W20 engine oil. The results suggest that nanoparticles responsible for tribofilm formation originated from aggregates, but not the well-dispersed nanoparticles in point contact. This understanding should aid the advancement of novel lubricant additive design.

show abstract

Investigating the tribological and biological performance of covalently grafted chitosan coatings on Co–Cr–Mo alloy

Cited by 34 publications

References 36 publications

An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

Constructing a Dual-Function Surface by Microcasting and Nanospraying for Efficient Drag Reduction and Potential Antifouling Capabilities

Origin of the tribofilm from MoS2 nanoparticle oil additives: Dependence of oil film thickness on particle aggregation in rolling point contact

Contact Info

Product

Resources

About