The effect of protein adsorption on the friction behavior of ultra-high molecular weight polyethylene

Karuppiah, K. S. Kanaga; Sundararajan, Sriram; Xu, Zhi-Hui; Li, Xiaodong

doi:10.1007/s11249-006-9078-8

Cited by 42 publications

(21 citation statements)

References 43 publications

(45 reference statements)

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“…This expectation is strengthened by our own previous results for surface textured ceramic-steel contacts [41]. As this study was performed with isooctane instead of PAO, elucidating how lubricants with different viscosities and molecular weights [42] influence the optimum texturing parameters is part of our ongoing research efforts. A laser texturing parameter that will be systematically studied in the future is the cross-sectional profile of the dimples.…”

Section: Discussionmentioning

confidence: 62%

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

2017

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Abstract:Unidirectional sliding experiments with polished and laser textured steel surfaces were carried out to investigate the effects of different textured area densities, aspect ratios and dimple arrangements. The system was lubricated with Polyalphaolefin (PAO) at 100 °C and the contact pressure was 3 MPa. For measuring Stribeck curves, the sliding speed was controlled between 40 and 2000 mm/s. The textured area density was varied between 5% and 30%, with the lowest friction values found for 10%. Aspect ratios ranging from 0.02 to 0.2 were investigated and for 0.1 the lowest friction values were measured. The dimple arrangements tested were cubic, hexagonal and a random distribution for a textured area density of 10% and an aspect ratio of 0.1. Our results demonstrate that the dimple arrangement does affect friction values, hinting to the fact that individual texture elements do influence each other. The optimum dimple arrangement was found in a hexagonal packing. This systematic variation of these three key texturing parameters for the morphological texturing of a tribological surface with dimples will allow a strategic choice of texturing parameters. This makes the most of the tremendous potential that laser surface texturing has for reducing friction forces and thereby CO2 emissions.

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Section: Discussionmentioning

confidence: 62%

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

2017

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“…Karuppiah et al also found an increase in boundary friction as function of protein concentration. 21 However, they report, using the same surface as Widmer et al 24 a higher friction on hydrophilic UHMWPE (ultrahigh molecular weight polyethylene used in total joint replacements) surfaces instead of on hydrophobic UHMWPE. Our friction experiments confirm the observed higher friction as function of protein concentration (Fig.…”

Section: Discussionmentioning

confidence: 93%

“…On the other hand, the boundary/mixed regimes are often crucial in the field of bio-lubrication, e.g., in joint and prosthetic material lubrication. [19][20][21][22][23][24] Below, we discuss some of the relevant papers from the areas of hydrodynamic emulsion lubrication and bio-lubrication, and relate them to the work presented here.…”

Section: Discussionmentioning

confidence: 99%

Tribology of o/w Emulsions Under Mouth-like Conditions: Determinants of Friction

et al. 2007

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Fat-perception is thought to be related to a complex interplay between fat-associated flavor release and mouth-feel. Friction sensed between the tongue and the palate seems to play a prominent role: in previous work, we have shown that emulsions that are more sensitive toward coalescence give rise to a lowering of the orally perceived and experimentally measured friction and, probably as a consequence, to an enhanced fat-perception. In this paper, we study in detail the factors determining friction of protein-stabilized emulsions using a novel mouth-mimicking tribometer and model surfaces consisting of PDMS modified in various ways (hydrophobicity, deformability, roughness). We show that unlike in many technological applications where lubrication is essentially hydrodynamic, for physiologically relevant loads, the modified PDMS is boundary and/or mixed lubricated, which is like in-mouth lubrication. We find that an increased sensitivity of the emulsions toward coalescence results in a lower friction, confirming previous results obtained with pig's tongue. Surface-induced coalescence (or spreading of emulsion droplets) seems to be very important in this, surface hydrophobicity being the dominant trigger. Viscosity of the dispersed phase does not have such a strong influence on both the measured friction and the oral perceived friction. We do find a strong influence of the presence of bulk proteins and saliva on friction. Finally, hardly any dependence of measured friction on fat content of the emulsion was observed, indicating that only a small amount of fat is needed to alter the friction.

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“…29 It has been postulated that the formation of thick, multilayer protein films plays an important role in determining the friction coefficient of artificial hip implants. 8,12,23,[30][31][32][33] Albumin is sensitive to many factors including heat, protein concentration, salt concentration, and pH, and aggregates through hydrophobic interactions in solution over time to form solid, insoluble particles. 34,35 These particles are then deposited on the surface.…”

Section: Discussionmentioning

confidence: 99%

Friction, lubrication, and polymer transfer between UHMWPE and CoCrMo hip‐implant materials: A fluorescence microscopy study

Crockett¹,

Roba²,

Naka³

et al. 2008

J Biomedical Materials Res

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The friction coefficients of CoCrMo sliding against UHMWPE and CoCrMo were measured in solutions of albumin and synovial fluid containing fluorescently labeled albumin. No fluorescence could be observed on the CoCrMo disc following incubation in labeled albumin or after sliding against CoCrMo. This was due to quenching of the fluorophore by the metal and indicated that a protein film thicker than 10 nm was not formed on the surface. A more complicated behavior was observed for UHMWPE sliding against CoCrMo. For each lubricating solution and at each load, a bimodal distribution of steady-state friction values was observed, the friction coefficient either remaining constant or decreasing during the early stages of the measurement. As no quenching of the fluorophores occurred on the UHMWPE surface, the fluorescence labeling method could be used to reveal polyethylene (PE) transfer and to show that it correlates with the friction coefficient: Low friction coefficients corresponded to a low density of PE spots on the CoCrMo surface. In addition, it was found that the friction coefficients for UHMWPE sliding against CoCrMo in synovial fluid were not significantly different from those in phosphate-buffered saline (PBS), but that the addition of albumin to PBS did cause a significant increase in the friction coefficient.

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The effect of protein adsorption on the friction behavior of ultra-high molecular weight polyethylene

Cited by 42 publications

References 43 publications

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

Tribology of o/w Emulsions Under Mouth-like Conditions: Determinants of Friction

Friction, lubrication, and polymer transfer between UHMWPE and CoCrMo hip‐implant materials: A fluorescence microscopy study

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