Hydration lubrication

Klein, Jacob

doi:10.1007/s40544-013-0001-7

Cited by 460 publications

(444 citation statements)

References 117 publications

(116 reference statements)

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“…Phospholipids, bottle-brush glycoproteins, and linear polysaccharides have all been implicated, and the debate between scientists advocating different opinions 6,7 has at times been intense. It is nowadays clear that the key is the presence of a fluid water layer between the sliding surfaces that is maintained by the biolubricants, 8 and that synergies between different biolubricants need to be considered in order to capture the essence of biolubrication. For instance, it has been reported that addition of hyaluronan and phospholipids together is more effective in alleviating joint disease symptoms than any of these two components alone.…”

Section: Introductionmentioning

confidence: 99%

Synergies in lubrication

Dédinaité

Claesson

2017

Phys. Chem. Chem. Phys.

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To slide surfaces against each other with application of a minimum force and minimum wear has been important since ancient times, and it remains equally important today. The use of oil-soluble lubricants is widely spread in technology, whereas living organisms have developed water-soluble lubricants to facilitate sliding motions. In this perspective article we focus on water-based lubrication in the boundary lubrication regime, and particularly lubrication synergies. This focus has, of course, found inspiration from the outstanding lubrication properties of synovial joints. It has ignited significant amount of research, mostly aimed at answering the question: Which molecule is the magic biolubricant? Different research groups have advocated different answers, and the debate has been intensive. In this article we argue that the question in itself is inappropriate. The relevant question is rather the following: How do molecules work in synergy to provide superior lubrication?

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Section: Introductionmentioning

confidence: 99%

Synergies in lubrication

Dédinaité

Claesson

2017

Phys. Chem. Chem. Phys.

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“…Water lubricants have greater potential for achieving superlubricity because of their low pressure-viscosity coefficients [11]. Klein et al obtained superlubricity between two mica surfaces lubricated by a surfactant layer and charged polymers at a nano-scale using a surface force apparatus (SFA) [12][13][14]. Kato et al obtained superlubricity between two ceramic surfaces (Si 3 N 4 /CN x /SiC) with water lubrication at a macro-scale using a traditional tribometer [15,16].…”

Section: Introductionmentioning

confidence: 99%

Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

Zhang

Deng

et al. 2014

Friction

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Abstract:In this study, we address the superlubricity behavior of sapphire against ruby (or sapphire against itself) under phosphoric acid solution lubrication. An ultra-low friction coefficient of 0.004 was obtained under a very high contact pressure, with a virgin contact pressure up to 2.57 GPa. Related experiments have indicated that the load, sliding speed, and humidity of the test environment can affect superlubricity to some degree, so we tested variations in these conditions. When superlubricity appears in this study a thin film is present, consisting of a hydrogen bond network of phosphoric acid and water molecules adsorbed on the two friction surfaces, which accounts for the ultra-low friction. Most significantly, the wear rate of the sapphire and ruby in the friction process is very slow and the superlubricity state is very stable, providing favorable conditions for future technological applications.

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“…However, some of the basic properties of hydration lubrication, such as the frictional energy dissipation, remain unclarified despite decades of study. In all relevant studies to date, the measured friction was dominated by other dissipation pathways, such as polymer chains disentangling from each other or the distortion of sheared liposomes [23]. Recently, Klein's group overcame these limitations by trapping hydrated ions in the gap between molecularly smooth surfaces, and measuring the friction between the surfaces as they slid at pressures and shear rates one or two orders of magnitude higher than those previously achieved.…”

Section: Liquid Superlubricitymentioning

confidence: 99%

New achievements in superlubricity from international workshop on superlubricity: fundamental and applications

2015

Friction

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Since the term "superlubricity" was put forward at the beginning of 1990s, it has become one of the hottest researches in tribology due to it being close linked to the energy problems. Recently, the International Workshop on "Superlubricity: Fundamental and Applications" was successfully held on 19-20 October 2015 in Beijing, which has attracted many researchers in this field. The recent scientific results in both solid superlubricity and liquid superlubricity have been presented according to these invited wonderful lectures and posters. In the communication, we gave an introduction to the Workshop on Superlubricity, and also summarized the new achievements of superlubricity during recent years according to these reports. Finally, the problems of superlubricity mechanism and the future development direction of superlubricity are discussed.

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Hydration lubrication

Cited by 460 publications

References 117 publications

Synergies in lubrication

Synergies in lubrication

Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

New achievements in superlubricity from international workshop on superlubricity: fundamental and applications

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