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Berman, Arlene; Drummond, Carlos; Israelachvili, Jacob N.

doi:10.1023/a:1019103205079

Cited by 145 publications

(92 citation statements)

References 13 publications

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“…Thus we obtain a very good agreement with experiments on the viscosity of water film confined between two mica plates with a thickness about 1-2 molecular layers, where the values within a factor of 3 or so of the viscosity of bulk water were observed [19]. The values of the coefficient of friction l ¼ f=f l $ 0:01 that we obtained in simulations at high loads, also lie in the range of experimentally observed values [21].…”

Section: Static and Kinetic Friction Forcessupporting

confidence: 89%

The friction properties of an ultrathin confined water film

2006

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An ultrathin water film confined between two substrates in moving contact is studied using Langevin molecular dynamics with coordinate-and velocity-dependent damping coefficient. The correlations between the structure of the water lubricant film and its frictional properties are found in a wide range of applied loads and for various strengths of interactions between water and surfaces. A self-organization of the film into a low-friction state under driving is observed to occur. Surprisingly, it is found that the ''hydrophilic'' surfaces exhibit a lower friction than the ''hydrophobic'' ones. The viscosity of the confined water estimated from the simulations is in a good agreement with the experimental value.

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Section: Static and Kinetic Friction Forcessupporting

confidence: 89%

The friction properties of an ultrathin confined water film

2006

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“…This dependence of friction on the true contact area was confirmed in previous LFM and SFA experiments on atomically smooth and chemically interacting surfaces [23]. On the other hand if the surfaces are atomically smooth (θ = 0) and inert (τ 0 = 0), the friction force is:…”

Section: Geometrical Fluctuationssupporting

confidence: 76%

Friction from nano to macroforce scales analyzed by single and multiple-asperity contact approaches

Achanta

Drees²,

Celis

2008

Surface and Coatings Technology

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“…7 as a function of load at different temperatures. In all cases the friction force is very low, and we analyze the data using Amontons' rule [47,48] that states that the friction force, F f , is proportional to the load, F n , with the proportionality constant being known as the friction coefficient, l:…”

Section: Friction Forcesmentioning

confidence: 99%

The effect of temperature on supported dipalmitoylphosphatidylcholine (DPPC) bilayers: Structure and lubrication performance

Wang

Zander

Liu

et al. 2015

Journal of Colloid and Interface Science

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Phospholipids fulfill an important role in joint lubrication. They, together with hyaluronan and glycoproteins, are the biolubricants that sustain low friction between cartilage surfaces bathed in synovial fluid. In this work we have investigated how the friction force and load bearing capacity of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) bilayers on silica surfaces are affected by temperature, covering the temperature range 25-52°C. Friction forces have been determined utilizing the AFM colloidal probe technique, which showed that DPPC bilayers are able to provide low friction forces over the whole temperature interval. However, the load bearing capacity is improved at higher temperatures. We interpret this finding as being a consequence of lower rigidity and higher self-healing capacity of the DPPC bilayer in the liquid disordered state compared to the gel state. The corresponding structure of solid supported DPPC bilayers at the silica-liquid interface has been followed using X-ray reflectivity measurements, which suggests that the DPPC bilayer is in the gel phase at 25°C and 39°C and in the liquid disordered state at 55°C. Well-defined bilayer structures were observed for both phases. The deposited DPPC bilayers were also imaged using AFM PeakForce Tapping mode, and these measurements indicated a less homogeneous layer at temperatures below 37°C.

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Untitled

Cited by 145 publications

References 13 publications

The friction properties of an ultrathin confined water film

The friction properties of an ultrathin confined water film

Friction from nano to macroforce scales analyzed by single and multiple-asperity contact approaches

The effect of temperature on supported dipalmitoylphosphatidylcholine (DPPC) bilayers: Structure and lubrication performance

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