Friction Control at The Molecular Level: From Superlubricity to Stick-Slip

Mazuyer, Denis; Tonck, A.; Cayer-Barrioz, Juliette

doi:10.1016/b978-044452772-1/50053-6

Cited by 9 publications

(56 citation statements)

References 49 publications

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“…Both surfaces are coated with a 50-nm thick metallic cobalt layer. Despite the presence of a 0.3-nm thick oxide layer, both surfaces are highly conductive and permit establishment of the displacement scale 0 using sphere/plane capacitive measurement as described in detail in [29].…”

Section: Methodsmentioning

confidence: 99%

“…The sphere is manufactured from a droplet of melted glass in order to perfectly control the radius over the whole surface of the probe [29]. Both surfaces are coated with a 50-nm thick metallic cobalt layer.…”

Section: Methodsmentioning

confidence: 99%

“…The SFA used in this study has been widely described in the literature [29,30]. The principle of the apparatus is schematically shown in Fig.…”

Section: The Sfamentioning

confidence: 99%

“…The resulting dynamic displacements and forces are measured with double-phase lock-in amplifiers giving the normal and tangential mechanical transfer functions of the interface between the sphere and the plane. From these signals, the elastic and viscous properties of the contact can be derived [29].…”

Section: The Sfamentioning

confidence: 99%

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Drainage of a Wetting Liquid: Effective Slippage or Polymer Depletion?

et al. 2008

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A surface force apparatus has been used to investigate the drainage of a viscosity improver lubricant. The characterization of the VI confined interface has been performed. Surprisingly, dynamical measurements enlighten a significant negative value of the immobile layer thickness. This result is discussed in terms of occurrence of slip at the wall, liquid-solid interface wettability, surface roughness and cleanliness, and friction experiments. Consequently, an interface molecular organization modelling is proposed based on polymer depletion near the solid-liquid interface.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The SFA used in this study has been widely described in the literature [29,30]. The principle of the apparatus is schematically shown in Fig.…”

Section: The Sfamentioning

confidence: 99%

Section: The Sfamentioning

confidence: 99%

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Drainage of a Wetting Liquid: Effective Slippage or Polymer Depletion?

et al. 2008

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“…With this device, simultaneous normal and tangential oscillating displacements at the picometer scale can also be used to get the rheological behavior of confined molecular films. 14,15 The oscillating displacement is performed by piezo-electric translators and the average film thickness is simultaneously measured using capacitive transducers. For high frequency reciprocating motion and higher contact pressure, shaker tribometers are commonly used in the field of fretting sliding (i.e., amplitudes of sliding lower or equal to the contact length) and reciprocal sliding (i.e., amplitudes of sliding generally much larger than the contact size).…”

Section: Introductionmentioning

confidence: 99%

Forced oscillations dynamic tribometer with real-time insights of lubricated interfaces

Yahiaoui

Rigaud

Mazuyer

et al. 2017

Review of Scientific Instruments

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This paper presents an innovative forced oscillations dynamic tribometer, the CHRONOS tribometer, with a lubricated ball-on-flat contact configuration fitted out with an in situ optical visualization system and a triggered high-speed camera. The CHRONOS tribometer generates controlled oscillating kinematics by means of a shaker with a range of strokes from 5 µm to 2.5 mm and an oscillation frequency which can be adjusted from 5 Hz to 250 Hz. Displacement and velocity are measured using a vibrometer. The ball-on-flat mean contact pressure is set between 200 MPa and 600 MPa. During motion, the instantaneous normal and friction forces and the interfacial film thickness distribution (in the nanometer scale) are simultaneously measured. In addition to this instantaneous approach, a more macroscopic approach is developed in terms of moving averages of friction and velocity. Another parameter, the friction-velocity tilt angle, is also introduced. This last parameter may give information on the friction-velocity dependence. Eventually, the experiments performed on the CHRONOS device lead to the representation of synchronized temporal signals of displacement/velocity, friction, and lubricant central film thickness. This superimposition of key parameters reveals time effects introduced by the periodical fluid squeeze and flow in the contact. Published by AIP Publishing.

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