Effect of Lubricant Fragments on Lubricant Transfer: A Molecular Dynamics Simulation

Pan, Deng; Ovcharenko, Andrey; Peng, Jiayu; Jiang, Hongyuan

doi:10.1109/tmag.2014.2313316

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…With the increase of the temperature, the rate of thermal decomposition of perfluorodimethyl ether increases [46]. A modified coarse-grained, bead spring model was used to investigate the effect of lubricant fragments on lubricant transfer from a rotating disk to a slider [47]. The simulation results indicate that full lubricant molecules cannot transfer to the slider surface for large enough slider to disk spacing [47].…”

Section: Introductionmentioning

confidence: 99%

“…A modified coarse-grained, bead spring model was used to investigate the effect of lubricant fragments on lubricant transfer from a rotating disk to a slider [47]. The simulation results indicate that full lubricant molecules cannot transfer to the slider surface for large enough slider to disk spacing [47]. To investigate the failure of poly(dimethylsiloxane) polymer (PDMS) at high temperatures and pressures and in the presence of various additives, Chenoweth et al [48] expanded the ReaxFF reactive force field to describe carbonsilicon systems.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation

Nath

Wong

2014

Journal of Nanotechnology

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Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the hard disk interface and the head during the movement of head during reading and writing data in the hard disk. Due to temperature rise of PFPE Zdol lubricant molecules on a DLC surface, how polar end groups are detached from lubricant molecules during coating is described considering the effect of temperatures on the bond/break density of PFPE Zdol using the coarse-grained bead spring model based on finitely extensible nonlinear elastic potential. As PFPE Z contains no polar end groups, effects of temperature on the bond/break density (number of broken bonds/total number of bonds) are not so significant like PFPE Zdol. Effects of temperature on the bond/break density of PFPE Z on DLC surface are also discussed with the help of graphical results. How bond/break phenomenonaffects the end bead density of PFPE Z and PFPE Zdol on DLC surface is discussed elaborately. How the overall bond length of PFPE Zdol increases with the increase of temperature which is responsible for its decomposition is discussed with the help of graphical results. At HAMR condition, as PFPE Z and PFPE Zdol are not suitable lubricant on a hard disk surface, it needs more investigations to obtain suitable lubricant. We study the effect of breaking of bonds of nonfunctional lubricant PFPE Z, functional lubricants such as PFPE Zdol and PFPE Ztetrao, and multidented functional lubricants such as ARJ-DS, ARJ-DD, and OHJ-DS on a DLC substrate with the increase of temperature when heating of all of the lubricants on a DLC substrate is carried out isothermally using the coarse-grained bead spring model by molecular dynamics simulations and suitable lubricant is selected which is suitable on a DLC substrate at high temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation

Nath

Wong

2014

Journal of Nanotechnology

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“…In order to achieve a uniform and random distribution of lubricant molecules on the DLC overcoat, the distribution was simulated in two stages [17,18,35].…”

Section: Simulation Methodsmentioning

confidence: 99%

The Effect of Slider Configuration on Lubricant Depletion at the Slider/Disk Contact Interface

Chen,

Zhou,

Tang

2024

Lubricants

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With decreasing clearance between the protrusion of a slider and a disk interface, there is a higher likelihood of contact occurring during shock or vibration experienced by hard disk drives (HDDs), which may induce lubricant depletion. Based on the molecular dynamics (MD) model of perfluoropolyether lubricant with a coarse-grained beads spring approach, we compared the slider configurations’ influence on the lubricant transfer volume quantitatively. By further investigating the parameters of the cylindrical asperities, including the width and depth, as well as considering the asperity amounts of the slider, we successfully observed the lubricant depletion process during slider and disk contact. The results demonstrate that the penetration depth was reduced as the asperity amount increased, mainly owing to the increased contact area between the surfaces. The decreasing depth of the asperity and the increasing width of the asperity helped to reduce the depletion volume. In addition, the utilization of a cylindrical slider configuration can contribute to a reduction in lubricant depletion resulting from contact between the head and disk.

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Investigation of lubricant depletion under a continuous heat source using molecular dynamics simulation

et al. 2018

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Effect of Lubricant Fragments on Lubricant Transfer: A Molecular Dynamics Simulation

Cited by 5 publications

References 29 publications

Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation

Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation

The Effect of Slider Configuration on Lubricant Depletion at the Slider/Disk Contact Interface

Investigation of lubricant depletion under a continuous heat source using molecular dynamics simulation

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