Comparison study on surface and thermo-chemical properties of PFPE lubricants on DLC film through MD simulations

Song, Jingan; Talukder, Sujoy; Rahman, Shahriar Mufid; Jung, Young‐Chul; Yeo, Chang Dong

doi:10.1016/j.triboint.2020.106835

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…The backbones and functional end groups of the PFPE lubricant molecules both contribute to the enhancement of the load capacity and tribological performance. The functional end groups of the PFPE lubricant molecules are bonded/anchored to the rough solid surface, preventing direct solid-to-solid contacts . With a layer of PFPE molecules anchored on the surface, the abrasion process removes only the top mobile layer of the PFPE lubricant.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The functional end groups of the PFPE lubricant molecules are bonded/anchored to the rough solid surface, preventing direct solid-to-solid contacts. 43 With a layer of PFPE molecules anchored on the surface, the abrasion process removes only the top mobile layer of the PFPE lubricant. The backbones with higher mobility enable easier shear and lower friction during a light-load interfacial contact.…”

Section: Corrosion Resistance Andmentioning

confidence: 99%

See 1 more Smart Citation

Comparison Study of Self-Cleaning, Anti-Icing, and Durable Corrosion Resistance of Superhydrophobic and Lubricant-Infused Ultraslippery Surfaces

Zhang

Xia

et al. 2021

Langmuir

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Endowing metallic surfaces with special wettability and unique interfacial contacts broadens their wide application fields. Herein, superhydrophobic and lubricant-infused ultraslippery surfaces were achieved through chemical etching, low surface energy molecule grafting, and lubricant infusion. Systematic comparison studies of the surface wettability, self-cleaning, anti-icing, anticorrosion behaviors, and mechanical durability were carried out to reveal the functional differences and mechanisms. Both superhydrophobic and ultraslippery surfaces exhibit a distinct decrease in ice adhesion strength and a remarkable increase in charge-transfer resistance, demonstrating significantly improved ice overdelay and corrosion-resisting performance. Most notably, given the existence of a stable, defect-free, and inert lubricant-infused layer, the lubricant-infused ultraslippery surfaces possess superior mechanical robustness and long-term corrosion resistance, which provides better application potential under challenging service environments.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Corrosion Resistance Andmentioning

confidence: 99%

Comparison Study of Self-Cleaning, Anti-Icing, and Durable Corrosion Resistance of Superhydrophobic and Lubricant-Infused Ultraslippery Surfaces

Zhang

Xia

et al. 2021

Langmuir

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“…Ztetraol and Ztetraol multidentate (ZTMD) were prepared using Materials Studio and Avogadro [39]. Based on previous studies [21,40,41], the chemical structures for Ztetraol and ZTMD were chosen, as shown in Figure 1. Both PFPE lubricants were optimized by using the NWChem computational chemistry package [42] with the B3LYP functional approximation [43], Mulliken population for electronic charge distribution [44], and the STO-3G minimal basis set due to its computational cost [45,46].…”

Section: Lubricant Preparationmentioning

confidence: 99%

Mechano-Chemical Properties and Tribological Performance of Thin Perfluoropolyether (PFPE) Lubricant Film under Environmental Contaminants

Jung

Yeo

2023

Lubricants

Self Cite

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Through molecular dynamics (MD) simulations with ReaxFF potential, the effects of chemical contaminants on the mechano-chemical properties and tribological performance of perfluoropolyether (PFPE) lubricants were investigated. For the two types of contaminants, i.e., silicon dioxide (SiO2) nanoparticles and water (H2O), their molecular interactions with the two different PFPE lubricants, i.e., Ztetraol and ZTMD, were evaluated at the two different temperatures, i.e., 300 K and 700 K. Contaminants were adsorbed onto the PFPE lubricants at a controlled temperature. Then, air shear simulations were conducted to examine the mechano-chemical behaviors of the contaminated lubricants. Sliding contact simulations were performed to further investigate the tribological performance of the contaminated lubricants, from which the resulting friction and surface contamination were quantified. Lastly, chemical reactions between PFPE lubricants and contaminants were studied to investigate the degradation of PFPE lubricants. It was observed that SiO2 nanoparticles stiffened the PFPE lubricant, which decreased its shear displacement and increased friction. In the case of the H2O contaminant, it weakened and decreased the PFPE lubricant’s viscosity, increasing its shear displacement and lowering friction. However, the decreased viscosity by H2O contaminants can weaken the lubricity of the PFPE lubricant, leading to a higher chance of direct solid-to-solid contact under high contact force conditions.

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“…Liu et al [25] conducted molecular dynamics simulations to analyze the conformational changes and energy transfer of lubricants, studying the lubrication behavior under different pressure loads. Song et al [26] performed molecular dynamics simulations using four types of PFPE lubricants to study their spreading behavior, air shear behavior, surface contamination, and friction. Tang et al [27] conducted a study using a molecular dynamics model to investigate the effects of contact force, disk velocity, and air-bearing pressure on the penetration depth of the slider and lubricant depletion in the head-disk interface.…”

Section: Introductionmentioning

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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Comparison study on surface and thermo-chemical properties of PFPE lubricants on DLC film through MD simulations

Cited by 7 publications

References 49 publications

Comparison Study of Self-Cleaning, Anti-Icing, and Durable Corrosion Resistance of Superhydrophobic and Lubricant-Infused Ultraslippery Surfaces

Comparison Study of Self-Cleaning, Anti-Icing, and Durable Corrosion Resistance of Superhydrophobic and Lubricant-Infused Ultraslippery Surfaces

Mechano-Chemical Properties and Tribological Performance of Thin Perfluoropolyether (PFPE) Lubricant Film under Environmental Contaminants

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

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