Unraveling the friction response from selective hydrogenation of textured amorphous carbon surface

Du, Naizhou; Wei, Xianzhe; Li, Xiaowei; Chen, Zan; Lu, Shiqi; Ding, Jiaqing; Feng, Cunao; Chen, Kai; Qiao, Jianghao; Zhang, Dekun; Lee, Kwang-Ryeol

doi:10.1016/j.apsusc.2022.156246

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…As shown in Figure S8 of Supporting Information, a small number of H atoms underwent desorption during sliding, and some of these free H atoms bonded with intrinsic a-C. This differed from the results of previous study in which none of the oil molecules underwent dehydrogenation and the dissociation of the C 24 H 50 molecules occurred on the C–C backbone of the chain rather than on the C–H bonds. The broken C–C bonds in the oil molecules combined with a-C bonds to form hydrocarbons.…”

Section: Results and Discussioncontrasting

confidence: 83%

“…As shown in Figure S8 of Supporting Information, a small number of H atoms underwent desorption during sliding, 48 and some of these free H atoms bonded with intrinsic a-C. This differed from the results of previous study 33 The quantity of dissociated lubricant molecules had a positive correlation with the contact pressure. The breakage of C 24 H 50 molecules predominantly occurred during the first and second stages of the sliding process (Figure 2a).…”

Section: Resultscontrasting

confidence: 77%

“…According to the classical Stribeck curve theory, the oil content and contact pressure determine the interfacial lubrication state, which affects the friction coefficient . However, the inherent complex structure of a-C films, along with the introduction of a lubricant and texturing, which increases the complexity of the interface, makes it difficult to characterize the spatial structure of the sliding interface from a macroscopic experimental perspective. , The influence mechanism of the lubricant flow behavior and the interaction between intrinsic C atoms on the sliding interface require further investigation. These are prerequisites for providing reliable explanations for the low friction coefficient of a-C films in experiments and for promoting the application of a-C under multiple working conditions.…”

Section: Introductionmentioning

confidence: 99%

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Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Du,

Li,

Wei

et al. 2023

ACS Appl. Mater. Interfaces

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The combination of fluid lubricants and textured amorphous carbon (a-C) can provide an ultralow friction state, which can improve the reliability and service life of dynamic machinery. However, the coupling effects of the contact pressure and oil content on the friction-reducing efficiency is still lack of study, and the corresponding friction mechanism is also not fully understood, which cannot be achieved by experiment due to the limitation of in situ characterization. In this study, using the reactive molecular dynamics simulation, the insight into the evolution of interfacial structures induced by both contact pressures and oil contents on a-C surface was systematically investigated to explore the fundamental mechanism. In particular, the friction difference between textured and untextured a-C films was evaluated comparatively. Results indicate that the tribological performance strongly depends on the interfacial lubrication state, which is jointly determined by the oil content and contact pressure; the best operating condition to achieve ultralow friction coefficient (0.002) is obtained, and the evolution of friction coefficient with oil content and contact pressure is highly dominated by the lubricant mobility, cross-linking between mating a-C surfaces, or competition/synergy of the H stress state from the lubricant with interfacial passivation. Furthermore, the difference in friction reduction between textured and untextured systems is unveiled; with the increase of contact pressure, the role of texturing a-C surface in antifriction changes from positive to negative effect, which is related to the transformation of interfacial hybridized structure and anomalous flow of lubricant. These results can significantly enhance the understanding of composite lubrication systems through computation and also provide a roadmap for the R&D of the advanced lubrication system according to the working conditions.

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Section: Results and Discussioncontrasting

confidence: 83%

Section: Resultscontrasting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Du,

Li,

Wei

et al. 2023

ACS Appl. Mater. Interfaces

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Friction reactions induced by selective hydrogenation of textured surface under lubricant conditions

Wei

et al. 2023

Friction

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The passivation of hydrogen atoms and the conformation of textured surfaces under oil-lubricated conditions are effective strategies to obtain amorphous carbon (a-C) films with extremely low friction. It is critical to understanding the influence mechanism of selective surface hydrogenation on the tribological behaviors of textured a-C film under oil-lubricated conditions. In particular, the interactions of hydrogen atoms and lubricants are confusing, which is enslaved to the in situ characterization technique. The reactive molecular dynamics (RMD) simulations were conducted to analyze the friction response of textured a-C films with selective hydrogenation surfaces under oil-lubricated conditions. The results indicate that the existence of hydrogen atoms on specific bump sites significantly decreases the friction coefficient (μ) of textured a-C film, which is highly dependent on the surface hydrogen content. The repulsion between hydrogen atoms and lubricant molecules prompts the formation of a dense lubricant film on the surface of the mating material. Interestingly, with the enhancement of the surface hydrogen content, the passivation of the friction interface and the repulsion between hydrogen atoms and lubricants play dominant roles in reducing the friction coefficient instead of hydrodynamic lubrication.

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Atomic effect and mechanism of different hydrogen content on superlubricity properties of H-DLC films

Liu,

He,

Liu

2025

Applied Surface Science

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Unraveling the friction response from selective hydrogenation of textured amorphous carbon surface

Cited by 7 publications

References 38 publications

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Friction reactions induced by selective hydrogenation of textured surface under lubricant conditions

Atomic effect and mechanism of different hydrogen content on superlubricity properties of H-DLC films

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