Shear-Induced Interfacial Structural Conversion Triggers Macroscale Superlubricity: From Black Phosphorus Nanoflakes to Phosphorus Oxide

Liu, Yanfei; Li, Jianfeng; Yi, Shuang; Ge, Xiangyu; Zhang, Xin; Luo, Jianbin

doi:10.1021/acsami.1c04664

Cited by 45 publications

(26 citation statements)

References 44 publications

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“…As shown in Figure a, there are three separate peaks in the O 1s spectrum, which prove the existence of the C–O bond (531.55 eV), Si–O or P–O bond (531.08 eV) and PO bond (529.91 eV) on the glass surface. , Among them, the C–O bond, P–O bond, and PO bond come from the PEG or PA molecules in the lubricant, which reflects that the chemical molecules in the lubricant may be adsorbed on the surface of the friction pair. Moreover, the C–O bond (286.6 eV) and C–C/C–H bond (284.8 eV) in the C 1s spectrum and the PO bond (133.2 eV) and the P–O bond (132.2 eV) in the P 2p spectrum can further prove the existence of PEG–PA lubricant in the contact area of the glass sheet (see Figures b and c) . Only the Si–O bond at 101.6 eV exists in the Si 2p spectrum (Figure d).…”

Section: Resultsmentioning

confidence: 79%

Macroscale Superlubricity with Ultralow Wear and Ultrashort Running-In Period (∼1 s) through Phytic Acid-Based Complex Green Liquid Lubricants

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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Liquid superlubricity has attracted much attention, due to its ability to significantly reduce friction on the macroscale. However, the severe wear caused by the long running-in period is still one of the bottlenecks restricting the practical application of liquid superlubricating materials. In this work, the obtained polyethylene glycol–phytic acid (PEG–PA) composite liquid lubricants showed outstanding superlubricating properties (μ ≈ 0.006) for Si3N4/glass friction pairs with an ultrashort running-in period (∼1 s) under high Hertzian contact pressure of ∼758 MPa. More importantly, even after up to 12 h (∼700 m of travel), only about 100 nm deep wear scars were found on the surface of the glass sheet (wear rate = 2.51× 10–9 mm3 N–1 m–1). From the molecular point of view, the water molecules anchored between the two friction pairs have extremely low shear force during the friction process, and the strong hydrogen bond interaction between PEG and PA greatly improves the bearing capacity of the lubricant. This work addresses the challenge of liquid superlubricant simultaneously exhibiting low shear force and high load-carrying capacity and makes it possible to obtain liquid superlubrication performance with an extremely short running-in time.

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Section: Resultsmentioning

confidence: 79%

Macroscale Superlubricity with Ultralow Wear and Ultrashort Running-In Period (∼1 s) through Phytic Acid-Based Complex Green Liquid Lubricants

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Nepenthes rivet a lot of liquid on the surface through the surface structure, and this slippery liquid-lubricated surface is suitable for dust proofing and catching bugs (Figure 5e) [116,117]. This liquid film has been proven effective in reducing friction [118,119] droplets and surfaces. Even in cold environments, SLIPS-TENG could still be effectively separated from the water droplets instead of superhydrophobic surface-based TENG (SHS-TENG) (Figure 5g).…”

Section: Bio-inspired Rainwater-driven Electricity Generatormentioning

confidence: 99%

Bio-inspired water-driven electricity generators: From fundamental mechanisms to practical applications

Wang¹,

Xu²,

Zhang³

et al. 2023

Nano Research Energy

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Harvesting water energy in various forms of water motion, such as evaporation, raindrops, river flows, ocean waves, and other, is promising to relieve the global energy crisis and reach the aim of carbon neutrality. However, this highly decentralized and distributed water energy poses a challenge on conventional electromagnetic hydropower technologies that feature centralization and scalization.Recently, this problem has been gradually addressed by the emergence of a myriad of electricity generators that take inspiration from natural living organisms, which have the capability to efficiently process and manage water and energy for survival in the natural competition. Imitating the liquid-solid behaviors manifested in ubiquitous biological processes, these generators allow for the efficient energy conversion from water-solid interaction into the charge transfer or electrical output under natural driving, such as gravity and solar power. However, in spite of the rapid development of the field, a fundamental understanding of these generators and their ability to bridge the gap between the fundamentals and the practical applications remains elusive. In this review, we first introduce the latest progress in the fundamental understanding in bio-inspired electricity generators that allow for efficient harvesting water energy in various forms, ranging from water evaporation, droplet to wave or flow, and then summarize the development of the engineering design of the various bio-inspired electricity generator in the practical applications, including self-powered sensor and wearable electronics. Finally, the prospects and urgent problems, such as how to achieve large-scale electricity generation, are presented.

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“…While these concepts are prevalent in literature, there are some studies that claimed that superlubricity is derived from the rolling effect of BP and their structural conversion to phosphorus oxide. The degradation and tribochemical transformation of BP eventually lead to the formation of an extremely low shear strength tribofilm that reduces the friction coefficient significantly (Ren et al, 2020;Liu et al, 2021).…”

Section: Black Phosphorusmentioning

confidence: 99%

Progress in Superlubricity Across Different Media and Material Systems—A Review

et al. 2022

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Superlubricity is a terminology often used to describe a sliding regime in which the adhesion leading to friction or resistance to sliding literally vanishes. For improved energy security, environmental sustainability, and a decarbonized economy, achieving superlubric sliding surfaces in moving mechanical systems sounds very exciting, since friction adversely impacts the efficiency, durability, and environmental compatibility of many moving mechanical systems used in industrial sectors. Accordingly, scientists and engineers have been exploring new ways to achieve macroscale superlubricity through the use of advanced materials, coatings, and lubricants for many years. As a result of such concerted efforts, recent developments indicate that with the use of the right kinds of solids, liquids, and gases on or in the vicinity of sliding contact interfaces, one can indeed achieve friction coefficients well below 0.01. The friction coefficient below this threshold is commonly termed the superlubric sliding regime. Hopefully, these developments will foster further research in the field of superlubricity and will ultimately give rise to the industrial scale realization of nearly-frictionless mechanical systems consuming far less energy and causing much-reduced greenhouse gas emissions. This will ultimately have a substantial positive impact on the realization of economically and environmentally viable industrial practices supporting a decarbonized energy future. In this paper, we will provide an overview of recent progress in superlubricity research involving solid, liquid, and gaseous media and discuss the prospects for achieving superlubricity in engineering applications leading to greater efficiency, durability, environmental quality, and hence global sustainability.

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Shear-Induced Interfacial Structural Conversion Triggers Macroscale Superlubricity: From Black Phosphorus Nanoflakes to Phosphorus Oxide

Cited by 45 publications

References 44 publications

Macroscale Superlubricity with Ultralow Wear and Ultrashort Running-In Period (∼1 s) through Phytic Acid-Based Complex Green Liquid Lubricants

Macroscale Superlubricity with Ultralow Wear and Ultrashort Running-In Period (∼1 s) through Phytic Acid-Based Complex Green Liquid Lubricants

Bio-inspired water-driven electricity generators: From fundamental mechanisms to practical applications

Progress in Superlubricity Across Different Media and Material Systems—A Review

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