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Lubricants
Special Issues
Synthetic Greases and Oils
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Synthetic Greases and Oils

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 30 September 2025 | Viewed by 1491

Special Issue Editors

Prof. Dr. Renguo Lu

E-Mail Website
Guest Editor
Faculty of Engineering Science, Kansai University, Osaka 564-8680, Japan
Interests: tribochemistry; synthetic lubricants; additives; tribotronics; surface coating; boundary lubrication; solid lubrication; in situ analysis
Dr. Koji Takiwatari

E-Mail Website
Guest Editor
National Institute of Technology, Ichinoseki College, Ichinoseki-shi 021-8511, Japan
Interests: lubricant; additive; grease; gel; In-situ observation; nascent surface

Special Issue Information

Dear Colleagues,

In recent years, amidst the expanding diversification and technological refinement across industrial domains, a notable demand for enhanced performance has emerged, extending beyond mere machinery to encompass lubricants engineered to mitigate friction and wear. Furthermore, in the pursuit of mitigating global warming and achieving a sustainable societal framework, the prerequisites for lubricants have been heightened, emphasizing energy conservation, resource efficiency, and longevity. Simultaneously, efforts are underway to address environmental contamination through the reduction of exhaust emissions, enhancement of biodegradability, and regulation of hazardous substance usage.

This Special Issue dedicated to synthetic greases and oils aims to elucidate prevailing trends and advancements in this domain, tailored to meet the escalating demands driven by the multifaceted expansion and technological sophistication within industrial sectors. This Special Issue seeks to delve into state-of-the-art research and innovations relevant to lubrication technology, covering topics such as the development of high-performance synthetic lubricants, advanced analytical methods, strategies for energy conservation and resource optimization, and initiatives aimed at environmental sustainability.

By showcasing cutting-edge research, this Special Issue will provide a comprehensive exposition of advancements in synthetic greases and oils, thereby fostering discourse and collaboration among researchers, industry practitioners, and policymakers toward sustainable technological solutions.

Prof. Dr. Renguo Lu
Dr. Koji Takiwatari
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • synthetic lubricant
  • grease
  • oil
  • high performance
  • fluid structure interaction
  • friction and wear
  • lubrication
  • rheology
  • tribochemistry
  • adsorption
  • surface anylysis

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Published Papers (2 papers)

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Research

24 pages, 12513 KiB  
Article
Effect of Applied Current on Tribological Properties of Polyphenyl Ether
by Chencheng Wu, Renguo Lu, Hiroshi Tani, Shinji Koganezawa, Xujun Liu and Peihong Cong
Lubricants 2025, 13(4), 173; https://doi.org/10.3390/lubricants13040173 - 9 Apr 2025
Viewed by 478
Abstract
The widespread adoption of electric vehicles (EVs) has introduced new challenges in drivetrain lubrication, particularly concerning electrical corrosion, frictional wear, and hydrogen embrittlement. While polyalphaolefin (PAO)-based lubricants are commonly used, they struggle under high-speed and high-torque conditions. In contrast, polyphenyl ether (PPE)-based lubricants [...] Read more.
The widespread adoption of electric vehicles (EVs) has introduced new challenges in drivetrain lubrication, particularly concerning electrical corrosion, frictional wear, and hydrogen embrittlement. While polyalphaolefin (PAO)-based lubricants are commonly used, they struggle under high-speed and high-torque conditions. In contrast, polyphenyl ether (PPE)-based lubricants offer superior wear resistance and effectively suppress hydrogen generation, making them promising for EV applications. This study examines the effects of current direction and magnitude on tribofilm formation and frictional behavior in a PPE-lubricated environment. The results show that PPE exhibits unique tribofilm adhesion characteristics influenced by electrical conditions, unlike PAO. Surface analysis reveals that the tribofilm mainly consists of amorphous carbon, and friction under an electrical bias induces PPE oxidation, with oxidation products forming more readily at the positive electrode. Tribofilm formation correlated with increased friction and wear, particularly under currents of 10 mA or higher. Although PPE is more sensitive to electrical influences than PAO, it exhibits excellent wear resistance and maintains a low coefficient of friction even under electrification. This suggests that PPE could be suitable for lubrication in electrical environments and may serve as a promising lubricant for EV drive systems and similar applications. Full article
(This article belongs to the Special Issue Synthetic Greases and Oils)
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8 pages, 3611 KiB  
Article
Some Considerations to the Energy Dissipation of Frictionally Stressed Lubricating Greases
by Erik Kuhn
Lubricants 2025, 13(2), 86; https://doi.org/10.3390/lubricants13020086 - 16 Feb 2025
Viewed by 547
Abstract
The introduction of mechanical energy during a friction process stimulates the system to eliminate this disturbance and find ways for energy dissipation. There are two principal situations: the system is either near equilibrium or far from equilibrium. Near equilibrium, it can be expected [...] Read more.
The introduction of mechanical energy during a friction process stimulates the system to eliminate this disturbance and find ways for energy dissipation. There are two principal situations: the system is either near equilibrium or far from equilibrium. Near equilibrium, it can be expected that the disturbance will be damped after a certain time, and the system will settle in a stationary state at a level where it began. However, the situation could be entirely different when the system is far from equilibrium. After a phase of instability and crossing a critical parameter, there is a probability of a change in the order level. This means that a new structure will be formed. This paper describes some aspects of the criteria that lead a friction process inside the grease film to instability and examines the influence of different dependencies. In this publication, the dependencies are extended to verify the stability criterion. Finally, the rest phase of a thixotropic experiment is examined from the perspective of potential instability and, thus, the possibility of self-organizing processes occurring. Full article
(This article belongs to the Special Issue Synthetic Greases and Oils)
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