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Lubricants
Special Issues
Eco-Friendly Lubricating Additives
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Eco-Friendly Lubricating Additives

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

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 4004

Special Issue Editors

Prof. Dr. Ke Li

E-Mail Website
Guest Editor
School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China
Interests: oil-based superlubricity; eco-friendly lubrication
Dr. Qingwen Dai

E-Mail Website
Guest Editor
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
Interests: tribology; lubricant migration; surface texturing; magnetic fluid; heat and mass transfer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In addition to the required technical characteristics of lubricants, in recent years, the pollution and environmental health aspects of lubricating materials have drawn more and more attention. It is estimated that around 1 million tons of lost lubricants (20% of the total market) are released into the environment every year. Although additives are a minor portion of lubricant formulations, their influence on the environment is significant, especially in environmentally sensitive applications such as marine and agricultural lubricants.

In this Special Issue, we welcome original research articles and reviews in the field of eco-friendly lubricating additives, including friction modifiers, antiwear additives, extreme-pressure additives, corrosion inhibitors, emulsifiers, detergents, ashless additives, multifunctional additives and so on. Papers on the latest developments and future trends with regard to the following topics are invited to be submitted:

  • Additives with improved biodegradability and biocompatibility, which are potential alternatives to conventional additives.
  • Additives applied in novel green lubricants, e.g., the antioxidants and pour point depressants for plant oils, and the viscosity modifiers for water lubrication.

Prof. Dr. Ke Li
Dr. Qingwen Dai
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

  • eco-friendly lubrication
  • biodegradability
  • biocompatibility
  • friction modifiers
  • antiwear additives
  • extreme-pressure additives
  • antioxidants
  • pour point depressants
  • viscosity modifiers
  • corrosion inhibitors
  • emulsifiers
  • detergents
  • ashless additives
  • multifunctional additives
  • bio-based additives
  • nanoparticle additives

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Published Papers (2 papers)

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Research

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12 pages, 20153 KiB  
Article
Tribological Properties of h-BN, Ag and MgO Nanostructures as Lubricant Additives in Vegetable Oils
by Victoria Granja, Kollol Jogesh, Jaime Taha-Tijerina and C. Fred Higgs III
Lubricants 2024, 12(3), 66; https://doi.org/10.3390/lubricants12030066 - 21 Feb 2024
Cited by 3 | Viewed by 2131
Abstract
There exists an ever-growing need for sustainable engineering solutions to improve emission control and the energy efficiency of tribosystems. This study examines the tribological properties of two environmentally friendly vegetable fluids, soybean and sunflower oil, with the addition of three non-toxic nanostructures (h-BN, [...] Read more.
There exists an ever-growing need for sustainable engineering solutions to improve emission control and the energy efficiency of tribosystems. This study examines the tribological properties of two environmentally friendly vegetable fluids, soybean and sunflower oil, with the addition of three non-toxic nanostructures (h-BN, silver and MgO) at different concentrations. It was found that nanostructures added to vegetable oils at specific concentrations can exhibit good friction reduction and wear preventive properties. The addition of h-BN nanosheets in sunflower oil decreased the coefficient of friction and the wear damage, as measured by the wear scar diameter. Silver and magnesium oxide nanoparticles further reduced the friction and wear, respectively. In addition to the tribological testing of the samples, investigations were performed using an optical microscope, SEM and EDX to elucidate the mechanisms that may have led to the observed friction reduction and wear-preventive properties of different nanostructure additives. The thermophysical properties of the samples were also measured. It was found that the thermal conductivity of both base oils could be enhanced by 24% when using h-BN at 0.25 wt% concentration. Full article
(This article belongs to the Special Issue Eco-Friendly Lubricating Additives)
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Review

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29 pages, 11350 KiB  
Review
Fundamental Mechanisms Underlying the Effectiveness of Nanoparticle Additives to Lubricants: 25 Examples Linking Nano- to Macroscale Friction
by Jacqueline Krim and Alex I. Smirnov
Lubricants 2024, 12(6), 225; https://doi.org/10.3390/lubricants12060225 - 18 Jun 2024
Cited by 1 | Viewed by 1403
Abstract
Studies of the fundamental origins of friction have undergone rapid acceleration in recent years by providing valuable information on the nanoscale mechanisms responsible for friction at the macroscopic level. Significant efforts have been directed at developing composite nanofluids and nanoparticle additives to unlock [...] Read more.
Studies of the fundamental origins of friction have undergone rapid acceleration in recent years by providing valuable information on the nanoscale mechanisms responsible for friction at the macroscopic level. Significant efforts have been directed at developing composite nanofluids and nanoparticle additives to unlock new tribological properties unattainable by traditional lubricants. The studies are now further evolving by developing methods to achieve active control over nano- and/or mesoscale friction through the application of magnetic and electric fields external to the contact. These methods constitute an area of rapidly growing interest, and they also illuminate how the performance of conventional lubricants could be enhanced through the synergistic addition of nanoparticles (NPs). This mini review highlights 25 publications that collectively reveal significant progress, as well as important outstanding challenges, to the fundamental understanding of how the addition of NPs impacts lubricant performance. The first two topics focus on how Quartz Crystal Microbalance (QCM) nanotribological response to solid contacts can be linked to macroscale friction coefficients in the boundary lubrication regime and how QCM response upon immersion into a liquid is linked to macroscale lubricity in the mixed and hydrodynamic regimes. The third and fourth topics highlight the pivotal role of nanoparticle charge and surface treatments, while also indicating that the rolling of nanoparticles is ineffective and/or detrimental. The fifth topic focuses on applications that demonstrate the tuning of friction by varying nanoparticle electric charge and/or an external electric potential. The highlighted literature was selected to demonstrate a range of experimental and theoretical research, to provide direct connections between the nanoscale and macroscale tribological attributes, and to emphasize environmentally friendly lubricating materials such as water-based nanofluids. Full article
(This article belongs to the Special Issue Eco-Friendly Lubricating Additives)
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