Advanced Lubrication for Energy Efficiency II

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

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 4899

Special Issue Editors

Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831-6063, USA
Interests: advanced lubrication for energy efficiency; surface engineering for wear and corrosion protection; nanostructured energy materials; nuclear tribology; advanced manufacturing
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 73000, China
Interests: lubricant additives; synthetic lubricant; environmental friendly lubricant; tribochemistry; high-performance lubricants

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Guest Editor
Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831-6063, USA
Interests: design, synthesis, and surface modification of nanomaterials as lubricant additives and protective coating; tribochemistry and tribofilm nanostructures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is the second part of “Advanced Lubrication for Energy Efficiency”.

Friction and wear are responsible for significant energy consumption. Specifically, among the 110 quads of energy currently consumed in transportation alone, over 30% is spent to overcome the parasitic losses due to friction and wear. Lubricants have always been essential in human history and the focus has gradually shifted from ‘mobility’ in ancient era to ‘durability’ in modern life and then to ‘efficiency’ currently and in the foreseeable future. There is a consensus that savings of 1.0−1.4% of a country’s GDP may be achieved through lubrication R&D, which has prompted the relentless pursuit of advances in lubricants in order to increase both energy efficiency and durability.

Lubrication science deals with chemomechanical interfacial phenomena that can be divided into four major regimes: Hydrodynamic, elastohydrodynamic, mixed, and boundary lubrication. A lubricated contact interface is an extremely dynamic system involving transient mechanical and thermal stress resulting in complex physical and chemical interactions.

This Special Issue aims the latest advances in lubrication research and development. Contributions are welcome from both academic researchers and their industrial peers dealing with innovating new lubricant chemistries (base stocks, additives, and formulations), revealing compatibilities between lubricants and contact surfaces (physical and chemical interactions), and investigating lubrication mechanisms (interfacial phenomena).

Dr. Jun Qu
Dr. Weimin Li
Dr. Chanaka Kumara
Guest Editors

Manuscript Submission Information

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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

  • lubrication
  • energy efficiency
  • friction
  • wear
  • viscosity
  • tribofilm

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Published Papers (1 paper)

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Research

14 pages, 4915 KiB  
Article
Synergistic and Competitive Effects between Zinc Dialkyldithiophosphates and Modern Generation of Additives in Engine Oil
by Khai K. Huynh, Kiet A. Tieu and Sang T. Pham
Lubricants 2021, 9(4), 35; https://doi.org/10.3390/lubricants9040035 - 31 Mar 2021
Cited by 23 | Viewed by 4089
Abstract
The increasing demand for low-viscosity engine oil has underscored the role of zinc dialkyldithiophosphates (ZDDP) as a conventional anti-wear and antioxidant additive. It is essential to investigate the influence of modern additives such as cyclopropanecarboxylic acid (CPCa) and Ni nanoparticles on the tribological [...] Read more.
The increasing demand for low-viscosity engine oil has underscored the role of zinc dialkyldithiophosphates (ZDDP) as a conventional anti-wear and antioxidant additive. It is essential to investigate the influence of modern additives such as cyclopropanecarboxylic acid (CPCa) and Ni nanoparticles on the tribological performance of ZDDP for practical commercial oil application. According to the experimental results, Ni nanoparticles formed a protective film that exhibited a synergistic effect with ZDDP. A significantly higher concentration of sulphur in the tribofilm was detected compared to ZDDP by itself, which was responsible for a 27.6% lower wear loss. Meanwhile, a competitive effect between CPCa and ZDDP resulted in a dramatic increase in friction and unstable anti-wear performance. This was demonstrated by a localized formation of the ZDDP tribofilm on the wear surfaces after the friction test. These results have highlighted the synergistic and competitive effects of emerging additives (CPCa and Ni nanoparticles) in the ZDDP tribofilm formation between the sliding steel contacts. This further suggests a new approach to increase the efficiency of ZDDP’s tribological performance at cold start-up processes. Full article
(This article belongs to the Special Issue Advanced Lubrication for Energy Efficiency II)
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