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Processes
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Development of Sustainable Lubricating Greases
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Development of Sustainable Lubricating Greases

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Sustainable Processes".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 1404

Special Issue Editors

Prof. Dr. Erik Kuhn

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Guest Editor
TREC, Institute of Engineering Design and Product Development, Hamburg University of Applied Sciences, Berliner Tor 21, 20099 Hamburg, Germany
Interests: tribology; lubricating grease; energetic approach
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Miguel Ángel Delgado

E-Mail Website
Guest Editor
Departamento de Ingeniería Química, Centro de Investigación en Tecnología de Productos y Procesos Químicos (Pro2TecS), Campus de “El Carmen”, Universidad de Huelva, 21071 Huelva, Spain
Interests: smart lubricants; biolubricants; lubricating greases; friction; oleogels
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Lubricant greases have a diverse range of practical applications. There is a significant focus nowadays on replacing finite and environmentally harmful resources. This also applies to lubricants, hence the development of lubricating greases. Lubricating greases consist of a base oil and a solid (called a thickener). In the past, efforts have been made to replace lubricating oils with bio-oils and the solid with biogenic material. Rheological behavior, thermal analysis, microstructural characterization, and, of course, friction and wear behavior are the focus of these investigations. There have already been promising developments in this direction. In addition to the behavior of a lubricated friction pair, the behavior of the lubricant is also important. In particular, structural degradation should be considered.

We would like to encourage researchers to present their research results to the readership in the context of this Special Issue. This Special Issue serves to highlight new developments in the area of the development of sustainable lubricating greases.

Both review papers and original research articles are welcome.

Prof. Dr. Erik Kuhn
Prof. Dr. Miguel Ángel Delgado
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. Processes 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 2400 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

  • lubricating biogreases
  • oleogels
  • vegetable oils
  • biothickeners

Published Papers (2 papers)

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Research

14 pages, 993 KiB  
Article
Application of Raman Spectroscopy to Evaluate the Structure Changes of Lubricating Grease Modified with Montmorillonite after Tribological Tests
by Rafal Kozdrach
Processes 2024, 12(3), 565; https://doi.org/10.3390/pr12030565 - 13 Mar 2024
Viewed by 575
Abstract
This study shows the experimental data obtained by Raman spectroscopy to evaluate the structural changes of vegetable lubricants modified with montmorillonite after tribological tests. The analysis of the friction factor and limiting load of wear in the test for the examined grease compound [...] Read more.
This study shows the experimental data obtained by Raman spectroscopy to evaluate the structural changes of vegetable lubricants modified with montmorillonite after tribological tests. The analysis of the friction factor and limiting load of wear in the test for the examined grease compound shows a substantial effect on this parameter for grease. A change in the evaluated tribo-parameter results in a modification of the structure of the tested lubricant and changes in the protection efficiency of the tribological system. The amount of thickener, oil base and additive in the grease structure has an influence on the value of anti-wear properties, as shown by the data obtained in the tribological test described in this paper. The Raman spectroscopy tests showed that, in the tribological processes, some of the ingredients undergo an oxidative reaction, which leads to the formation of oxygenated organic substances that form an organic layer on the metal surface and counteract the wear of the lubricated contact surfaces. Other compounds come into close contact with the tribological layer, which increases its ability to resist wear and shear. The efficiency of the used additive is based on the formation (during friction) of a low-shear and high-plastic-strength thin film which is chemically highly bonded to the material and has a high level of durability against wear processes. As a consequence of the thermal decomposition of the additive, chemical interactions occur among the ingredients of the material of the substrate and the lubricants. Full article
(This article belongs to the Special Issue Development of Sustainable Lubricating Greases)
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12 pages, 43553 KiB  
Article
Energy Dissipation in Tribological Stressed Greases
by Erik Kuhn
Processes 2024, 12(1), 17; https://doi.org/10.3390/pr12010017 - 20 Dec 2023
Viewed by 522
Abstract
Lubricating greases that are subject to a continuous friction process are in a non-equilibrium state. In processes far from equilibrium, there is a possibility that dissipative structures will form. In this work, the conjecture is pursued that this is also possible in loaded [...] Read more.
Lubricating greases that are subject to a continuous friction process are in a non-equilibrium state. In processes far from equilibrium, there is a possibility that dissipative structures will form. In this work, the conjecture is pursued that this is also possible in loaded grease films. On the one hand, the shear process is considered in interaction with structural degradation, and on the other hand, the behavior of energy dissipation mechanisms is investigated. In the two models presented, it is shown that there are conditions under which it is possible to trigger self-organization processes. The next step must be the development of suitable experiments. Full article
(This article belongs to the Special Issue Development of Sustainable Lubricating Greases)
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