Advances in Ionic Liquids as New Lubricant Materials

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

Deadline for manuscript submissions: 30 January 2026 | Viewed by 1098

Special Issue Editors


E-Mail Website
Guest Editor
Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal
Interests: tribology; biotribology; tribocorrosion; ionic liquids

E-Mail Website
Guest Editor
Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal
Interests: coatings; tribology; ionic liquids
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Advances have been made in the use of ionic liquids (ILs) as new lubricants, which have revolutionized the field of tribology by offering unique properties such as low volatility, high thermal stability, and tunable viscosity. ILs exhibit excellent lubrication performance under extreme conditions, reducing friction and wear more effectively than traditional lubricants. Their customizable chemical structures allow for the design of specific ILs tailored to particular applications, enhancing their efficiency. Additionally, the environmentally friendly nature of many ILs positions them as sustainable alternatives to conventional lubricants. Ongoing research focuses on understanding the fundamental mechanisms of lubrication by ILs and on overcoming challenges related to cost and large-scale production, aiming to fully integrate these advanced materials into industrial applications.

Dr. Luís Vilhena
Dr. Fábio Ferreira
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

  • lubricant additives
  • ionic liquids
  • tribology
  • lubrication regime
  • stribeck curve
  • friction
  • wear
  • tribofilm formation

Benefits of Publishing in a Special Issue

  • Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.
  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

19 pages, 8971 KiB  
Article
Synthesis of an Ionic Liquid-Based Cutting Lubricant and Its Performance Comparison with Mineral Oil in Hard Turning
by Rajashree Mallick, Ramanuj Kumar, Amlana Panda, Ashok Kumar Sahoo and Diptikanta Das
Lubricants 2025, 13(4), 166; https://doi.org/10.3390/lubricants13040166 - 6 Apr 2025
Viewed by 293
Abstract
This study compares the hard turning performance under dual-nozzle minimum quantity lubrication (MQL) using mineral oil and 1-butyl-3-methylimidazolium chloride-based ionic fluids. Key performance indicators, including tool life (based on tool wear), surface roughness, cutting power, cutting temperature, cutting sound, carbon emission, and circularity [...] Read more.
This study compares the hard turning performance under dual-nozzle minimum quantity lubrication (MQL) using mineral oil and 1-butyl-3-methylimidazolium chloride-based ionic fluids. Key performance indicators, including tool life (based on tool wear), surface roughness, cutting power, cutting temperature, cutting sound, carbon emission, and circularity error, were evaluated to assess manufacturing sustainability. The results revealed that ionic fluid-assisted MQL significantly outperformed mineral oil, improving tool life by 28.75% and reducing surface roughness by 5.58%, attributed to the superior lubrication and cooling ability of ionic fluids. Additionally, after 85 min of machining, the power consumption and carbon emission were greatly reduced under ionic fluid conditions, indicating a lower environmental impact. For precision machining concerns, the ionic fluid proved more favorable, as circularity error under mineral oil conditions was 2.67 times higher than with ionic fluids. The weighted Pugh matrix awarded ionic fluid a higher sustainability score (+7) than mineral oil (+1), establishing it as the superior cooling option for hard turning, enhancing sustainability in machining difficult-to-cut metals. Full article
(This article belongs to the Special Issue Advances in Ionic Liquids as New Lubricant Materials)
Show Figures

Figure 1

18 pages, 14556 KiB  
Article
Novel Water-Based Biolubricants Using Choline Ionic Liquids
by Paloma Mostaza, María-Dolores Avilés, Pablo M. Martínez-Rubio, María-Dolores Bermúdez and Francisco J. Carrión-Vilches
Lubricants 2025, 13(3), 122; https://doi.org/10.3390/lubricants13030122 - 12 Mar 2025
Viewed by 436
Abstract
Ionic liquid molecules exhibit a variety of properties that are well suited for use as lubricants or additives for lubricants, since they form tribolayers that reduce friction and wear. As additives in the design of new water-based biolubricants, ionic liquids present the advantages [...] Read more.
Ionic liquid molecules exhibit a variety of properties that are well suited for use as lubricants or additives for lubricants, since they form tribolayers that reduce friction and wear. As additives in the design of new water-based biolubricants, ionic liquids present the advantages of polar nature to use in aqueous lubrication, whilst being biocompatible and with null toxicity, opening up the opportunity to develop novel biolubricants. Choline is a cation present in numerous ionic liquids and is widely recognized for its water solubility, biodegradability, low toxicity, and role as a green solvent in different applications. This work presents the comparative studies of several water-based biolubricants and thin-layer films on stainless steel using a low proportion of Choline-based ionic liquids. The results of friction and wear using water-based biolubricants with 1 wt% of different Choline-based ionic liquids showed good tribological performance. In addition, Choline Lysinate, an amino-acid ionic liquid which is biocompatible, nontoxic, and biodegradable, presented excellent performance and was used as a precursor of thin-layer films on stainless steel showing outstanding behavior in pin-on-disc configuration and sapphire/stainless-steel contacts. Subsequent X-ray photoelectron spectroscopy confirmed the presence of a tribolayer containing the amino acid compound on the metallic surface. Full article
(This article belongs to the Special Issue Advances in Ionic Liquids as New Lubricant Materials)
Show Figures

Graphical abstract

Back to TopTop