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Lubricants
Special Issues
Advanced Polymeric and Colloidal Lubricants
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Advanced Polymeric and Colloidal Lubricants

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

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 11091

Special Issue Editors

Dr. Vahid Adibnia

E-Mail Website
Guest Editor
Department of Applied Oral Sciences, School of Biomedical Engineering, Dalhousie University, Halifax, NS B3H 4R2, Canada
Interests: biolubrication; polymeric lubricants; nanotribology; hydration lubrication; synovial joints; intermolecular and surface forces; biointerfaces; bioinspired materials; biosourced materials
Dr. Tianyi Han

E-Mail Website
Guest Editor
State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
Interests: liquid superlubricity; hydration lubrication

Special Issue Information

Dear Colleagues,

Over the past two decades, our understanding of complex intermolecular interactions responsible for friction and wear reduction in mechanical and biomechanical systems has improved significantly. As a result, there has been a burst of novel materials and technologies designed and evaluated to improve efficiency and sustainability of these systems. Three classes of materials especially stand out as novel solutions for friction and wear reduction as they allow precise control of friction forces at the intermolecular scale: (i) polymeric materials and coatings, including biosourced and bioinspired polymers, proteins and peptides as well as synthetic ones, (ii) nanoparticle-based coatings, with novel geometries and surface modifications, either natural or synthetic, and (iii) electrolyte-based lubricating systems, including highly concentrated electrolytes and ionic liquids. 

Our objective in this Special Issue of Lubricants is to provide a platform for you to publish your most recent advances in designing and understanding state-of-the-art polymeric, colloidal and electrolyte-based friction-mediating materials and technologies. We welcome contributions on experimental, theoretical and computer simulation aspects of controlling friction and wear in such materials. We hope that this Special Issue will form a collection of multifaceted articles showcasing the advances in the field of lubricating soft materials. We look forward to reading your notable contributions to this field.

Dr. Vahid Adibnia
Dr. Tianyi Han
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

  • friction
  • coating
  • materials
  • biomaterials
  • polymers
  • nanomaterials
  • electrolytes
  • interface science
  • lubricants
  • biolubrication
  • joints
  • cartilage
  • osteoarthritis
  • hydration
  • wear protection
  • drag reduction
  • sustainability
  • tribology

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Published Papers (5 papers)

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14 pages, 6351 KiB  
Article
Comparative Study on the Lubrication of Ti3C2TX MXene and Graphene Oxide Nanofluids for Titanium Alloys
by Yaru Tian, Ye Yang, Heyi Zhao, Lina Si, Hongjuan Yan, Zhaoliang Dou, Fengbin Liu and Yanan Meng
Lubricants 2024, 12(8), 285; https://doi.org/10.3390/lubricants12080285 - 9 Aug 2024
Viewed by 851
Abstract
Titanium alloys are difficult to machine and have poor tribological properties. Nanoparticles have good cooling and lubricating properties, which can be used in metal cutting fluid. The lubrication characteristics of the two-dimensional materials Ti3C2TX MXene and graphene oxide [...] Read more.
Titanium alloys are difficult to machine and have poor tribological properties. Nanoparticles have good cooling and lubricating properties, which can be used in metal cutting fluid. The lubrication characteristics of the two-dimensional materials Ti3C2TX MXene and graphene oxide in water-based fluid for titanium alloys were comparatively investigated in this paper. Graphene oxide had smaller friction coefficients and wear volume than Ti3C2TX MXene nanofluid. As to the mechanism, MXene easily formed TiO2 for the tribo-chemical reaction, which accelerated wear. Moreover, GO nanofluid can form a more uniform and stable friction layer between the frictional interface, which reduces the friction coefficient and decreases the adhesive wear. The effects of different surfactants on the lubricating properties of MXene were further investigated. It was found that the cationic surfactant Hexadecyl trimethyl ammonium chloride (1631) had the lowest friction coefficient and anti-wear properties for the strong electrostatic attraction with MXene nanoparticles. The results of this study indicate that 2D nanoparticles, especially graphene oxide, could improve the lubricating properties of titanium alloys. It provides insight into the application of water-based nanofluids for difficult-to-machine materials to enhance surface quality and cutting efficiency. The developed nanofluid, which can lubricate titanium alloys, effectively has very broad applications in prospect. Full article
(This article belongs to the Special Issue Advanced Polymeric and Colloidal Lubricants)
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Review

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40 pages, 6373 KiB  
Review
Research on Polymer Wear under Water Conditions: A Review
by Shuyuan Song, Zehan Zhu, Shaonan Du, Yunlong Li and Changfu Liu
Lubricants 2024, 12(9), 312; https://doi.org/10.3390/lubricants12090312 - 4 Sep 2024
Viewed by 1256
Abstract
Polymeric materials are widely used in aerospace, biomedical, marine, and agricultural applications due to their viscoelasticity and corrosion resistance. Polymeric materials fail due to wear during their service life, so studying their wear behavior is essential to control and predict their service life. [...] Read more.
Polymeric materials are widely used in aerospace, biomedical, marine, and agricultural applications due to their viscoelasticity and corrosion resistance. Polymeric materials fail due to wear during their service life, so studying their wear behavior is essential to control and predict their service life. This paper summarizes the progress of water lubrication research as well as experimental studies on the wear of polymeric materials under aqueous conditions. The effects of lubrication conditions, material formulation ratios, load, sliding speed, impact angle, abrasive particles, and temperature factors on the wear behavior of commonly used polymeric materials ideal for water lubrication (NBR, SBR, NR, EP, polyethylene, and their composites, etc.) are summarized in terms of the three most frequently occurring forms of wear, namely, two-body wet sliding wear, two-body erosive wear, and three-body wet abrasive particle wear. The results show that the mechanical properties, such as hardness, can be effectively changed by altering the formulation ratios of the materials, and the hardness and hydrophilicity of the formulations can further affect the wear and lubrication. In general, the coefficient of friction and the wear rate decrease with the increase in hardness, and the increase in temperature leads to the localized lubrication failure and the aging of the materials, which in turn leads to the intensification of wear. Among the working condition factors, load and sliding speeds are the most important factors affecting the wear, and the wear rate increases with the increase in the load and sliding speed; in contrast, the three-body wet abrasive wear is more obviously affected by the load. In the study of the impact angle effect, the overall trend of the erosion wear rate with the increase in the angle shows the first rise and then fall, the maximum value is mostly concentrated in the 45–60° between. Usually, the increase in the abrasive particle size can make the wear rate increase. Overall, the three-body wet abrasive wear of the rubber material wear rate shows first an increase and then a decrease. The research in this paper provides theoretical support and reference ideas for the tribological study of polymer materials in the water environment and puts forward the outlook for future water lubrication and material improvement of the research directions and applications. Full article
(This article belongs to the Special Issue Advanced Polymeric and Colloidal Lubricants)
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22 pages, 32697 KiB  
Review
Molecular Dynamics Simulation on Polymer Tribology: A Review
by Tianqiang Yin, Guoqing Wang, Zhiyuan Guo, Yiling Pan, Jingfu Song, Qingjun Ding and Gai Zhao
Lubricants 2024, 12(6), 205; https://doi.org/10.3390/lubricants12060205 - 4 Jun 2024
Cited by 1 | Viewed by 1722
Abstract
A profound comprehension of friction and wear mechanisms is essential for the design and development of high-performance polymeric materials for tribological application. However, it is difficult to deeply investigate the polymer friction process in situ at the micro/mesoscopic scale by traditional research methods. [...] Read more.
A profound comprehension of friction and wear mechanisms is essential for the design and development of high-performance polymeric materials for tribological application. However, it is difficult to deeply investigate the polymer friction process in situ at the micro/mesoscopic scale by traditional research methods. In recent years, molecular dynamics (MD) simulation, as an emerging research method, has attracted more and more attention in the field of polymer tribology due to its ability to show the physicochemical evolution between the contact interfaces at the atomic scale. Herein, we review the applications of MD in recent studies of polymer tribology and their research focuses (e.g., tribological properties, distribution and conformation of polymer chains, interfacial interaction, frictional heat, and tribochemical reactions) across three perspectives: all-atom MD, reactive MD, and coarse-grained MD. Additionally, we summarize the current challenges encountered by MD simulation in polymer tribology research and present recommendations accordingly, aiming to provide several insights for researchers in related fields. Full article
(This article belongs to the Special Issue Advanced Polymeric and Colloidal Lubricants)
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29 pages, 3112 KiB  
Review
Oral Lubrication, Xerostomia, and Advanced Macromolecular Lubricants for Treatment of Dry Mouth
by William Austin, Maryam Hdeib, Paige Fraser, Maya Goldchtaub, Elika Shams, Tianyi Han, Pierre-Luc Michaud and Vahid Adibnia
Lubricants 2024, 12(4), 126; https://doi.org/10.3390/lubricants12040126 - 12 Apr 2024
Cited by 2 | Viewed by 3503
Abstract
Dry mouth, also known as xerostomia, is a condition in which insufficient or ineffective saliva does not provide sufficient oral lubrication. The severity of this condition can vary from a mild discomfort to a debilitating condition that greatly impairs patients’ lives. Xerostomia arises [...] Read more.
Dry mouth, also known as xerostomia, is a condition in which insufficient or ineffective saliva does not provide sufficient oral lubrication. The severity of this condition can vary from a mild discomfort to a debilitating condition that greatly impairs patients’ lives. Xerostomia arises as a side effect of various medications, diseases, radiation therapy, chemotherapy, or nerve damage. Various aqueous dispersions of macromolecules have been proposed to assist or replace the saliva in these patients. It is vital that these macromolecules have ample lubricity and water retention properties while showing long-lasting efficacy. The emphasis of this review is to provide a general overview on lubricating macromolecules that have been clinically used or reported in the literature as potential replacements for saliva. These include various natural or synthetic polymers, proteins, peptides, and lipids that are used in the form of solutions, gels, emulsions, and colloids. Perspectives into the future of macromolecular oral lubricants in the treatment of xerostomia are also provided. Full article
(This article belongs to the Special Issue Advanced Polymeric and Colloidal Lubricants)
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23 pages, 9472 KiB  
Review
The Application of Ionic Liquids in the Lubrication Field: Their Design, Mechanisms, and Behaviors
by Mengmeng Liu, Jing Ni, Caixia Zhang, Ruishen Wang, Qiang Cheng, Weihao Liang and Zhifeng Liu
Lubricants 2024, 12(1), 24; https://doi.org/10.3390/lubricants12010024 - 13 Jan 2024
Cited by 1 | Viewed by 2964
Abstract
Ionic liquids (ILs) are molten organic salts consisting of organic cations and weakly coordinating organic/inorganic anions at room temperature. ILs have excellent physical and chemical properties such as high thermal stability, high combustible temperature, high miscibility with organic compounds and so on, making [...] Read more.
Ionic liquids (ILs) are molten organic salts consisting of organic cations and weakly coordinating organic/inorganic anions at room temperature. ILs have excellent physical and chemical properties such as high thermal stability, high combustible temperature, high miscibility with organic compounds and so on, making them good candidates for high performance lubricants and lubricant additives. The functional designability of ILs makes them novel lubrication materials that can break through the bottleneck of the active control of friction and lubrication. This paper firstly briefly introduces how to design the physical and chemical properties of the ILs required for different friction conditions by bonding specific cations with anions. Then, the lubrication mechanisms of ILs as base lubricants and additives for oils and water are focused on. The correlation between the structure of ILs and the lubrication results are established, which can guide the structural design of ILs in different applications. The response behaviors of friction characteristics under external electric fields are analyzed, which can provide a theoretical basis for the intelligent control of friction based on ILs. Full article
(This article belongs to the Special Issue Advanced Polymeric and Colloidal Lubricants)
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