Applied Nanotribology II

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

Deadline for manuscript submissions: closed (1 December 2022) | Viewed by 7115

Special Issue Editors


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Guest Editor
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Interests: nanotribology; lubricants; nanowear; ultra-precision surface manufacturing; nanomaterials
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
Interests: tribology; glass surfaces; cellulosic nanomaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Tribological issues exist in almost all machines and mechanical systems with moving parts, and are one of the major causes of energy consumption and material loss. With the development of automation technology, such issues have become more critical and significantly augmented economic expenditure. Nanotribology is a branch of tribology that studies adhesion, friction, wear and lubrication phenomena viewed at the scale of atoms and molecules. Although macroscale tribological interfaces can be simplified as multiple-asperities contact at nanoscale, the problems faced in nanotribology are unique due to the extremely high surface-to-volume ratio of nanoscale components. 

The invention of probe-based techniques (scanning tunneling microscope, atomic force microscope, etc.) and the application of computational simulations (molecular dynamics, density functional theory, etc.) offered the opportunity for tribological study at the atomic and molecular scales. The appearance of nanomaterials and the development of nanostructures open the doors to achieve nearly zero friction and wearless states (e.g., superlubricity). Nanotribological approaches can be employed to find the interplay among different tribological properties. As the dimension shrinks to nanoscale, adhesion due to interfacial bonding and capillary meniscus becomes indispensable. In addition, the chemistry of the sliding interface changes dynamically due to mechanical activation, so tribochemistry must be considered in many practical applications, including precision surface manufacturing, tribological systems, microsystems and actuators, among others.

This Special Issue aims to share the most recent experimental, theoretical and computational findings concerning adhesion, friction, wear and lubrication at nanoscale.

Prof. Dr. Lei Chen
Prof. Dr. Seong Han Kim
Guest Editors

Manuscript Submission Information

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Keywords

  • nanowear
  • tribochemistry
  • interfacial adhesion
  • lubricants and additives
  • modeling and simulation
  • superlubricity at small scale
  • ultra-precision surface manufacturing
  • novel experimental and computational approaches for nanotribology

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Published Papers (2 papers)

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Research

9 pages, 7562 KiB  
Article
Adhesion and Electron Properties of Quasi-2D Mo2C, Ti2C, and V2C MXene Flakes after Van Der Waals Adsorption of Alcohol Molecules: Influence of Humidity
by Dmitry A. Kolosov, Semyon G. Levitsky and Olga E. Glukhova
Lubricants 2022, 10(7), 159; https://doi.org/10.3390/lubricants10070159 - 17 Jul 2022
Cited by 3 | Viewed by 2593
Abstract
The adhesive properties of new materials quasi-2D Mo2C, Ti2C, and V2C MXene flakes play a crucial role (1) in the formation of highly efficient lubricants; (2) in the development of highly sensitive gas sensors. This paper reports [...] Read more.
The adhesive properties of new materials quasi-2D Mo2C, Ti2C, and V2C MXene flakes play a crucial role (1) in the formation of highly efficient lubricants; (2) in the development of highly sensitive gas sensors. This paper reports DFT modeling of adsorption of alcohol molecules onto the surface of quasi-2D nanometer-thick flakes of MXenes. The parameters characterizing the adsorption mechanism were the analyte+surface binding energy, Fermi energy, and electrical conductivity. Due to the presence of water in the environment, MXene surfaces with varying degrees of humidity were studied, and the patterns of analyte adsorption onto a wet surface were investigated. A different approach to adhesion of alcohols for wet and dry surfaces has been established in this study. Full article
(This article belongs to the Special Issue Applied Nanotribology II)
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17 pages, 6588 KiB  
Article
Lubrication Performance of Sunflower Oil Reinforced with Halloysite Clay Nanotubes (HNT) as Lubricant Additives
by Md Abu Sayeed Biswas, Md Mashfiqur Rahman, Javier A. Ortega, Laura Peña-Parás, Demófilo Maldonado-Cortés, José A. González, Ricardo Cantú, Adrián Campos and Eugenio Flores
Lubricants 2022, 10(7), 139; https://doi.org/10.3390/lubricants10070139 - 4 Jul 2022
Cited by 10 | Viewed by 3963
Abstract
This study evaluates the tribological performance of nanolubricants of a vegetable oil (sunflower oil) reinforced with different concentrations of environmentally-friendly nanoparticles of halloysite clay nanotubes (HNTs). Tribological characterization was performed under different conditions to determine its effect on the nanolubricants’ performance and optimal [...] Read more.
This study evaluates the tribological performance of nanolubricants of a vegetable oil (sunflower oil) reinforced with different concentrations of environmentally-friendly nanoparticles of halloysite clay nanotubes (HNTs). Tribological characterization was performed under different conditions to determine its effect on the nanolubricants’ performance and optimal HNT concentration. The tribological performances under low and high contact pressures were analyzed with a block-on-ring tribometer following the ASTM G-077-05 standard procedure. The extreme pressure (EP) properties of the nanolubricants were determined with a T-02 four-ball tribotester according to the ITeE-PIB Polish method for testing lubricants under scuffing conditions. In addition, the lubrication performance of the newly-developed vegetable oil-based nanolubricants was evaluated in an industrial-type application through a tapping torque test. The results indicated that at a low contact pressure 1.5 wt.% HNTs/sunflower oil provided the best tribological behavior by decreasing the coefficient of friction (COF) and wear volume loss by 29 and 70%, respectively. For high contact pressures, 0.05 wt.% HNTs lowered COF and wear by 55% and 56%, respectively. The load-carrying capacity increased by 141% with 0.10 wt.% HNTs compared to the sunflower oil. A high tapping torque efficiency was obtained with HNTs that can prolong tool life in the machining process. Therefore, this study suggests that HNTs/sunflower oil could be used as green lubricants for industrial applications. Full article
(This article belongs to the Special Issue Applied Nanotribology II)
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