Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions
Abstract Polyalkylene glycol (PAG) aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient (COF, μ < 0.01). However, the prolonged running-in period and low bearing capacity have limited its widespread application. In this study, we determined that the runnin...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-07-01
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| Series: | Friction |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40544-022-0626-5 |
| _version_ | 1797863545109479424 |
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| author | Wenrui Liu Hongdong Wang Yuhong Liu |
| author_facet | Wenrui Liu Hongdong Wang Yuhong Liu |
| author_sort | Wenrui Liu |
| collection | DOAJ |
| description | Abstract Polyalkylene glycol (PAG) aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient (COF, μ < 0.01). However, the prolonged running-in period and low bearing capacity have limited its widespread application. In this study, we determined that the running-in period can be decreased by more than 75% when the pH value of the lubricant is controlled at 3 by introducing various acid solutions. Additionally, less time was required to realize stable superlubricity with inorganic acid at lower pH values. This was mainly attributed to the acceleration effect of hydrogen ions around the contact region. In case of PAG aqueous solution with organic acid, the wear loss between sliding solid surfaces was reduced, and thus the bearing pressure during the superlubricity period was significantly improved from approximately 30 to 160 MPa. Furthermore, the organic acid molecules were considered to form strong hydrogen bonds with PAG macromolecules and solid surfaces. This in turn strengthened the structure of the adsorption layers. The unique effect of different acids in aqueous polymer lubrication can potentially significantly aid in advancing the study of polymer tribology and broadening industrial applications. |
| first_indexed | 2024-04-09T22:38:16Z |
| format | Article |
| id | doaj.art-7f4298f891a147eb84b67fdfb749d7c8 |
| institution | Directory Open Access Journal |
| issn | 2223-7690 2223-7704 |
| language | English |
| last_indexed | 2024-04-09T22:38:16Z |
| publishDate | 2022-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Friction |
| spelling | doaj.art-7f4298f891a147eb84b67fdfb749d7c82023-03-22T12:21:18ZengSpringerOpenFriction2223-76902223-77042022-07-011171138114910.1007/s40544-022-0626-5Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutionsWenrui Liu0Hongdong Wang1Yuhong Liu2State Key Laboratory of Tribology, Tsinghua UniversitySchool of Mechatronic Engineering and Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai UniversityState Key Laboratory of Tribology, Tsinghua UniversityAbstract Polyalkylene glycol (PAG) aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient (COF, μ < 0.01). However, the prolonged running-in period and low bearing capacity have limited its widespread application. In this study, we determined that the running-in period can be decreased by more than 75% when the pH value of the lubricant is controlled at 3 by introducing various acid solutions. Additionally, less time was required to realize stable superlubricity with inorganic acid at lower pH values. This was mainly attributed to the acceleration effect of hydrogen ions around the contact region. In case of PAG aqueous solution with organic acid, the wear loss between sliding solid surfaces was reduced, and thus the bearing pressure during the superlubricity period was significantly improved from approximately 30 to 160 MPa. Furthermore, the organic acid molecules were considered to form strong hydrogen bonds with PAG macromolecules and solid surfaces. This in turn strengthened the structure of the adsorption layers. The unique effect of different acids in aqueous polymer lubrication can potentially significantly aid in advancing the study of polymer tribology and broadening industrial applications.https://doi.org/10.1007/s40544-022-0626-5superlubricityrunning-in timebearing pressureorganic acidhydrogen bond |
| spellingShingle | Wenrui Liu Hongdong Wang Yuhong Liu Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions Friction superlubricity running-in time bearing pressure organic acid hydrogen bond |
| title | Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions |
| title_full | Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions |
| title_fullStr | Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions |
| title_full_unstemmed | Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions |
| title_short | Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions |
| title_sort | adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions |
| topic | superlubricity running-in time bearing pressure organic acid hydrogen bond |
| url | https://doi.org/10.1007/s40544-022-0626-5 |
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