Due to the inherent damage effect, friction heat is commonly undesirable yet inevitable in moving components. Hence, obtaining robust running of mechanical assemblies under high sliding velocity is challenging. Herein, we report an alternative strategy to design robust self-healing lubricity materials by taking advantage of friction heat-driven solid-liquid phase transition employing facile coatings of -alkanols/epoxy resin. The lubricity performance of composite coatings increased with sliding velocity, leading to a low friction coefficient (0.066) and wear rate (1.968 × 10 mm N m) under 5000 rpm. The low friction was mainly attributed to the controlled phase-transition characteristics of -alkanols, which absorbed friction heat to release liquid -alkanols for maintaining intelligent shear interfaces. The low wear was ascribed to the high load-bearing capacity and self-healing property of composite coatings. Our study may guide a common framework to rationally design self-healing lubricant materials solid-liquid phase transition by utilizing the undesirable (yet inevitable) friction heat. Our approach could achieve the robust, ultralow friction and wear of moving components under harsh working conditions.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1039/d4mh00637b | DOI Listing |
J Phys Chem Lett
January 2025
Laoshan Laboratory, Qingdao 266237, China.
Nucleation of multicomponent systems is a pervasive phenomenon in nature and is pertinent to a diverse array of scientific and industrial challenges. The nucleation mechanisms of immiscible multicomponent systems remain unclear. Here, gas hydrate is employed as a model system to study the nucleation of multicomponent systems.
View Article and Find Full Text PDFLangmuir
January 2025
College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China.
Flotation is an interfacial process involving gas, liquid, and solid phases, where polar ionic promoters significantly influence both gas-liquid and solid-liquid interfaces during low-rank coal (LRC) flotation. This study examines how the structures of hydrophilic groups in cation-anion mixed promoters affect the interfacial flotation performance of LRC pulp using flotation tests, surface tension tests, wetting heat tests, and molecular dynamics simulations. Results indicate that cation-anion mixed promoters enhance the LRC floatability to varying degrees.
View Article and Find Full Text PDFFood Res Int
January 2025
Department of Food Engineering and Technology, Faculty of Food Engineering, Universidade Estadual de Campinas (UNICAMP), 13083-862, Campinas, Brazil. Electronic address:
This study focused on evaluating the fractionation of pequi oil and modeling the process using solid-liquid equilibrium (SLE) theory. The pequi oil was comprehensively characterized, including its fatty acid (FA) and acylglycerol (AG) profiles, moisture content, acidity, carotenoid levels, and thermal behavior. Low acidity and partial acylglycerols content, along with its TAG profile (mainly OOP, POP, OOO and PPP) and melting behavior proved that, in fact, this oil is quite suitable for fractionation.
View Article and Find Full Text PDFRSC Adv
January 2025
Department of Materials Science and Engineering, University of Texas Dallas 800 W Campbell Rd Richardson TX 75080 USA
Although the Rare Earth (RE)FeB type magnets were invented in the 1980s and are widely used worldwide. Yet, the phase formation and dissolution mechanisms are still not crystal clear. The reaction dynamics between rare earth elements (REE) and the iron-enriched matrix are essential to understanding the formation of hard magnetic REE-Fe-B phase or, conversely, phase dissociation and performance degeneration.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China.
In this study, molecular dynamics (MD) simulations were employed to compare the effects of different solidification conditions on the solidification behaviour, stress distribution, and degree of crystallization of iron. The results indicate significant differences in nucleation and microstructural evolution between the two solidification methods. In the homogeneous temperature field, the solidification of iron is characterized by instantaneous nucleation.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!