{"title":"Relationship between Friction Reduction Effect and Solubility in Base Oil of Organic Friction Modifiers","authors":"Haiyang Gu , Tomoko Hirayama , Naoki Yamashita , Jimin Xu , Masako Yamada","doi":"10.1016/j.triboint.2024.110304","DOIUrl":null,"url":null,"abstract":"<div><div>This study explored the relationship between the solubility of additives in base oils and their friction-reduction efficacy using cetyl alcohol as a model additive. Atomic force microscope friction tests demonstrated that the friction-reduction effect of cetyl alcohol varied significantly across the base oils. The solvation free energy was computed to evaluate the solubility of cetyl alcohol. A direct proportional relationship between friction-reduction and solvation free energy was observed, indicating additives with lower solubility have better friction-reduction performance. Neutron reflectometry experiments and molecular dynamics simulations revealed that lower solubility correlates with stronger adsorption. This study quantitatively clarified the relationship between solubility, adsorption, and friction reduction, providing insights into optimizing lubricant formulations and contributing to a deeper understanding of boundary lubrication mechanisms.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110304"},"PeriodicalIF":6.1000,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tribology International","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301679X24010569","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This study explored the relationship between the solubility of additives in base oils and their friction-reduction efficacy using cetyl alcohol as a model additive. Atomic force microscope friction tests demonstrated that the friction-reduction effect of cetyl alcohol varied significantly across the base oils. The solvation free energy was computed to evaluate the solubility of cetyl alcohol. A direct proportional relationship between friction-reduction and solvation free energy was observed, indicating additives with lower solubility have better friction-reduction performance. Neutron reflectometry experiments and molecular dynamics simulations revealed that lower solubility correlates with stronger adsorption. This study quantitatively clarified the relationship between solubility, adsorption, and friction reduction, providing insights into optimizing lubricant formulations and contributing to a deeper understanding of boundary lubrication mechanisms.
期刊介绍：
Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International.
Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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