Understanding Adsorption Behaviors of Organic Friction Modifiers on Hydroxylated SiO<sub>2</sub> (001) Surfaces: Effects of Molecular Polarity and Temperature
Junqin Shi, Qing Zhou, Kun Sun, Guoqiang Liu, Feng Zhou
Abstract
system with temperature and decrease rapidly as temperature exceeds a critical value for both R-OH and R-COOH systems. The single-molecule geometry optimization validates the significant role of the electrostatic and hydrogen-bond attractions in molecular adsorption. Therefore, the OFMs with stronger polarity (like R-COOH) present stronger adsorption and better temperature resistance. The findings in this work are of particular value and provide a guideline in designing and engineering novel OFM additives for extreme lubrication conditions.
Topics & Concepts
ChemistryAdsorptionPhysisorptionChemical polarityMoleculeDesorptionHydrogen bondMonolayerPolarity (international relations)TrimerChemical physicsPhysical chemistryOrganic chemistryCellDimerBiochemistryLubricants and Their AdditivesTribology and Wear AnalysisFuel Cells and Related Materials