Effect of Surface Oxidation on Adsorption and Frictional Properties of Oiliness Additives Evaluated by Atomic Force Microscopy

IF 3.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2025-09-30 DOI:10.1007/s11249-025-02069-x

Lin Sun, Naoki Yamashita, Tomoko Hirayama, Kento Mimura, Yoshihiro Ito, Hironobu Nakanishi

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Abstract

A novel methodology using atomic force microscopy (AFM) has been developed for assessing the effect of surface oxidation on the adsorption and frictional properties of oiliness additives. This study focused on comparing the tribological behaviors of ester-based oiliness additives on oxidized versus pure Ti surfaces. The substrates were patterned to facilitate precise AFM-based friction testing. The oxide layer thickness was characterized by X-ray photoelectron spectroscopy and subsequently abraded using a diamond-coated AFM probe to expose the pure Ti surface. Tribological performance under atmospheric conditions was evaluated by comparing frictional properties using ester-based additives of varying ester functionalities, ranging from monoester to tetraester. Adsorption properties were characterized through neutron reflectometry and contact angle measurements. The results demonstrated a clear correlation between adsorption density and friction reduction, with tetraester showing superior performance, especially on pure Ti surfaces. These findings highlight the critical effect of oxidation states and additive molecular structures on frictional properties and adsorption behaviors at nanoscale resolution, providing valuable insights into boundary lubrication mechanisms and lubricant optimization.

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原子力显微镜研究表面氧化对油性添加剂吸附和摩擦性能的影响

本文提出了一种利用原子力显微镜（AFM）评价表面氧化对油性添加剂吸附和摩擦性能影响的新方法。本研究的重点是比较酯基油性添加剂在氧化钛和纯钛表面的摩擦学行为。为了便于精确的afm摩擦测试，对衬底进行了图案化处理。利用x射线光电子能谱对氧化层厚度进行表征，随后使用金刚石涂层AFM探针进行研磨，以暴露纯Ti表面。通过比较不同酯功能的酯基添加剂（从单酯到四酯）的摩擦性能，评估了常压条件下的摩擦学性能。通过中子反射和接触角测量对吸附性能进行了表征。结果表明，吸附密度与摩擦减少之间存在明显的相关性，四酯表现出优异的性能，特别是在纯钛表面上。这些发现强调了氧化态和添加剂分子结构对纳米级摩擦性能和吸附行为的关键影响，为边界润滑机制和润滑剂优化提供了有价值的见解。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.