Article 2025 · 8 citations

Improvement of oxidation stability, hydrolytic stability and tribological properties of kaolin particles doped bio-based green palm oil

Ozakin, Batuhan, Gultekin, Kursat, Yurdgulu, Halil Ibrahim

Abstract

Petroleum-based lubricants used in metalworking pose environmental and health risks due to harmful byproducts from combustion and waste disposal. This highlights the need for eco-friendly bio-based lubricants, which, despite their benefits, exhibit low oxidative and hydrolytic stability. Nano-additives provide a sustainable and cost-effective solution to improve these properties. In this study, nanolubricants were prepared by doping kaolin nanoparticles subjected to surface modification with oleic acid to bio-based palm lubricants. The tribological performance of lubricants was assessed via wear tests, oxidative stability was evaluated using the hot oil oxidation test, and hydrolytic stability was determined through the Karl Fischer titration method. Palm lubricants doped with 0.75 wt% kaolin improved the coefficient of friction and wear rate by 29.5 %, and 43.9 %, respectively. Kaolin nanoparticles doped to palm lubricants were found to reduce wear damage and encourage the development of tribo-films. The oxidation and hydrolytic stability of palm lubricants doped with 0.125 wt% kaolin nanoparticles increased by 21.81 % and 29.5 %, respectively, in comparison to undoped palm lubricants.

Keywords

Surface modification Oleic acid Wear test Hot oil oxidation test Karl Fischer titration method THERMAL-CONDUCTIVITY JATROPHA OIL LUBRICANT NANOPARTICLES BEHAVIOR PERFORMANCE BIOLUBRICANTS NANOLUBRICANT NANOMATERIALS ADDITIVES

WoS Categories

Chemistry, Physical

Citation

Journal: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Year: 2025
Volume: 712
ISSN: 0927-7757
eISSN: 1873-4359
DOI: 10.1016/j.colsurfa.2025.136441
WoS UID: WOS:001429407400001

Open via DOI