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Effect of long-chain alkylamine on the dispersibility and tribological properties of alkyl-graphene in lubricant oil

The experiments confirmed the formation of GO and alkylgraphene. Stably distributed system of alkyl-graphene in SN500 reached 13.2 g/l with octylamine and 9.5 g/l with decylamine and 6.0 g/l with dodecylamine. The lubricating characteristics of lubrication oil containing alkyl-graphene was determined according to ASTM D2783. Evaluation of the reduction performance of SN500 oil when adding with alkyl-graphene: modified GO by octylamine gave the best performance compared to decylamine, dodecylamine. The reduction of abrasion reached 11.3 % at 0.3 g/l and 12.5% at 0.4 g/l of octyl-graphene. | Vietnam Journal of Science and Technology 56 (2A) (2018 ) 163-173 EFFECT OF LONG-CHAIN ALKYLAMINE ON THE DISPERSIBILITY AND TRIBOLOGICAL PROPERTIES OF ALKYL-GRAPHENE IN LUBRICANT OIL Bang Quoc Ha, Anh Duy Nguyen, Van Huu Nguyen* Insitute of Chemistry - Material, Academy of Military Science and Technology, 17 Hoang Sam street, Cau Giay district, Ha Noi, Viet Nam * Email: vanhd2@gmail.com Received: 24 March 2018; Accepted for publication: 13 May 2018 ABSTRACT We report on the preparation of Alkyl-Graphene by hydrothermal method, and their dispersion in lubrication oil. The alkylated graphenes with variable alkyl chain lengths (C n = 8, 12, 18) are prepared by coupling of alkylamine with carboxylic groups of graphene oxide (GO). FTIR, XPS, TGA methods were used to analyze and assess the GO modified ability by amine. The morphology and microstructure of prepared GO and alkyl-graphene were examined using field emission scanning electron microscopy (FESEM), transmission electron microscopy (HRTEM), X-ray diffraction (XRD). The experiments confirmed the formation of GO and alkylgraphene. Stably distributed system of alkyl-graphene in SN500 reached 13.2 g/l with octylamine and 9.5 g/l with decylamine and 6.0 g/l with dodecylamine. The lubricating characteristics of lubrication oil containing alkyl-graphene was determined according to ASTM D2783. Evaluation of the reduction performance of SN500 oil when adding with alkyl-graphene: modified GO by octylamine gave the best performance compared to decylamine, dodecylamine. The reduction of abrasion reached 11.3 % at 0.3 g/l and 12.5% at 0.4 g/l of octyl-graphene. Keywords: graphene oxide, tribology, alkylamine. 1. INTRODUCTION Graphene materials have a layer structure [1], the weak van der Waals interactions between these layers make them can easily slide over each other, so graphene can greatly reduce the abrasion [2, 3]. Based on this characteristic, graphene has been studied as an anti-wear additive in lubricating oils .