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Synthesis of nanostructured flower-like MoS 2 and its friction properties as additive in lubricating oils

2016; Emerald Publishing Limited; Volume: 68; Issue: 6 Linguagem: Inglês

10.1108/ilt-12-2015-0194

1758-5775

Gustavo Tontini, Guilherme Dalla Lana Semione, Cristian Bernardi, Roberto Binder, José Daniel Biasoli de Mello, V. Drago,

Adhesion, Friction, and Surface Interactions

Purpose This paper aims to synthesize nanostructured flower-like molybdenum disulphide (MoS 2 ) particles and evaluate their suitability to act as additives for lubricants. Design/methodology/approach A hydrothermal method without any surfactant successfully produced 250 nm mean diameter Nanostructured flower-like MoS 2 particles. The resulting product was then solvothermally treated with absolute ethanol producing lipophilic powder particles which after being dispersed in two different lubricants were tribologicaly characterized by using a pin-on-disk tribometer geometry with reciprocal movement under immersion. Findings The influence on the stability and the coefficient of friction of the nano-oils is shown to be strongly dependent on their molecular structure. After 1 h of tribological testing, a ramified polyolester oil with 1 Wt.% of MoS 2 nanoflowers did not show decrease in its average coefficient of friction, while an additive naphthenic oil with the same concentration of nanoparticles showed a decrease of 86 per cent. Originality/value In this paper, nanostructured flower-like MoS 2 synthesized by the hydrothermal method was dispersed in lubricating oils to study its stability and tribological properties. To ensure good stability of the nano-oils, the particles were solvothermally treated with absolute ethanol to dehydrate and lipophilize them. A ramified polyolester-based nano-oil with 1 Wt.% of MoS 2 nanoflowers showed no decrease in its steady state coefficient of friction, while a naphthenic-based nano-oil with the same concentration of nanoparticles presented a remarkable 86 per cent reduction.