Influence of the Organic Moiety on the Tribological Properties of MoS 2 :Glycol Hybrid Nanoparticles-Based Dispersions
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ORIGINAL PAPER
Influence of the Organic Moiety on the Tribological Properties of MoS2:Glycol Hybrid Nanoparticles‑Based Dispersions I. García1 · J. Galipaud2 · I. Kosta1 · H. Grande1 · E. Garcia‑Lecina1 · F. Dassenoy2 Received: 2 July 2020 / Accepted: 17 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract MoS2:glycol hybrid nanoparticles were synthetized through a polyol route. Their tribological properties when used as lubricant additives in a PAO 6 base oil were investigated using a pin-on-disk tribometer. An important friction reduction and good anti-wear performances were observed compared to the base oil and to the no modified particles. The M oS2:glycol nanoparticles were characterized by thermogravimetric analysis, transmission electron microscopy, RAMAN spectroscopy, X-ray diffraction, and Fourier transform infrared. Furthermore, the stability of the dispersion was followed by dynamic light scattering. On the other hand, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and X-ray Photoelectron Spectrometry analysis showed that the tribofilm formed on the wear surfaces during the friction test is at the origin of the excellent tribological performance of the M oS2 nanoparticles. In particular, it was demonstrated that the interaction of MoS2 with the organic moiety of the nanoparticles plays a key role in the friction reduction and the good anti-wear properties of the dispersions. Keywords MoS2 · Hybrid nanoparticles · Lubricants · Tribofilm
1 Introduction Many of the commonly used solutions for decreasing the friction and wear rely on the application of a lubricating fluid formulated using chemically based tribological additives. These additives are tribochemically activated in the contact and react with the surfaces to form a protective tribochemical film. However, several commonly used additives, like Molybdenum DiThioCarbamate (MoDTC), Zinc DiThio-dialkyl-Phosphate (ZDDP), and others, are at the origin of undesired emissions involving P, S, and Zn and particularly noxious for the environment [1–6]. Moreover, the functionality of these additives is becoming increasingly Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11249-020-01345-2) contains supplementary material, which is available to authorized users. * I. García [email protected] 1
CIDETEC, Basque Research and Technology Alliance (BRTA), P° Miramón, 196, 20014 Donostia‑San Sebastián, Spain
Ecole Centrale de Lyon, LTDS. 36, Avenue Guy de Collongue, 69134 Ecully Cedex, France
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limited because they were tailored to be used mainly with steel surfaces and cannot provide an optimal lubrication performance for the newly developed engineering materials, such as hard surface coatings, ceramics, or polymers. Moreover, their use is also limited to a narrow range of operating temperatures. They are not efficient at low contact temperature because they need to be thermally activated but if the temperature is too high
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