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Reduction of the Coefficient of Friction of Steel-Steel Tribological Contacts by Novel Graphene-Deep Eutectic Solvents (DESs) Lubricants

Surface Engineering, Corrosion and Durability Department, National Centre for Metallurgical Research (CENIM-CSIC), Avda. Gregorio del Amo 8, E28040 Madrid, Spain
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Lubricants 2019, 7(4), 37; https://doi.org/10.3390/lubricants7040037
Received: 26 March 2019 / Revised: 16 April 2019 / Accepted: 20 April 2019 / Published: 24 April 2019
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Abstract

Deep eutectic ionic liquids (DES) possess similar properties to conventional ionic liquids (ILs). However, ILs cannot be considered as environmentally friendly compounds due to both its processing and synthesis, which could have significant polluting effects. On the contrary, deep eutectic solvents (DESs) can be biodegradable, non-toxic, and have a lower price than most ILs, making them potentially useful in a wide variety of advanced technological applications, such as tribology. On the other hand, graphene has recently been proposed as an extremely promising lubricant due to its combination of mechanical properties and chemical stability as well as its “green” character. In the present paper, graphene flakes (≈250 nm) have been used as an additive to DES composed of choline chloride (ChCl)-urea, ChCl-ethylene glycol, and ChCl-malic acid. According to the results, the addition of 1 wt% graphene reduces friction coefficient (COF) and, notably, prevents adhesive wear, reducing wear rate on steel-steel sliding contacts. View Full-Text
Keywords: carbon nanomaterials; graphene; friction and wear mechanisms; steel; deep eutectic solvents; ionic liquids carbon nanomaterials; graphene; friction and wear mechanisms; steel; deep eutectic solvents; ionic liquids
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Garcia, I.; Guerra, S.; de Damborenea, J.; Conde, A. Reduction of the Coefficient of Friction of Steel-Steel Tribological Contacts by Novel Graphene-Deep Eutectic Solvents (DESs) Lubricants. Lubricants 2019, 7, 37.

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