Ceria/reduced Graphene Oxide Nanocomposite: Synthesis, Characterization, and Its Lubrication Application

Abstract

Reduced graphene oxide nanosheet decorated with uniform ceria (CeO2) nanoparticles was prepared via a simple hydrothermal method. The anchored CeO2 nanoparticles with diameters of 3.5‐4.5 nm were well distributed on reduced graphene oxide (rGO) nanosheets. The as‐prepared CeO2/rGO nanocomposites can be highly dispersed into the paraffin oil to form a stable monodisperse solution at the broad temperature range from −7°C to 160°C. The tribological performance of CeO2/rGO nanocomposites as oil lubricant additives was systematically investigated using a MS−T3000 ball‐on‐disk tester. The results indicated that paraffin oil with 5 wt% CeO2/rGO exhibited the best lubrication performance in terms of the lowest friction coefficient and wear rate compared to only GO or CeO2 nanoparticles as lubricant additives. Notably, the base oil filled with CeO2/rGO revealed the excellent tribological properties as friction coefficient and wear rate separately decreased by 15.85% and 76.03%, in comparison with the base paraffin oil. Moreover, optical microscope images of the wear surface of the steel disc as well showed that CeO2/rGO nanocomposites exhibited higher anti‐wear capability than GO nanosheet and CeO2 nanoparticles. The unique tribological properties of CeO2/rGO suggested the synergistic friction reduction and anti‐wear mechanism of rGO nanosheet and CeO2 nanoparticles.

TiO2 and CeO2 nanoparticles as lithium complex grease additives for enhanced lubricity

“…At the same time, larger-sized CeO 2 nanoparticles transform sliding friction between the friction pairs into rolling friction on the steel ball surface. These nanoparticles can reduce direct collisions and contact between the steel balls, reduce the friction coefficient and decrease the generation of high-stress points, thereby improving the wear resistance of the lithium complex grease (Min et al , 2019). Additionally, nano-CeO 2 promotes the oxidation reaction of the steel ball surface during friction, forming a deposited film containing metal oxides such as Fe 2 O 3 , Fe 3 O 4 and Ce 2 O 3 , which protect the worn surface.…”

Biomimetic Synthesis of Copper/Polydopamine‐Functionalized Oxygenated Carbon Nitride Composites and Their Application as Lubricants

“…In order to improve the tribological properties of lubricating oil further, filling it with different nanomaterials, such as Cu NPs, MoS 2 and GO, is an effective and convenient way. In recent years, more and more layered materials have been used in lubricants, for example, hexagonal boron nitride (H‐BN), MoS 2 , graphite and GO . These researches accelerated the development of new two‐dimensional (2D) lubricating materials.…”

Effect of Argon Flow Rate on Tribological Properties of Rare Earth Ce Doped MoS2 Based Composite Coatings by Magnetron Sputtering

“…Doped metals can usually prevent further oxidation inside the coating by preferential oxidation. Cerium oxide also inhibits grain growth, coarsening in the material, and assisting lubrication [44,45]. The surface of the samples was scanned by XPS, and the spectra of Mo 3d, S 2s, Ce 3d, and Ti 2p orbitals are analyzed, as shown in Figure 4.…”