Preparation and Tribological Properties of Lanthanum Trifluoride Nanoparticles-Decorated Graphene Oxide Nanosheets

Abstract

Graphene oxide (GO) nanosheets were decorated with lanthanum trifluoride (LaF 3 ) nanoparticles by a simple solution method to afford LaF 3 −GO nanohybrids, with which ammonium fluoride and lanthanum nitrate were used as raw materials to synthesize LaF 3 nanoparticles. As-prepared LaF 3 −GO nanohybrids were characterized by X-ray diffraction, Raman spectrometry, transmission electron microscopy, and Fourier transform infrared spectrometry. Moreover, the thermal stability of the as-prepared LaF 3 −GO nanohybrids was evaluated by thermogravimetric analysis, and their tribological properties as an additive of distilled water were evaluated with a four-ball friction and wear tester. It was found that LaF 3 nanoparticles are integrated with the GO nanosheets through electrostatic interaction thereby affording LaF 3 −GO nanohybrids. In addition, when the as-prepared LaF 3 −GO nanohybrid was added into distilled water at an optimum mass fraction of 1.5%, it was able to significantly improve the tribological properties of distilled water. This is because LaF 3 −GO nanohybrids can be deposited on rubbed steel surfaces to form protective and lubricious layers consisting of GO, LaF 3 , Fe 2 O 3 , and FeF 3 , thereby significantly reducing the friction and wear of the steel−steel contact under water lubrication.

Synthesis and tribological behaviour of oleic acid‐capped lanthanum borate/graphene oxide nanocomposites

“…The spectrum of LB/GO reveals a strong G band at ~1600 cm −1 belonging to the characteristic peak of the in‐plane vibration of a layer of sp 2 carbon atoms and a weaker D band at around ~1360 cm −1 coming from the defects or imperfections. These peaks belong to the typical feature spectra of GO . More importantly, as reflecting a measure of disordered carbon, the I D /I G intensity ratio of GO is 0.82, whereas the I D /I G values of LB/GOA (0.66), LB/GOB (0.71) and LB/GOC (0.73) are lower than that of GO.…”

“…These peaks belong to the typical feature spectra of GO. 17,18 More importantly, as reflecting a measure of disordered carbon, 19 the I D /I G intensity ratio of GO is 0.82, whereas the I D / I G values of LB/GOA (0.66), LB/GOB (0.71) and LB/GOC (0.73) are lower than that of GO. This is as a result that the presence of LB nanoparticles on the surface of GO contributes to the 3D structure of GO.…”

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

“…Besides, the content of carbon and oxygen element of Figure c and Figure d also changed, which reveals that GO nanosheets or CeO 2 nanoparticles can be transferred onto the contact zone of rubbing steel disc under the compressive stress. It generates tribofilm on the rubbing steel surfaces, thereby preventing the direct steel‐steel contact and reducing the friction and wear . Under the contact stress, GO nanosheets decorated with CeO 2 nanoparticles can fill up the nanogaps of the rubbing surfaces and prevent the direct contact.…”

“…It generates tribofilm on the rubbing steel surfaces, thereby preventing the direct steel-steel contact and reducing the friction and wear. [42] Under the contact stress, GO nanosheets decorated with CeO 2 nanoparticles can fill up the nanogaps of the rubbing surfaces and prevent the direct contact. Based on the synergistic lubrication effect of GO and CeO 2 nanoparticles on the interface, the CeO 2 /rGO nanocomposites exhibit the excellent friction-reducing and anti-wear properties.…”

Synergistic Tribo-Activity of Nanohybrids of Zirconia/Cerium-Doped Zirconia Nanoparticles with Nano Lamellar Reduced Graphene Oxide and Molybdenum Disulfide

“…The small size of nanomaterials triggers fast tribological action at the surface while their chemical stability minimizes emissions [8][9][10]. Wide varieties of nanoparticles, like metal oxides, metal sulphides, metal halides, and carbon-based materials, have been reported in the literature as lubricant additives [11][12][13][14][15][16]. Doping by some different metal in the host lattice of a metal salt has yielded enhanced tribo-performance due to the formation of defects [17][18][19].…”