Synthesis of nanostructured lanthanum fluoborate modified by oleylamine and evaluation of its tribological properties as a lubricating additive in synthetic ester

Abstract

Lanthanum fluoborate modified by oleylamine [denoted as La(BF4)3‐OA] was synthesized as a potential lubricant additive by direct precipitation method with sodium tetrafluoroborate and lanthanum nitrate [La(NO3)3] as the staring materials and oleylamine (OA) as the surface‐modifying agent in distilled water‐ethanol mixed solvent. The effects of reaction temperature, OA to La(NO3)3 ratio, and surfactant cetyltrimethyl ammonium bromide on the size and shape of as‐synthesized La(BF4)3‐OA were investigated. The crystalline structure and morphology of as‐obtained La(BF4)3‐OA were characterized by X‐ray diffraction, transmission electron microscopy, Fourier transform infrared spectrometry, and X‐ray photoelectron spectroscopy. Moreover, the tribological properties of La(BF4)3‐OA as an additive in dioctyl sebacate, a synthetic ester, were evaluated with a four‐ball machine, and the worn surfaces of the steel balls were analyzed with a field emission scanning electron microscope equipped with an energy dispersive spectrometer accessory. It was found that the as‐synthesized La(BF4)3‐OA exhibits disk‐like nanoflake shape and have a diameter of 10–45 nm, depending on varying synthetic conditions. As‐synthesized La(BF4)3‐OA as an additive in DIOS possesses excellent antiwear and friction‐reduction performance for the steel–steel pair, which is because the as‐synthesized additive simultaneously contain tribologically active elements La, B, and F that facilitate the formation of a boundary lubricating and protecting film on sliding steel surfaces thereby avoiding direct contact of the steel–steel pair and significantly reducing the friction and wear. Copyright © 2016 John Wiley & Sons, Ltd.

Ternary Composite of Methionine-Functionalized Graphene Oxide, Lanthanum-Doped Yttria Nanoparticles, and Molybdenum Disulfide Nanosheets for Thin-Film Lubrication

“…The deconvoluted core-level spectra of C 1s, O 1s, N 1s, S 2p, Mo (3d 5/2 and 3d 3/2 ), Y (3d 5/2 and 3d 3/2 ), and La are depicted in parts b–h of Figure , respectively. Several peaks are observed in the C 1s spectrum (Figure b) at binding energies of 284.7, 285.3, 285.9, 286.8, 287.8, and 289.5 eV, which could be attributed to CC, C–O, C–N, C–S, CO, and −NH–CO bonds of M-rGO. ,,, The spectrum of O 1s (Figure c) exhibits three peaks for M–O bonds of metal oxides [Y–O and La–O], CO, and C–O at 529.7, 530.8, and 531.8 eV, respectively. ,, In the N 1s spectrum (Figure d), two peaks are observable at binding energies of 397.6 and 400.9 eV corresponding to C–NHR and C­(O)–NH–R, respectively, confirming reaction of the −NH 2 group of methionine with the epoxide ring and carboxylic group of GO . The S 2p spectrum (Figure e) displays peaks at 161.2, 162.7, and 164.3 eV according to S 2p 3/2 , S 2p 1/2 , and C–S, respectively. , In the spectrum of molybdenum (Figure f), Mo 3d 5/2 , and Mo 3d 3/2 could be allocated at 228.6 and 231.8 eV, respectively.…”

“…8 The spectrum of the ternary nanohybrid exhibits these modes with reduced intensity (Figure S3c). The spectrum of M-rGO, shown as an inset in Figure S3c, exhibits intense peaks at 1347.5 and 1573.4 cm −1 , ascribed to the D 43,57,63 In the N 1s spectrum (Figure 4d), two peaks are observable at binding energies of 397.6 and 400.9 eV corresponding to C− NHR and C(O)−NH−R, respectively, confirming reaction of the −NH 2 group of methionine with the epoxide ring and carboxylic group of GO. 19 The S 2p spectrum (Figure 4e) displays peaks at 161.2, 162.7, and 164.3 eV according to S 2p 3/2 , S 2p 1/2 , and C−S, respectively.…”

Preparation of Cu@SiO2composite nanoparticle and its tribological properties as water‐based lubricant additive

“…Early in 1994, we found that MoS 2 nanoparticles as a lubricant additive can effectively reduce the friction and wear of steel‐steel sliding pair . Since then, various inorganic nanoparticles, including oxide nanoparticles, metal nanoparticles, and other nanostructures have been tested to improve the tribological properties of lubricating oils . Copper is widely used as a solid lubricating material and polymer‐based self‐lubricating filler because of its good ductility, low hardness and shear strength.…”

Novel phenylboronic acid derivatives containing phosphorous and nitrogen as lubricant additives: Synthesis, characterization, and tribological behaviors

“…[21][22][23] Some boroncontaining nanoparticles as environmentally friendly inorganic lubricant additives have an enormous application range in comparison with the traditional organic lubricating oil additives since they have excellent tribological properties. [24][25][26][27] Zhao et al 28 reported that the surface functionalized zinc borate incorporated into the liquid paraffin showed superior anti-wear property. In addition, boron nitride nanoparticles as potential lubricating oil additives have attracted considerable attention due to its excellent lubricating properties, superb oxidation resistance, high thermal stability, and environmental friendliness.…”