The effect of particle size on the dispersion and wear protection ability of MoS₂ particles in polyalphaolefin and trimethylolpropane ester

Abstract

The effect of particle size and surfactant on dispersion stability and wear protection ability was experimentally evaluated for polyalphaolefin (PAO 10) and bio-based base oil (palm trimethylolpropane ester) added with molybdenum disulfide (MoS 2) particles. Nanolubricants were developed by adding 1 wt% of MoS 2 particles that varied in size. In addition to the variation in particle size, an anionic surfactant was also used to analyze its interaction with both types of nanoparticles for stable suspensions and for the related effects on the antiwear characteristics. The wear protection characteristics of the formulations were evaluated by four-ball extreme pressure tests and piston ring on cylinder sliding wear tests. The wear surfaces were analyzed by scanning electron microscopy along with an energy-dispersive X-ray and an atomic force microscopy. The MoS 2 nanoparticles with a nominal size of 20 nm exhibited a better load-carrying capacity, while better sliding wear protection was provided by nanoparticles with a nominal size of 50 nm.

A Glimpse of the World of Volatile Fatty Acids Production and Application: A review

“…The pollutant level in the anaerobic digester effluent was significantly reduced. A similar result was reported as constructed wetlands lowered the concentrations of COD (89%) and turbidity (99%), but inhibition of algal biomass growth was observed due to physico-chemical characteristics of the wastewater [ 245 ]. High concentrations of certain nutrients such as ammonium (5–11 mM) can be toxic to the plants whose tolerance levels differ among species [ 246 , 247 ].…”

Impact of Ionic Liquid Additives and Inorganic Fullerene-Like Tungsten Disulfide on Friction and Wear under Aqueous Environments

“…The IF-WS 2 nanoparticles had a size range of 70–210 nm obtained through AFM scans. This includes a range of particle sizes, where larger particles settle faster and smaller particles remain suspended for longer durations . To observe the dispersion stability of IF-WS 2 , the absorbance of the samples was investigated using a UV–vis–NIR spectrometer.…”

“…This includes a range of particle sizes, where larger particles settle faster and smaller particles remain suspended for longer durations. 32 To observe the dispersion stability of IF-WS 2 , the absorbance of the samples was investigated using a UV−vis−NIR spectrometer. To this end, we obtained the UV−vis spectra of different samples, from which the peak absorption at 420 nm wavelength, which is assigned to the A 1g mode of IF-WS 2 , was traced to find the relative concentration of the prepared samples with respect to the first day, and the decrease in absorbance was recorded with time.…”

Experimental studies on viscosity, thermal and tribological properties of vegetable oil (kapok oil) with boric acid as an additive

“…In order to reduce friction and wear, various additives were added in the lubricating oil [15]. The various additives like calcium borate nanoparticles [16], lanthanum borate [17], multiwalled carbon nanotube (MWCNT) [18], CeO 2 /CuO, graphite [19], ZDDP, CuO, TiO 2 , Silicon dioxide (SiO 2 ) and molybdenum disulphide (MoS 2 ) [20] were used to reduce friction and wear rate between two interfacing surfaces. Over a period of 30 years, boric acid was used as additives in solid lubricant to reduce the friction and wear during the sliding contact [21].…”