Abstract Low‐temperature properties need improvement before vegetable oils can receive wider recognition as biodegradable lubricants. Effects of dilution with major fluids, namely poly alpha olefin (PAO 2), diisodecyl adipate (DIDA), and oleates, well impact pour point depressant (PPD), were investigated. Since solidification mixed unsaturated triacylglycerols is a complex thermodynamic process, the study was limited to determinations. Vegetable demonstrated higher points increased...

Quality control and non-destructive monitoring are of notable interest food pharmaceutical industries. It relies on the ability non-invasive inspection which can be employed for manufacturing process control. We hereby apply terahertz (THz) time-domain spectroscopy as technique to monitor pure degraded oils well hydrocarbon chemicals. Significant differences in spectra refractive index (RI) absorption coefficient arising from presence ester linkages edible technical were obtained. Explicit...

Many studies focus on nanoparticles as lubricity additives but overlook the fact that wear produces nanosized debris during field use. In order to simulate fine metal contaminants, which are most widespread in various applications, prefabricated Fe, Cu and Zn were used. Their 0.01–1% suspensions vegetable mineral oils with or without ZDDP ashless AW package tested four-ball under 150-N load. Tribological effects of not significant formulations additives. However, nanoFe addition produced...

Recent advances in ceramic materials, particularly porous alumina (Al2O3), have significantly enhanced the safety and efficacy of medical implants by improving biocompatibility modulating cellular behavior for biomedical applications. Variations surface structure chemical composition Al2O3 promote different biological responses coating stability, underscoring need further corrosion research. Traditional methods producing ceramics from powder are expensive, time-consuming, limited their...

Twist compression tribotester (TCT) and 4-ball extreme pressure (EP) methods were used to investigate commercial polysulfide (PS) biobased polyester (PE) EP additives in paraffinic (150N) refined soybean (SOY) base oils of similar viscosity. Binary blends additive oil investigated as a function concentration. In addition weld point (WP), produced set preweld data, notably peak torque wear scar diameter, which found correlate with WP results. TCT gave 5-fold larger time-to-failure (TTF) for...

We investigate the mechanism of self-assembly fatty acids (FA) and methyl oleate on an Al oxy-hydroxide surface with a view to deciphering role nature interfacial processes (adsorption, chemical binding, molecular organization, etc.). For this purpose, we focus parameters related intrinsic properties molecules, namely level unsaturation head group (carboxylic acid or ester). After FA adsorption, presence coordinative bonded carboxylate species is demonstrated by means PM-IRRAS analysis....

Metal particles, suspended as wear debris or additives, have a major influence on lubrication technology. They are known mostly for negative roles, but even iron nanoparticles, which likely to pass through most filters, not yet been quantitatively evaluated their effects friction and wear. In this study copper nanoparticle suspensions were formulated in high sulphur paraffinic mineral oils food grade rapeseed oil. The suspension stabilisation mechanism based steric repulsion appeared more...

The self-assembly of fatty acids (FA) on the surfaces inorganic materials is a relevant way to control their wetting properties. While mechanism adsorption model flat substrate well described in literature, interfacial processes remain poorly documented nanostructured surfaces. In this study, we report variety FA hydroxylated Al surface which exhibits random nanoscale organization. Our results revealed peculiar fingerprint due consists formation aligned nanopatterns state hierarchical...

The enzymatic degradation of various solvent-based polyurethane adhesives by cutinase from Humicola insolens (HiC) is assessed.

Abstract Blending is often used to reduce the viscosity of vegetable oil lubricants. Experimental rheological results were compared with traditional blending charts and calculation methods. Kinematic viscosities 90% oleic sunflower, canola, soybean oils blended adipates, oleates, polyalphaolefins, mineral determined at 40°C using capillary viscometers. related blend composition 5% inaccuracy more than 10% deviation made by cubic equation Kendall Monroe. Even accurate simpler correlations...

Abstract A thin‐film oxidation test was developed to investigate liquid oxypolymerization of nonvolatile analytes. Gel permeation chromatography (GPC) showed that the delivered required degree with better than ±5% accuracy. The following oils were ranked according their decreasing resistance oxypolymer formation at 150°C: 90% oleic sunflower oil, triolein, meadowfoam castor canola lesquerella and soybean oil. Higher degrees demonstrated occurrence oxidative gelation. Oxypolymerization...

Purpose Workmanship concerns lead to more focus on volatile materials, released by industrial lubricants. Typically, flash point test and thermo‐gravimetrical analysis (TGA) are used investigate basestock volatility, but they do not address long‐term decomposition tendencies of The extent losses due chemical degradation (oxidation, hydrolysis, dissociation, etc.) remains unclear. Design/methodology/approach Vaporisation eight additive‐free bio‐based, synthetic mineral basestocks with similar...

Herein, we report the coating of a surface with random nanoscale topography lipid film formed by an anchoring stearic acid (SA) monolayer and phospholipid (DPPC) layers. For this purpose, different procedures were used for coating, including adsorption from solution, drop deposition, spin-coating. Our results reveal that morphology obtained films is strongly influenced underlying substrate but also impacted other factors, procedure wettability (modulated presence SA). These coated surfaces...

Effectiveness of lubricity additives in base oils from renewable resources is often different than that mineral oils. Low erucic Rapeseed Oil (RO) and Lard oil Methyl Esters (LME) were fortified with commercial ash-less additives. A fully formulated additive package S, P N containing enhancers other func-tional ingredients was evaluated along two commer-cial high molecular weight esters Four Ball tribotester. Without additives, both showed poor antiwear proper-ties. However, after selecting...

Amorphous Fe-W alloys with 25 at.% of W were electrodeposited under direct and pulse modes from glycolate-citrate bath without addition polyethylene glycol. The tribological behavior the coatings was studied at 1, 2 5 N loads dry friction in presence rapeseed oil films 0.2-5.0 m thickness. obtained reveals their severe tribo-oxidation resulting a high wear depth coefficient friction. Observed groove like surface well-adhered particles inside track point out on abrasive-adhesive mechanism...

Biodiesel plants are struggling to find value added applications for fatty acid methyl esters (FAME). One option FAME valorization would be dibasic esters, which can transesterified with 2-ethylhexyl (2EH) or other alcohols produce lubricant basestocks and achieve the most widespread viscosity grades VG46 VG32. Biocatalytic, metathesis synthetic pathways available esters. Using a ruthenium-based catalyst, oleate was converted into monounsaturated ester by reached VG22 after...