Red phosphorus (P) was covalently attached to graphene nanosheets (Gr) using high-energy ball-milling under a nitrogen atmosphere. Benefiting from the formation of phosphate and P-O-C bonds on surfaces, resulting phosphorus-graphene (P-Gr) hybrids exhibited excellent dispersion stability in polyalkylene glycol (PAG) base oil compared with graphene. Moreover, tribological measurement indicated that addition 1.0 wt% P-Gr into PAG resulted significant reduction friction coefficient (up about...

A series of 3-arylthio-1,3-disubstituted-oxindoles were prepared in good yields by the reaction α-diazocarbonyl compounds and sulfenamides. The involves a Rh-catalyzed thia-Sommelet−Hauser-type rearrangement.

Herein, MoS2 nanosheets (MoS2) densely modified with n-octadecyl mercaptan (NOM) are used as effective friction-reducing and antiwear additives. A facile green strategy is employed to prepare the organic–inorganic hybrid (MoS2–NOM) by mussel-inspired chemistry combining Michael addition reaction. When MoS2–NOM added in poly-α-olefin (PAO) 10, they form a homogeneous stable dispersion compared unmodified MoS2. Tribological measurements show that of PAO 10 containing 1 wt % displays dramatic...

Abstract Herein, molybdenum disulfide (MoS 2 ) and tungsten (WS quantum dots (QDs) are prepared by a facile green technique, characterized microscopy spectroscopy. The resulting products display exceptional stability in polyalkylene glycol (PAG) base oil, used for the first time as friction reducing antiwear additives PAG steel/steel contact. Tribological measurements indicate that stable dispersion consisting of mixed with MoS /WS QDs exhibits significant tribological properties compared...

The epidemic of Coronavirus Disease 2019 (COVID-19) has become a global health emergency, but the clinical characteristics COVID-19 are not fully described. We aimed to describe outside Wuhan city; and develop multivariate model predict risk prolonged length stay in hospital (ProLOS).

Abstract In this study, the nanocomposites of MoS 2 nanoparticles (NPs) grown on carbon nanotubes (MoS @CNT), graphene @Gr), and fullerene C60 @C60) were synthesized, characterized, evaluated for potential use as lubricant additives. By using benefit synergistic effect between nanomaterials (CNMs), these can be well dispersed in polyalkylene glycol (PAG) base oil show superior stability compared with pure NPs. Moreover, dispersions @CNT, @Gr, @C60 added PAG have noticeably improved friction...

Nanosized MoS₂ on graphene was firstly investigated in the lubrication field and exhibited excellent tribological performance perfluoroalkylpolyether under high vacuum.

Despite excellent tribological behaviors of ionic liquids (ILs) as lubricating oils, their friction-reducing and anti-wear properties must be improved when they are used under severe conditions. There only a few reports exploring additives for ILs. Here, MoS2 WS2 quantum dots (QDs, with particle size less than 10 nm) prepared via facile green technique, dispersed in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm]PF6), forming homogeneous dispersions exhibiting long-term stabilities....

There is an urgent need to prepare high-performance tribological additives for water-based lubricants by a sustainable approach. Herein, we fabricated dextran-modified molybdenum sulfide nanoparticles (MoS2-dex NPs) ball-milling in nitrogen atmosphere. In addition the exceptional water dispersion stability of MoS2-dex, substantial reductions both friction coefficient and wear were observed adding MoS2-dex glycerol solution. Moreover, performance graphene oxide (GO) mixture outperformed that...

The tribological behaviors of hydroquinone bis(diphenyl phosphate) (HDP) and tricresyl phosphate (TCP) for polyalkylene glycol (PAG) were evaluated at 200 °C. Results showed that HDP could effectively reduce the friction coefficient prevent wear sliding pairs during test. best properties achieves concentration 4 wt %. At this level, volume lower disk can be reduced by a factor 2.4 load-carrying capacity increase from 500 N to 930 N, with respect pure PAG. Furthermore, exhibited better...

In situ formed ionic liquids (ILs) as high temperature lubricants can be obtained by mixing polyol esters (pentaerythritol oleate or trihydroxymethylpropyl trioleate) with lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) in molar ratios of 1/0.5, 1/1 and 1/1.5. Thermal rheological analysis indicate that the ILs, [Li(polyol ester)]TFSI, various are more resistant to temperatures substantially stronger than ester base oils. Tribological results revealed these forming ILs 1/1.5 possessed...

The alkylphenyl diphosphates pentaerythritol tetrakis(diphenyl phosphate) (PDP) and trimethylolpropane tris(diphenyl (TDP) were evaluated as the antiwear additives in lithium complex grease polyurea at 200 °C. results indicated that both may effectively reduce sliding friction wear compared to base greases. tribological performances generally better than normally used molybdenum disulfide (MoS2)-based additive package also grease. Boundary lubrication films composed of Fe(OH)O, Fe3O4, FePO4,...

Castor oil tris(diphenyl phosphate) (CODP) was synthesized using an environmentally friendly resource – castor (CO), and its tribological properties were evaluated in lubricating greases at 150 °C.

Naphthyl phenyl diphosphates: 1-naphthyl diphenyl phosphate (NDP) and 1,5-dihydroxynaphthalene bis(diphenyl phosphate) (DDP) were evaluated as the antiwear additives in polyalkylene glycol polyurea grease at 200 °C. Results showed that they could effectively reduce friction wear of sliding pairs compared with cases without these additives. Furthermore, tribological properties NDP DDP generally better than normally used tricresyl (TCP) PAG molybdenum disulfide (MoS2) grease. Boundary...

Abstract The tribological performances of perfluoroalkylpolyethers (PFPE) with graphene (Gr), WS 2 , and the mixture Gr (Gr + ) before after ultraviolet (UV), atomic oxygen (AO), proton (Pr) irradiations were investigated. composition structure PFPE, Gr, also analyzed to understand effects irradiation on behaviors PFPE additives. results indicated that serious deterioration degradation took place was transformed amorphous carbon Pr irradiation, surface oxidation occurred under AO Pr....

We report the first synthesis of a high-performance lubricant additive by grafting treelike polymeric phosphate esters (PPEs) onto graphene oxide (GO) nanosheets.