Surface‐capped molybdenum sulphide nanoparticles — a novel type of lubricant additive

Bakunin, V. N.; Suslov, A. Yu.; Kuz’mina, G. N.; Vedeneeva, L.M.; Parenago, O. P.; Migdal, Cyril A.; Stott, P.E.

doi:10.1002/ls.3010160302

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…5. The MOS 3 nanoparticles slightly reduced the friction coefficient at comparatively low temperatures (100-140°C), which corresponds to previously published data [11]. ZnDDP combined with nano-MoS 3 causes a more effective decrease in the friction coefficient at 100-120°C.…”

supporting

confidence: 89%

Highly effective friction modifiers from nano-sized materials

Bokarev

Bakunin

Kuz’mina

et al. 2007

Chem Technol Fuels Oils

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Synthesis and the tribological properties of oil-soluble friction modifiers made from surface-modified (lyophilized) nanoparticles of molybdenum trisulfide (nano-MoS 3 ) are described. The synergistic effect of nano-MoS 3 and zinc dialkyldithiophosphate (ZnDDP) is demonstrated. Addition of the latter is effective at high temperatures and low concentrations.The increase in the price of crude and petroleum products has made it necessary to conserve sources of energy. One of the fundamental methods of reducing fuel consumption is to decreases losses to friction in machines and mechanisms by reducing the friction coefficient in contact of metal surfaces.During operation of parts in conditions of boundary or mixed friction, oil-soluble friction modifiers based on molybdenum compounds, of which molybdenum dialkyldithiophosphates and dialkyldithiocarbamates are the best known, are the most promising [1]. The basic drawbacks of these compounds as lube oil additives include the relatively complicated methods of synthesizing them with toxic reagents and the comparatively high price. Recent studies demonstrated the important prospects for use of inorganic nanoparticles as additives that improve the tribological properties of lubricants [2]. For example, a method of obtaining oil-soluble surfacemodified (lyophilized) nanoparticles of molybdenum trisulfide MoS 3 through water-in-oil microemulsions and the antifriction properties of oil compositions with this additive were communicated in [3][4][5].We report the results of a study of the tribological properties of nanoparticles of MoS 3 obtained by thermal decomposition of ammonium dithiomolybdate in a hot amphiphilic matrix at 100-160°C [6,7]. The proposed method of synthesis is distinguished by comparative simplicity and processability; combined with an important decrease in the cost of the product, these attributes enhance the prospects for its practical use. Tetraalkylammonium salts were used as the amphiphilic matrix. The exchange reaction takes place in the first stage of synthesis:

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confidence: 89%

Highly effective friction modifiers from nano-sized materials

Bokarev

Bakunin

Kuz’mina

et al. 2007

Chem Technol Fuels Oils

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“…57,58 using an SRV tribometer and a Cameron-Plint TE77 high-frequency friction machine. 56 The Chinese group compared the friction coefficient reduction and antiwear properties of synthesised MoS clusters in a paraffin oil with a zinc dialkyldithiophosphate (ZnDTP)type additive, and demonstrated that both antifriction and antiwear properties are significantly improved by the use of the nanoparticle-based s~bstance.~'…”

Section: Tribological Properties and Mechanism Of Actionmentioning

confidence: 99%

Recent achievements in the synthesis and application of inorganic nanoparticles as lubricant components

Bakunin

Suslov

Kuz’mina

et al. 2005

Lubrication Science

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Recent advances made in the chemistry and technology of nano‐metric inorganic particles allow the synthesis of various metal oxides, chalcogenides, phosphates, and so on. Surface modification of nanoparticles in some cases allows the formation of stable dispersions in liquid hydrocarbons. The state of the art in the field of inorganic nanoparticle synthesis and their application in tribology are discussed in this paper. Special attention is paid to the synthesis of surface‐capped and bare molybdenum sulphide nanoparticles and to the testing thereof as friction‐modifying additives for liquid lubricants. Differences in the mechanism of action of MoSx nanoparticles and molecular molybdenum complexes (e.g., molybdenum dithiocarbamate) are discussed. Future trends in the use of inorganic nanoparticles as lubricant additives are suggested.

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“…Nevertheless, for the alteration of friction and wear rate, sliding speed and normal load are considered to be of paramount importance. Similarly, it has been found that the friction force is a function of both velocity and time of contact and that the coefficient of friction may be very low for very smooth surfaces and/or at loads in the micro-to nano-newton range [14,15]. Therefore, some authors have explored lubricants and have proposed them to be potential mediators for reducing friction and wear of the mating surfaces [16][17][18].…”

Section: Introductionmentioning

confidence: 98%

Experimental results of the tribology of aluminum measured with a pin-on-disk tribometer: Testing configuration and additive effects

et al. 2016

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The friction coefficient, wear rate, and wear coefficient of the aluminum metal surface were measured at room temperature (≈300 K) with a pin-on-disk machine at a fixed load of 196.2 N. Two different testing configurations were adopted: (1) aluminum pin vs. Helix oil-on-steel disk (AHS) and (2) aluminum pin vs. 10% Polytron plus 90% helix oil-on-steel disk (APS). In the AHS configuration, the wear of the aluminum surface was found to be approximately 70 μm; however, in the APS configuration the wear dropped to 20 μm, revealing a marked decrement of one-third of the wear of aluminum. The volume wear rate of the metal in the unaided Helix oil was estimated to be 1.28×10 -3 mm 3 /min. The additive minimized the volume wear rate of the aluminum metal by orders of magnitude to 6.08×10 -5 mm 3 /min. Similarly, the wear coefficient of the aluminum pin, calculated in the AHS configuration, rendered a value of 1.27×10 -10 m 2 /N. In the APS configuration, the same parameter was 4.22×10 -11 m 2 /N, that is to say, an order of magnitude lower than the preceding value. The observed coefficient of friction for aluminum is 0.012 in Helix oil and falls to a remarkably lower value of 0.004 through the Polytron additive. The experimental findings demonstrate that Polytron additive substantially lessens the wear of the aluminum surface; in effect, the wear coefficient and the wear rate decline linearly. This singularity may be linked to the ability of Polytron to impregnate the crystal structure of the metal due to its ionic character and the consequent adherence to the metallic surface as a hard surface layer.

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Surface‐capped molybdenum sulphide nanoparticles — a novel type of lubricant additive

Cited by 14 publications

References 11 publications

Highly effective friction modifiers from nano-sized materials

Highly effective friction modifiers from nano-sized materials

Recent achievements in the synthesis and application of inorganic nanoparticles as lubricant components

Experimental results of the tribology of aluminum measured with a pin-on-disk tribometer: Testing configuration and additive effects

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