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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