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Inorganic fullerene-like (IF) MoS 2 nanoparticles with diameters ranging from 70 to 120 nm were synthesized by desulphurizing the MoS 3 precursor and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Tribological properties of the IF-MoS 2 , as lubricating oil additive, were evaluated using a MMW-1 four-ball tribotester. The wear scar was examined with an optical microscope and scanning electron microscopy (SEM). The wear resistance of the paraffin oil was improved and the friction coefficient of the oil was decreased by addition of the IF-MoS 2 nanoparticles. The mechanism of friction and wear of the IF-MoS 2 nanoparticles was discussed.

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