Lubricant additives, based on inorganic nanoparticles coated with organic outer\nlayer, can reduce wear and increase load-carrying capacity of base oil remarkably, indicating\nthe great potential of hybrid nanoparticles as anti-wear and extreme-pressure additives with\nexcellent levels of performance. The organic part in the hybrid materials improves their\nflexibility and stability, while the inorganic part is responsible for hardness. The relationship\nbetween the design parameters of the organic coatings, such as molecular architecture\nand the lubrication performance, however, remains to be fully elucidated. A survey of\ncurrent understanding of hybrid nanoparticles as lubricant additives is presented in this review.
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