Hairy nanoparticles, which graft organic chains on nanoparticles, have led to a wide variety of advanced materials and have been\napplied in many fields over the past two decades. In this paper, effects of nanoparticle size and organic chain on the tribological\nproperties of amino functionalized hairy silica nanoparticles (HSNs) were investigated. Silica nanoparticles with different sizes and\namino group organic chains were synthesized and dispersed into polyalphaolefin (PAO) via a modified process. The synthesized\nHSNs were characterized by variety of methods. The tribology properties of those HSNs were investigated using a four-ball\ntribometer. The coefficient of friction and wear scar diameter were measured and analyzed. It was found that the HSNs could\nforma stable homogeneous solution with PAO.The tribological performance of the PAO 100 was enhanced dramatically by adding\nthe HSNs. The data suggested that HSNs with larger size, longer organic chains, and more amino groups gave better antiwear and\nfriction reduction properties than other nanoparticles.
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