The optimum tribological properties of mixures of nanoparticles of CaCO3 and Cu in lubricating oils may be related with existing states of nanoparticles on surfaces.

• 研究还表明，润滑油中纳米碳酸钙、纳米铜粒子混合物添加剂的优良摩擦学性能与纳米粒子在表面存在形态相关。