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Two-dimensional (2D) nanocomposites as lubricant additives have been widely studied, but the synthetic process of the nanocomposites is not always environmentally friendly or economical. In this study, a new 2D nanocomposite, Fe 3 O 4 /h-BN, has been prepared by physical mixing of exfoliated h-BN nanosheets and organically modified Fe 3 O 4 nanoparticles. The nanocomposite displays a unique 2Dlayered structure without folds or wrinkles. The Fe 3 O 4 nanoparticles are uniformly dispersed on the h-BN nanosheet surfaces with the help of an elegant self-assembly strategy from van der Waals interactions. For the first time, Fe 3 O 4 /h-BN is studied as a lubricant additive and it exhibits excellent tribological properties. The coefficient of friction (COF) and the wear depth can be respectively reduced by 47% and 80% compared with the base oil. Based on the advantages of a simple and low-cost synthetic process and significant tribological properties, Fe 3 O 4 /h-BN offers great potential for lubrication application.

In this study, the tribological behaviors of graphene as a lubricant additive for steel/copper and steel/steel friction pairs were compared. For the steel/copper friction pair, the graphene sheets remarkably decreased the coefficient of friction and wear scar depth under low loads, but these slightly increased under high loads. The steel/steel friction pair showed excellent tribological properties even under high loads. Severe plastic deformation on the copper surface reduced the stability of the graphene tribofilm because of a rough copper transfer film on the steel during the running-in period. The results provide a better understanding of the mechanism of graphene as a lubricant additive.

Superwetting materials show great promise in emulsion separation. Herein, we developed superhydrophilic collagen fibers (CFs) by surface decoration of CFs with Zr4+, which were effective for dual separation of oil-in-water...

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