Abstract
The hexagonal boron nitride nanosheets (BNNSs) were successfully exfoliated by combining hydrothermal treatment in mixed NaOH/KOH solution and subsequent sonication process. The morphology and structure of the as-exfoliated BNNS were determined by a series of characterizations, such as XRD, FTIR, Raman, TEM, SEM, HRTEM and AFM. The results demonstrated that the hydrothermal treatment in mixed NaOH/KOH solution served as an important role in exfoliation and the as-exfoliated BNNSs had the ultrathin thickness of ca. 2–3 layers. Additionally, the dispersion and stability of BNNS in base oil was studied. As a promising application, the tribological properties of BNNS as additive in base oil were tested on ball-on-ball configuration. The average friction coefficient and average wear scar diameter of the BNNS-base oil (0.06%) dropped by about 35.7% and 35.2%. Finally, the forming process and anti-wear mechanisms of BNNS were proposed.
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