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.

中文翻译：

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NaOH/KOH混合溶液中水热剥离超薄六方氮化硼纳米片（BNNSs）的制备及其摩擦学性能

摘要 通过在混合 NaOH/KOH 溶液中进行水热处理和随后的超声处理相结合，成功地剥离了六方氮化硼纳米片 (BNNSs)。剥离后的 BNNS 的形貌和结构由一系列表征确定，例如 XRD、FTIR、拉曼、TEM、SEM、HRTEM 和 AFM。结果表明，NaOH/KOH 混合溶液中的水热处理在剥离过程中起重要作用，剥离后的 BNNSs 具有约 10 倍的超薄厚度。2-3 层。此外，研究了BNNS在基础油中的分散性和稳定性。作为一个有前景的应用，BNNS 作为基础油添加剂的摩擦学特性在球对球配置上进行了测试。BNNS 基础油的平均摩擦系数和平均磨痕直径 (0. 06%）分别下降了约 35.7% 和 35.2%。最后，提出了BNNS的形成过程和抗磨机理。