期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 5, 页码 3187-3195出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b00502
关键词
fluoride modification; hexagonal boron nitride; ball milling; nanoscrolls; rolling/incommensurate contact; low friction
资金
- Foundation of Lanzhou Institute of Chemical Physics, National Natural Science Foundation of China [51875550, 51527901, U1737213]
- Youth Innovation Promotion Association [2017459]
- Science and Technology Program of Gansu Province [18JR3RA380]
Herein, we demonstrate that hexagonal boron nitride nanosheets (h-BNNSs) can be used as water dispersible lubricant additive through simple fluoride modification. The fluorination of h-BNNSs (F-BNNSs) is carried out via a facile ball milling of commercial h-BN microflakes in ammonia fluoride solution. The as-obtained F-BNNSs exhibit excellent antifriction and antiwear performance as water dispersible lubricant additive with low concentration of less than 1.0 mg/mL, and their friction coefficients can be lower than 0.08, achieving low friction. This low friction originates because F-BNNSs at a sliding interface roll up to form nanoscrolls induced by the fluoride doping curling effect and subsequent shearing force. These resulting nanoscrolls can slide against the substrate, achieving a rolling/incommensurate contact, thus substantially reducing friction coefficients. The overall lubricant mechanism is further elucidated based on the first principles simulations. This finding indicates the potential of achieving low, even ultralow, friction of h-BNNSs as water dispersible lubricant additives through composition and structure designing.
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