Abstract The fluorinated graphene (FG) has been reported in diverse applications for its unique chemical and physical properties, resulting from the 2D carbon-skeleton and decorated C-F bonds. How to substitute the FG’s fluorine atom with other active functional groups and retain its fluorine content is still a challenge. In this work, a microwave-assisted liquid-phase synthetic route was introduced to obtain hydroxyl modified fluorinated graphene (HOFG) with high fluorine content. The as-prepared product exhibits excellent water dispersibility with far less fluorine loss than previously reported methods. It is found that the HOFG’s fluorine/oxygen (F/O) ratio plays a crucial role in the water dispersibility and lubricating property. The as-prepared HOFG exhibits excellent dispersibility at a high F/O ratio (35). Used as the water lubrication additive for ceramic-steel pair, the as-prepared HOFG significantly improves water’s load-bearing capacity from 250N to 600N. The friction-reduction and anti-wear ability of water are also improved with the addition of the HOFG samples. Compared with pure water, the aquous dispersion of HOFG-40M at a concentration of 1.5 mg/mL shows the best lubricating property with a nearly 20% reduction of friction coefficient and a 30% decrease of wear.

中文翻译：

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微波辅助合成具有高氟含量和高承载能力的羟基改性氟化石墨烯作为陶瓷/钢接触的水润滑添加剂

摘要 氟化石墨烯 (FG) 因其独特的化学和物理性质而在不同的应用中得到了报道，这是由二维碳骨架和装饰的 CF 键产生的。如何用其他活性官能团取代FG的氟原子并保持其氟含量仍然是一个挑战。在这项工作中，引入了微波辅助液相合成路线，以获得高氟含量的羟基改性氟化石墨烯（HOFG）。所制备的产品表现出优异的水分散性，与以前报道的方法相比，氟损失要少得多。研究发现，HOFG 的氟/氧 (F/O) 比对水分散性和润滑性能起着至关重要的作用。制备的 HOFG 在高 F/O 比 (35) 下表现出优异的分散性。作为陶瓷-钢副的水润滑添加剂，所制备的HOFG显着提高了水的承载能力，从250N提高到600N。随着HOFG样品的加入，水的减摩和抗磨能力也得到了提高。与纯水相比，浓度为1.5 mg/mL的HOFG-40M水分散体表现出最佳的润滑性能，摩擦系数降低近20%，磨损降低30%。