Graphene oxide (GO), a novel carbon‐based nanomaterial, has been significantly developed and investigated during the past decade in the fields of material science and chemistry. GO is essentially one‐atom thick, but the lateral dimension can reach to dozens of microns, resulting in a unique 2D layered structure. This allows for oxygen‐containing functional groups to be grafted on the sheets, which give GO a unique amphiphilicity and enables it to self‐assemble at two‐phase interfaces. This characteristic provides significant potential for the development of functional interfacial materials with promising performances, including the synthesis of large area interfacial membranes, GO‐based coating with self‐healing abilities, and functional GO‐based emulsions. In this review, the interfacial assembly behaviors of GO and functionalized‐GO at the air–liquid, liquid–liquid, and liquid–solid interfaces are discussed to further understand the properties and applications of GO. The synthesis of different composites using these interfacial properties is also discussed. The application progress of GO composite materials that are prepared based on their interfacial properties is also illustrated, and possible challenges are proposed.
Water is as an economic, eco-friendly, and efficient lubricant that has gained widespread attention for manufacturing. Using graphene oxide (GO)-based materials can improve the lubricant efficacy of water lubrication due to their outstanding mechanical properties, water dispersibility, and broad application scenarios. In this review, we offer a brief introduction about the background of water lubrication and GO. Subsequently, the synthesis, structure, and lubrication theory of GO are analyzed. Particular attention is focused on the relationship between pH, concentration, and lubrication efficacy when discussing the tribology behaviors of pristine GO. By compounding or reacting GO with various modifiers, amounts of GO-composites are synthesized and applied as lubricant additives or into frictional pairs for different usage scenarios. These various strategies of GO-composite generate interesting effects on the tribology behaviors. Several application cases of GO-based materials are described in water lubrication, including metal processing and bio-lubrication. The advantages and drawbacks of GO-composites are then discussed. The development of GO-based materials for water lubrication is described including some challenges.
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