Water deteriorates lubricating oils: removal of water in lubricating oils using a robust superhydrophobic membrane
Water deteriorates lubricating oils: removal of water in lubricating oils using a robust superhydrophobic membrane
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水会使润滑油变质：使用坚固的超疏水膜去除润滑油中的水
作者：
Siyang Zhao;Lu Tie;Zhiguang Guo;Jing Li
水被认为是润滑油中的污染物。近年来，具有特殊润湿性的界面材料被广泛开发用于油水分离。然而，解决因水导致的润滑油故障仍然是一个挑战。在这里，提出了一种坚固的超疏水膜来有效地去除润滑油中的水分，以恢复其润滑能力。与纯润滑油相比，使用超疏水膜收集的润滑油具有相当的摩擦系数和磨损体积，远低于被水污染的润滑油。润滑油中的水会加速金属基材的氧化和磨损腐蚀。此外，溶解在含水润滑油中的金属离子会导致润滑油的催化脱氢，导致大量碳基磨屑的沉积。重要的是，即使在严重的机械损伤后，所制备的膜在极大的拒水性、高效的润滑油净化和低磨损量方面仍表现出稳定的性能。坚固的界面材料在实际解决因水引起的润滑油失效方面具有潜在的优势。
Water is recognized as a contaminant in lubricating oils. Recently, interfacial materials with special wettability have been broadly developed for oil–water separation. However, solving lubricating oil failure caused by water remains a challenge. Here, a robust superhydrophobic membrane is presented to effectively remove water in lubricating oils to recover their lubricating capability. Compared to pure lubricating oils without or with an additive, lubricating oils collected from their emulsions using the superhydrophobic membrane have an equivalent friction coefficient and wear volume, which are much lower than that of lubricating oils contaminated by water. Water in lubricating oils accelerates the oxidation of metallic substrates and wear corrosion. Moreover, the metallic ions dissolved in water-containing lubricating oils induce the catalytic dehydrogenation of lubricating oils, leading to the deposition of a good deal of carbon-based wear debris. Importantly, the prepared membrane shows steady performance in regard to extreme water repellency, high-efficiency purification of lubricating oils, and low wear volume even after harsh mechanical damage. Robust interfacial materials have potential advantages in practically solving lubricating oil failure caused by water.