微纳孔多孔材料吸附性能及其润滑油吸附智能润滑应用探讨

In engineering, the loading conditions of frictional pairs for different applications are complicate, which makes friction systems impossible to reach their best lubrication effect only with a constant content of lubricants. Even though there already exist intelligent lubrication controlled by electrical systems. There are limitations such as complicate controlling electrical system, application conditions required and addition energy consumed. Therefore, it is necessary to develop “material basis intelligent lubrication systems” which could adjust the content of lubricants automatically by material’s natural absorption property with loading conditions changing. Hereby, a flexible metal organic frameworks material Co(bdp) with excellent absorption due to its intrinsical porous property. Besides, the pores can absorb and release molecules by ‘gate-opening’ and ‘gate-closing’ induced by molecular pressure changing. For low pressure, the pores of Co(bdp) are “closed”. With the pressure increase, molecules diffuse into pores, where the pores will extend influenced by the inside molecules until the pores reach to “open“ state. With the pressure further increase, the molecules will release from Co(bdp) caused by the pressure compressing. Hence, the absorption and release properties of Co(bdp) are self-adjusted by pressure stimuli. Based on the self-adjusting property of Co(bdp) upon, this project aims to achieve intelligent lubrication for a lubricant system by self-adjusting the content of lubricants with pressure. The lubricants absorbed and released by Co(bdp) under different pressure will be studied. This research is detailed in below two parts: 1. The absorption-release property study of Co(bdp); 2. The study of absorption-release property on PAO lubricants for Co(bdp) under different pressures. This project is potential helpful for the Co(bdp) application study of lubrication.

在实际应用中，摩擦副在不同工况下承受的载荷环境非常复杂，而定量润滑油在复杂载荷环境下难以取得最优润滑效果，因此，开发不同载荷环境下润滑油含量自调控的智能润滑具有重要意义。柔性金属有机框架材料Co(bdp)，由于其自身的多孔性，具备优异的吸附性能；同时孔隙在不同分子压力作用下通过“打开孔隙”和“闭合孔隙”，可以对分子进行自主吸附和释放，因此，Co(bdp)具备压力可调的吸附、释放特性。基于此，本项目以实现压力载荷作用下润滑体系对润滑油含量的自调控智能润滑为目标，研究Co(bdp)在压力载荷作用下对润滑油的压力自调控吸附、释放规律。项目主要包括两方面研究：1、揭示Co(bdp)压力自调控吸附、释放特性机理；2、研究Co(bdp)不同油压下对PAO基础油的吸附、释放规律。该研究有望揭示Co(bdp)在压力作用下对润滑油的吸附性质，为该类金属有机框架材料在润滑油自调控智能润滑领域应用提供科学参考。

在实际应用中，摩擦副在不同工况下承受的载荷环境非常复杂，而定量润滑油在复杂载荷环境下难以取得最优润滑效果，因此，开发不同载荷环境下润滑油含量自调控的智能润滑具有重要意义。本项目以具有压力可调吸附、释放自适应特性的金属有机框架材料为研究对象，应用第一性原理和分子动力学模拟技术，揭示典型金属有机框架材料本征结构对润滑油分子吸附、释放规律影响及机理，确定润滑油分子与金属有机框架材料孔道尺寸效应对其吸附作用的影响，明确温度、载荷等对金属有机框架材料对润滑剂的和吸附、释放规律。该项目研究为金属有机框架材料在可控自润滑领域提供理论基础和科学依据。