氧化石墨烯的双亲性调控及其作为水基润滑材料的特性研究

The strategy on “Made in China 2025” will lead to the rapid development of manufacture industry, resulting in the new challenges for the development of lubricant, the blood of modern industry. In the meanwhile, the development of green water based lubricant is inevitable due to the problems on energy shortage and environment pollution. While due to the high water content, water based lubricant cannot form effective lubrication films on the tribological surfaces. In order to solve this problem, we would like to take advantage of graphene oxide (GO), which has both excellent lubrication properties and controllable amphiphilic characteristic. Based on tailoring the amphiphilicity, GO can be used as emulsifier to construct Pickering emulsions. We would like to study the lubrication characteristics of the GO Pickering and use this new type material as water based lubricant. A series of symmetric GO and Janus GO will be designed and synthesized based on the development of GO with different oxygen degree and different lateral size. The self-assembly behavior of GO at water-oil interface will be studied. The functionalized GO with good interface wettability will be screened out, and will be used to make Pickering emulsion. The relationship between GO molecular structure, interface wettability and Pickering emulsion stability will be established. The competitive adsorption behavior, lubrication film formation and lubrication performance of GO based Pickering emulsion will be studied to illuminate the lubrication mechanism. The research will provide new concept for improving the lubrication performance of water based lubricants.

“中国制造业2025”战略规划为制造业创造了快速发展的机遇，也给现代工业的“血液”--润滑剂带来了新的挑战。绿色水基润滑剂因能缓解能源紧缺和环境恶化问题而备受关注，但因其水含量大，在摩擦过程中很难形成有效的润滑膜。针对这一问题，申请人拟从润滑性良好且双亲性可控的氧化石墨烯（GO）出发，以功能化GO为乳化剂构建Pickering乳液，研究其作为水基润滑材料的润滑特性。研究将以不同氧化程度和横向尺寸的GO为基础，利用GO分子结构中的含氧官能团，设计制备含不同碳链及活性元素的对称GO和不对称Janus GO；研究功能化GO的油水界面行为，筛选出润湿性能良好的GO，构建Pickering乳液；揭示GO的结构、润湿性、Pickering乳液稳定性之间的关系规律；研究GO Pickering乳液在摩擦副表面的吸附行为、表面膜特性及润滑性能，阐明其作用机理，为提高水基润滑剂的润滑性能提供新的思路和方法。

“中国制造业2025”战略规划为制造业创造了快速发展的机遇，也给现代工业的“血液”--润滑剂带来了新的挑战。绿色水基润滑剂因能缓解能源紧缺和环境恶化问题而备受关注，但因其水含量大，在摩擦过程中很难形成有效的润滑膜。针对这一问题，本项目从润滑性良好且双亲性可控的氧化石墨烯（GO）出发，通过对GO的分子结构进行设计、以及对原料、配比、溶剂及温度等进行优化，制备了不同氧化程度的GO、基面功能化GO、边缘功能化GO、不对称功能化GO共四种类型的功能化GO；通过考察功能化GO在不同类型油水界面的组装及降低界面张力的能力，建立了功能化GO的分子结构与其界面行为之间的关系规律，获得了比传统表面活性剂更优的降低界面张力能力的功能化GO；通过考察功能化GO与助表面活性剂、流变改进剂等的复配特性，以及对制备工艺进行优化，阐明了功能化GO Pickering乳液的形成机制，获得了具有良好稳定性的GO Pickering乳液；通过研究功能化GO Pickering乳液在不同工况下的润滑行为，揭示了其水润滑特性，结合摩擦表面形貌及润滑膜的组成与分布分析，阐明了GO Pickering乳液的润滑作用机理，为提高水基润滑剂的润滑性能提供了新的思路和方法。