Nowadays, the awareness for the importance of green lubricants and green lubricating additives is increasing. In this work, [Choline][Proline] ([Cho][Pro]) was added into glycerol aqueous solution to receive a high-performance green lubricant. The effect of environment condition, e.g., CO₂ and water, on the green lubricant was studied. It is found that the properties of the green lubricant could be modulated by CO₂ and water content. As CO₂ was absorbed by the liquid, the viscosity of the liquid increased, while the viscosity of liquid diminished after adding more water. The presence of CO₂ led to an obvious increase of friction. At the same time, it is also found that the friction could be altered by water content. Thus, it is possible to control friction by changing CO₂ and water content.

如今，对绿色润滑剂和绿色润滑添加剂的重要性的认识正在提高。在这项工作中，[胆碱] [脯氨酸]（[ChoPro]）被添加到甘油水溶液中，以接收高性能的绿色润滑剂。研究了CO ₂和水等环境条件对绿色润滑剂的影响。发现绿色润滑剂的性质可以由CO ₂和水含量调节。随着CO ₂被液体吸收，液体的粘度增加，而液体的粘度在添加更多的水后降低。CO ₂的存在导致摩擦明显增加。同时，还发现摩擦可以被含水量改变。因此，可以通过改变CO ₂和水含量来控制摩擦。