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低速度、低黏度和摩擦副表面达到分子级光滑时所形成的纳米级润滑膜性能不同于弹流润滑和边界润滑. 由于尺寸效应, 结构长程有序的液晶添加剂对纳米级油膜的润滑特性和成膜机理有极大的影响. 采用相对光强原理, 研究了十六烷中加入胆甾醇酸酯液晶添加剂时纳米级油膜的性能变化. 实验结果表明, 在纳米级薄膜润滑区, 添加有液晶的十六烷的实测油膜厚度比理论计算值大3～5倍. 油膜厚度随液晶极性、液晶浓度和外加电场的增加而增加. 润滑剂的有效黏度与滚动速度和外电压有关, 随滚动速度的减小而由体相黏度逐渐增大到体相黏度的几至几十倍, 随外电压的增加而增加并逐步趋于稳定. 近固体表面润滑剂分子的有序度越高, 油膜越厚.
The performance of nano-scale lubricant film formed by low velocity, low viscosity and friction pair surface is different from that of EHL and boundary lubrication. Due to the size effect, the long- The mechanism of film formation has a great impact.Using the principle of relative intensity of light, the performance of nano-sized oil film was studied when adding cholesteric acid ester liquid crystal additive in cetane.Experimental results show that in the nano-scale film lubrication area, Of the measured film thickness of cetane than the theoretical calculated value 3 to 5 times the thickness of the film increases with the liquid crystal polarity, liquid crystal concentration and applied electric field increases.The effective viscosity of the lubricant with rolling speed and external voltage, with the rolling The velocity decreases gradually from the bulk viscosity to the bulk viscosity of several to several times, with the increase of external voltage and gradually stabilize. Near the surface of the solid lubricant molecules higher degree of order, the oil film The thicker.