冲击载荷下蛋白质水溶液吸附成膜的润滑试验研究

Experimental Study on Adsorption Film Thickness of Protein Aqueous Lubricants under Impact Load

利用球盘接触形式的光干涉膜厚测量试验机,研究了周期冲击载荷作用下蛋白质水溶液在材料表面的吸附膜生长特性.对比了溶液蛋白质组分、亲疏水对偶表面和冲击条件对球盘接触区蛋白质吸附膜厚的影响.结果显示动态冲击下蛋白质的吸附膜厚要远高于静态吸附,吸附膜不断在接触区生长,之后趋于稳定.金属钢球比陶瓷球、疏水盘表面比亲水盘面,均更有利于蛋白质吸附膜的生长.同时发现吸附膜厚与单一蛋白质的浓度关系不大,却和蛋白质种类关系很大,球蛋白比白蛋白具有更好的吸附成膜性能.

The growth characteristics of the adsorbed protein film in a ball-on-disk contact were studied under cyclic impact load in protein aqueous solutions by interferometry. The effects of protein composition, hydrophobic interaction and impact conditions on the adsorption film thickness were investigated. It is found that the thickness of adsorption film of protein under dynamic impact was much higher than that by static adsorption, and the adsorption film grew in the contact area and a constant thickness was reached at last. The steel ball and hydrophobic disk surface were more conducive to the growth of protein adsorption film than the ceramic ball and the hydrophilic disc surface. At the same time, it is found that the adsorption film thickness was independent of the protein concentration, but it had a marked relation with the type of the proteins. The globulin showed stronger adsorption performance than the albumin.