冲击载荷作用下蛋白质水溶液润滑吸附膜的生长特性

目的 研究蛋白质水溶液挤压润滑条件下材料表面蛋白质吸附膜的动态生长特性及其影响因素。方法 利用光干涉技术测量球盘点接触在循环冲击条件下BSA蛋白质水溶液的吸附膜厚的生长过程，并研究冲击载荷、冲击次数、材料表面性质对BSA水溶液的吸附成膜特性的影响。结果 动态条件下蛋白质润滑吸附膜要比静态工况下的升高很多，冲击条件下蛋白质吸附膜不断生长，并最终达到稳定厚度。小载荷和疏水材料表面有利于蛋白质润滑吸附膜的生长。钢表面极易形成较厚吸附膜，而陶瓷表面吸附膜厚较低。结论 针对冲击载荷作用下蛋白质水溶液润滑吸附膜的生长特性研究对人工关节磨损、松动等的治疗、预防具有一定的临床指导意义。
Objective To study the dynamic growth of adsorption films on solid surfaces in point contacts with aqueous protein aqueous solutions and investigate the dominating factors. Methods The formation of the adsorption films within a ball-on-disc contact was measured using optical interference technique. The effects of impact loads, impact times and surface properties of the materials on the adsorption of BSA aqueous solution were also studied. Results Under dynamic conditions, the thickness of the adsorption film was much higher than that under static condition. The adsorption film was growing with increasing impact times and finally the stable thickness could be achieved. Small loads and hydrophobic materials were favorable for the growth of the adsorption film. The BSA adsorption film was easy to grow on the steel surface, but on the ceramic surface the adsorption film thickness was low. Conclusions The research about adsorbed lubricating films evolution of protein aqueous solution under impact loads is of clinical significance for treating and preventing of artificial prosthesis.