双电层间相互作用力的AFM实验研究  

Experimental Investigationin the Acting Forces between Double-electric Layers

作　　者：陈英俊[1,2,3] 左启阳 黄平[2] 

机构地区：[1]广东石油化工学院机电工程学院,广东茂名525000 [2]华南理工大学机械与汽车工程学院,广东广州510640 [3]清华大学摩擦学国家重点实验室,北京100084 [4]深圳市金洲精工科技股份有限公司,广东深圳518116

出　　处：《润滑与密封》2013年第6期57-63,共7页Lubrication Engineering

基　　金：清华大学摩擦学国家重点实验室开放基金资助项目(SKLTF12B14);广东高校石油化工过程装备故障诊断与信息化控制工程技术开发中心资助项目(512033);广东石油化工学院重点学科资助项目(512057)

摘　　要：对2个双电层间的作用力进行理论分析,并利用CSPM5500型原子力显微镜考察不同电解质浓度,具有对称双电层结构或非对称双电层结构的探针和样品的相互作用力情况。理论分析表明,电解质溶液的浓度对双电层间作用力有明显的影响。实验结果表明,对称双电层间的相互作用力必然是斥力,电解质浓度低时的力-距离关系符合Stern理论模型,电解质浓度高的力-距离关系符合Helmholtz理论模型;非对称双电层间的相互作用力可以是排斥的,也可以是吸引的,这主要取决于电解质浓度和pH值。The force between the two double-electric layers of a lubrication system was discussed theoretically, and the mutual acting force between probes and samples with symmetrical double-electric layers or symmetrical double-electric lay- ers was studied by the CSPM5500 atomic force microscopy under different electrolyte concentrations. Theoretical analysis shows that the electrolyte concentration has significant influence on the acting force between double layers. The experimen- tal results show that there must be a force of repulsion between symmetrical double-electric layers, and the relationship between force and distance under low and high electrolyte concentration conform to the theoretical model of Stern and Helmhohz respectively. The acting force between non-symmetrical double-electric layers may be attractive or expulsive, which depends on the electrolyte concentration and the pH value.

关 键 词：双电层 作用力 固液界面 电解质 

分 类 号：TH789[机械工程—仪器科学与技术]