Modelling of spreading process: effect from hydrogen bonds  

作　　者：李欣 胡元中 姜澜 

机构地区：[1]Department of Mechanical and Automation Engineering, 3rd School Beijing Institute of Technology [2]The State Key Laboratory of Tribology, Tsinghua University

出　　处：《Chinese Physics B》2008年第8期3035-3039,共5页中国物理B（英文版）

基　　金：Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20060003025);the Science Foundation for Post Doctoral Research from the Ministry of Science and Technology of China (Grant No 20070420017);the 111 Project (Grant No B08043) and the National Natural Science Foundation of China (Grant No 50705009)

摘　　要：Lubricant spreading on solid substrates has drawn considerable attention not only for the microscopic wetting theory but also for the dramatic application in head-disk interface of magnetic storage drive systems. Molecular dynamic simulation based on a coarse-grained bead-spring model has been used to study such a spreading process. The spreading profiles indicate that the hydrogen bonds among lubricant molecules and the hydrogen bonds between lubricant molecules and polar atoms of solid substrates will complicate the spreading process in a tremendous degree. The hydrogen bonds among lubricant molecules will strengthen the lubricant combination intensity, which may hinder most molecules from flowing down to the substrates and diffusing along the substrates. And the hydrogen bonds between lubricant molecules and polar atoms of solid substrates will confine the lubricant molecules around polar atoms, which may hinder the molecules from diffusing along the substrates and cause precursor film to vanish.Lubricant spreading on solid substrates has drawn considerable attention not only for the microscopic wetting theory but also for the dramatic application in head-disk interface of magnetic storage drive systems. Molecular dynamic simulation based on a coarse-grained bead-spring model has been used to study such a spreading process. The spreading profiles indicate that the hydrogen bonds among lubricant molecules and the hydrogen bonds between lubricant molecules and polar atoms of solid substrates will complicate the spreading process in a tremendous degree. The hydrogen bonds among lubricant molecules will strengthen the lubricant combination intensity, which may hinder most molecules from flowing down to the substrates and diffusing along the substrates. And the hydrogen bonds between lubricant molecules and polar atoms of solid substrates will confine the lubricant molecules around polar atoms, which may hinder the molecules from diffusing along the substrates and cause precursor film to vanish.

关 键 词：PERFLUOROPOLYETHER molecular dynamic simulation thin film lubrication SPREADING 

分 类 号：O641.1[理学—物理化学]