摘要
为揭示超薄膜的特性与其微观结构的关系 ,运用分子动力学模拟的方法进行了研究。模拟系统采用云母晶面作为固体壁面 ,十六烷采用珠簧模型。模拟表明 ,超薄膜状态下流体出现了层状的类固态微观结构。采用固液比作为类固态与类液态的比例指标 ,发现等效粘度的上升是薄膜流体类固化造成的。模拟发现了摩擦力的非线性特性 。
Molecular dynamics simulation was employed in this paper to investigate the relation between the properties of ultra thin films and their microstructure. The solid surfaces were modeled as mica crystal and the bead spring model was used to represent the hexadecane molecules. The wall induced layering microstructure implies a solid like phase. The solid to liquid ratio was introduced to represent the solid like phase growing in the film. The results show that solidification of the ultra thin film microstructure may be the cause of the incresed viscosity. The nonlinear relation between friction force and shear velocity is indicated in simulation. The changes in the film microstructure are related to the nonlinear friction shear velocity relationship.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第5期70-72,共3页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金项目!(59875042
59735110)
关键词
超薄膜流体摩擦
固液比
微观机制
超薄膜润滑
ultra-thin film friction
molecular dynamics simulation
solid to liquid ratio
