硅表面微结构对表面润湿方向性影响的分子动力学研究  

Effects of surface microstructure on wetting direction of silicon substrates by molecular dynamics study

作　　者：王玉娟[1,2] 郭亚杰[1,2] 裘英华[1,2] 陈云飞[1,2] 

机构地区：[1]东南大学机械工程学院,南京211189 [2]东南大学江苏省微纳生物医疗器械设计与制造重点实验室,南京211189

出　　处：《东南大学学报（自然科学版）》2014年第6期1161-1165,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51345012)

摘　　要：采用分子动力学方法研究了硅表面微结构对表面润湿方向性的影响,采用3种不同的微结构探讨了水滴在表面上的扩散方向问题,以及微结构尺寸对表面润湿性的影响.研究结果表明,表面微结构宽度存在临界宽度值,当微结构宽度小于临界宽度时表面表现为疏水性,反之,亲水性增强;在疏水性表面上,水的铺展性表现为各向同性,水滴稳定后俯视图近似为圆形,在亲水性表面,水的铺展性表现为各向异性,表面微结构形状不同,水滴稳定后呈现不同的特殊形状.Molecular dynamics simulation is used to study the wetting effects of silicon surface mi-crostructure on the wetting direction of microstructure.The spreading direction of water droplets on surfaces of three different microstructures,together with the influence of the size of micro-structures on the surface,are discussed.The results show that there is a critical width value for different micro-structures.A hydrophobic surface is formed when the microstructure width is smaller than its critical size.Otherwise,a hydrophilic surface is formed.When a surface is hydrophobic,the spread of wa-ter droplet is isotropic,showing a sphere shape approximately in a top view after it is stable.When a surface is hydrophilic,the micro-droplet spreads anisotropically,leading to different special steady shapes due to the difference of microstructure shape.

关 键 词：分子动力学 表面润湿性 表面微结构 

分 类 号：TH117.2[机械工程—机械设计及理论]