亚微观粗糙表面润湿各向异性及振动能影响研究  

Wetting Anisotropicity of Microscopic Rough Surfaces and the Effect of Vibrational Energy

作　　者：韩海强[1] 方国平[2] 张宏筠[3] 彭金璋[1] 李文[1,3] 乔冠军[2] 

机构地区：[1]吉首大学物理科学与信息工程学院,湖南吉首416000 [2]西安交通大学材料科学与工程学院,陕西西安710049 [3]湘潭大学材料与光电物理学院低维材料及其应用技术教育部重点实验室,湖南湘潭411105

出　　处：《湘潭大学自然科学学报》2009年第2期29-37,共9页Natural Science Journal of Xiangtan University

基　　金：湖南省教育厅科研资助项目(06C834)

摘　　要：利用表面微观粗糙结构获得超疏水及自清洁表面已引起了学术界及工业界研究者的广泛兴趣.当微观粗糙结构在表面平均而无各向性分布时,液滴沿三相接触线接触角分布将表现一致,如阵列柱状结构排布;当微观粗糙结构的分布有方向依赖性时,表面的疏水或亲水性质将呈现各向异性,如周期性平行沟槽结构.这种润湿各向异性性质对设计符合使用要求的超疏水表面有很重要的作用.本文在对平行沟槽表面润湿各向异性机制研究的基础上,以热力学分析方法来进一步讨论外界振动能大小对液滴润湿行为的影响.通过一些理论简化后,提出一种在实验研究与实际应用中都具有普遍意义的平行沟槽模型,经热力学分析计算后发现随着外界振动能的增加,在平行沟槽各方向上的非复合及复合润湿态的接触角滞后都将减小.进一步分析表明,非复合动态润湿的各向异性随外界振动能增加而减小,而复合动态润湿的各向异性则增加.Superhydrophobie or self-cleaning surfaces achieved by the microtextured geometry have attracted much attention in both academic and industrial fields. The wetting characteristics of the droplet will appear nearly uniform along the three-phase line when the roughness geometry is of isotropic distribution, e. g. , the arrayed pillar structure. However, when the arrangement of the roughness depends strongly on the direction, the wetting characteristics will be accordingly changed to be anisotropie, e.g. , the parallel grooves. Accord- ingly, a through theoretical understanding on the effects of surface geometry is very useful for the design of su- perhydrophobic surfaces. In this study, a thermodynamic methodology is proposed to theoretically investigate anisotropic wetting behavior of superhydrophobic grooved surfaces. In particular, the effect of vibrational ener- gy on anisotropic wetting has been discussed. Based on the thermodynamic analysis of the parallel grooves, it is found that when the vibrational energy increases, the contact angle hysteresis （CAH） on various directions will decrease obviously for both composite and noncomposite states. Furthermore, it is also found that the ani- sotropic wetting will be weakened for the noncomposite state but will be dramatically enhanced for the compos- ite state when the vibrational energy increases.

关 键 词：超疏水 各向异性 振动能 

分 类 号：TQ639[化学工程—精细化工]