荷叶效应的研究  

A study on lotus effect

作　　者：刘双平[1] 俞熹[1] 

机构地区：[1]复旦大学物理系,上海200433

出　　处：《大学物理》2011年第9期50-54,61,共6页College Physics

基　　金：国家基础科学人才培养基金(J0730310)资助

摘　　要：荷叶效应源于物体表面微米-纳米结构带来的超疏水性.本文通过较为简便的实验装置,研究了超疏水表面的水滴形态;在MATLAB环境下,利用图形工具箱(IPT)对数字图像进行处理;结合Runge-Kutta算法和Newton-Raphson迭代法,通过拟合Young-Laplace方程实现了对接触角较高精度的测量;并在此基础上,定性地研究了Wenzel态和Cassie态下水滴润湿性质的不同以及超疏水表面对于不同粒度的沙粒的自清洁能力,对认识荷叶效应这一自然界中的常见现象提供了简便而直观的方法.Lotus effect is based on the superhydrophobicity which results from the micro-nano structure of the surface.A simple experimental configuration is constructed to analyze the shape of a water drop on superhydro-phobic surface.The image processing toolbor（IPT） in MATLAB can be utilized in dealing with the corresponding digital image.By fitting Young-Laplace equation of the drop with the assistance of Runge-Kutta method and Newton-Raphson method,the contact angle of the water drop is obtained with relatively high precision.According to this result,the difference in wetting properties between Wenzel state and Cassie state is analyzed qualitatively,and the self-cleaning ability related to sand particles in different sizes is also presented,which provides an especially convenient and intuitive method for understanding lotus effect.

关 键 词：荷叶效应 超疏水 自清洁 接触角 Young-Laplace公式 数字图像处理 

分 类 号：O414.1[理学—理论物理]