飞秒激光诱导梯度润湿性聚甲基丙烯酸甲酯表面  

Femtosecond Laser Induced Gradient Wettability of Polymethyl Methacrylate Surface

作　　者：杨奇彪[1] 季一平 蒋元林 黄颖 汪于涛 刘顿[1] Yang Qibiao;Ji Yiping;Jiang Yuanlin;Huang Ying;Wang Yutao;Liu Dun(College of Mechanical Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China;Shanghai Key Laboratory of Laser Beam Micro Processing,Shanghai lnstituto of Lasar Tochnology Co.,Ltd.,Shanghai 200233,China)

机构地区：[1]湖北工业大学机械工程学院,湖北武汉430068 [2]上海市激光技术研究所有限公司,上海市激光束精细加工重点实验室,上海200233

出　　处：《应用激光》2025年第2期90-97,共8页Applied Laser

基　　金：湖北省重点研发计划项目(2021BAA172);教师特色创新研究项目(2021XJZZ14)。

摘　　要：研究飞秒激光制备聚甲基丙烯酸甲酯(PMMA)梯度润湿性表面对微流控通道内液滴的操控具有重要意义。采用飞秒激光在PMMA表面加工平行微凹槽结构,通过改变激光能量密度参数来获得不同梯度的润湿性表面。运用接触角测量仪、激光共聚焦显微镜、能谱仪和扫描电镜分别测量PMMA表面的接触角、粗糙度、化学元素分析以及表面微观形貌,采用高速摄像机观察液滴在梯度润湿性表面的铺展趋势。结果表明:随着激光能量密度的增大,表面接触角呈先增大后减小的趋势,表面粗糙度参数根均方高度和算数平均高度均呈上升趋势,表面C元素含量减少且O元素含量增加。梯度润湿性表面的梯度差越大,液滴铺展速度越快。研究可为PMMA微流控通道的制备提供理论参考。The fabrication of polymethyl methacrylate(PMMA)gradient wetting surfaces using femtosecond lasers is significant for controlling droplets in microfluidic channels.In this paper,parallel microgroove structures are fabricated on PMMA surfaces using femtosecond laser.Gradient wetting surfaces with different properties are obtained by designing laser energy density parameters.Contact angle measurements,laser confocal microscopy,energy spectrum analysis,and scanning electron microscopy are used to measure the contact angle,roughness,chemical element composition,and surface morphology of PMMA surfaces,respectively.A high-speed camera is used to observe the spreading trend of droplets on gradient wetting surfaces.The results show that as the laser energy density increases,the surface contact angle first increases and then decreases.The surface roughness parameters,root-mean-square height and arithmetic mean height,both exhibit an upward trend.The content of carbon on the surface decreases while the content of oxygen increases.The larger the gradient difference of the gradient wetting surface,the faster the droplet spreading speed.This study on the reliable control of surface wettability by femtosecond laser provides a theoretical reference for the fabrication of PMMA microfluidic channels.

关 键 词：聚甲基丙烯酸甲酯 梯度润湿性 液滴铺展 飞秒激光 

分 类 号：TN249[电子电信—物理电子学]