飞秒激光制备不锈钢微纳结构表面的润湿机制研究  

Wetting Mechanism of Stainless Steel Micro-Nano Structure Surface Prepared by Femtosecond Laser

作　　者：张明池 刘子源 潘宁 陶海岩[1] 林景全[1] Zhang Mingchi;Liu Ziyuan;Pan Ning;Tao Haiyan;Lin Jingquan(School of Science,Changchun University of Science and Technology,Changchun,Jilin 130022,China)

机构地区：[1]长春理工大学理学院,吉林长春130022

出　　处：《中国激光》2021年第18期1-10,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金面上项目(51976015);科技部国家重点研发计划项目(2018YFB107402);吉林省科技厅自然科学基金项目(20200201250JC)。

摘　　要：具有润湿功能的微纳结构表面因在生物工程、防覆冰等领域的潜在应用价值,近年来吸引了大量的关注,但亲水微纳结构表面的润湿不稳定性成为了其应用中的一大阻碍。本文通过飞秒激光直写的方式在不锈钢表面制备了具有亲水性质的微纳结构表面并研究其经一定时间跨度后润湿性变化规律及机制。研究表明,在表面化学成分方面,不锈钢微纳结构表面通过浸泡氢氧化钠溶液处理后可有效抑制其润湿变化。通过X射线光电子能谱分析表明,这是由于处理前后润湿机制发生转变导致的。从微纳形貌方面,当不锈钢表面粗糙度增加时,可以通过保持长效毛细效应实现较长时间范围内的稳定超亲水状态。本文的研究结果为润湿性微纳结构表面的应用提供了一定的性能改善策略新思路,特别在亲水特性微纳结构表面的应用上具有重要的研究意义。Objective:The wettable functional surface in nature continues to be a great impetus to application of functional surfaces,which attracted widespread attention.Inspired by the porous surface of plants such as moss,many studies on the surface of superhydrophilic micro-nano structure have been carried out,which demonstrate that it has the ability to anti-fog and heat transfer enhancement.To further confirm that the surface wettability is unstable which will change with storage time in dark.Therefore,maintaining the stability of surface wetting has been challenging for the surface application of hydrophilic micro-nano structures.The current studies of wettability transition mechanism are built on different material surfaces and different storage environments,no systematic study concerning the influence of different wetting transition mechanisms on a single material has been published yet.In addition,there are relatively few studies devoted to surface wettability and surface morphology are also closely related,and for the same conversion mechanism,the effect of different surface morphologies on the overall macroscopic wettability.Therefore,it is necessary to comprehensively study the transformation and suppression of surface wettability from the aspects of surface morphology and surface energy,which is of great importance for maintaining the stability of the wettability of hydrophilic surfaces,and find application where the functional surfaces with hydrophilic properties is desired.Method:The employed laser was an amplified Ti:sapphire femtosecond laser system that generates light pulse at central wave-length of 800 nm,with pulse energy of 4 mJ and pulse duration of 50 fs at a 1 kHz repetition rate.Laser with different laser energy densities(adjusted via energy attenuator)were used to manufacture two kinds of sub-micron and columnar structure surfaces on the surfaces(304 stainless steel)via laser direct writing,denoted as SL and SH,respectively.The samples without chemical treatment were marked as SL-Air and SH-Air,re

关 键 词：光学设计 微观结构制造 飞秒激光 润湿性 微纳结构 润湿转变 

分 类 号：TN249[电子电信—物理电子学]