超快激光诱导沟槽表面周期性结构增强毛细扩散性能的研究  

Ultrafast Laser-Induced Groove Surface Periodic Structure for Enhanced Capillary Diffusion Properties

作　　者：郑英明 曹佐 黄加炜 廖海青 黄亚军 龙江游 谢小柱[1,2,3] Zheng Yingming;Cao Zuo;Huang Jiawei;Liao Haiqing;Huang Yajun;Long Jiangyou;Xie Xiaozhu(Laser Micro/Nano Processing Lab,School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment,School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Department of Experiment Teaching,Guangdong University of Technology,Guangzhou 510006,Guangdong,China)

机构地区：[1]广东工业大学机电工程学院激光微纳加工研究中心,广东广州510006 [2]广东工业大学机电工程学院省部共建精密电子制造技术与装备国家重点实验室,广东广州510006 [3]广东工业大学实验教学部,广东广州510006

出　　处：《中国激光》2024年第20期269-275,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(52075103);广东省基础与应用基础研究基金区域联合基金重点项目(2020B1515120058);广东省自然科学基金青年提升项目(2023A1515030202)。

摘　　要：针对小尺度沟槽的毛细扩散性能不足问题,利用皮秒激光诱导小尺度沟槽表面周期性结构,通过毛细扩散实验研究了激光诱导沟槽表面不同角度周期性结构对液体流动的影响。结果表明,激光诱导周期性表面结构(LIPSS)改变了沟槽粗糙度,使毛细扩散性能获得提升,并且沟槽中更小的激光诱导周期性表面结构复合角度具有更小的液体流动阻力,从而具备更为优异的毛细扩散性能。在宽50μm、深25μm的沟槽中,具有0°LIPSS的沟槽的毛细扩散性能较光滑沟槽提升了30.8%。Objective Liquid-transporting functional surface structures play important roles in lithium-ion batteries,heat transfer,and chemical reactions.Grooves are excellent structures for liquid transport and their hydrophilic properties can be improved by generating CuO nanosheets and nanograss structures on their surfaces.However,as the functional surface structure becomes more precise,the mechanism by which the micro-and nanotextures of the surface affect its hydrophilic properties changes.Studies have revealed that micrometer-thick structures such as nanosheets and nanograss within small-scale grooves hinder liquid transport,resulting in a deterioration in liquid transport functions.In addition,the enhancement of the liquid transport performance by reducing the liquid flow resistance has been widely studied.Current efforts to reduce the flow resistance have primarily focused on superhydrophobic surfaces,which are not suitable for hydrophilic application scenarios.Laser-induced periodic surface structures(LIPSSs)are nanoscale structures that form highly periodic,ordered,and directionally controllable patterns,which can enhance the small-scale groove capillary force and drag reduction performance.In this work,the preparation of continuous clear periodic surface structures on a groove surface is realized by studying the effect of different laser parameters on the formation of LIPSSs.Capillary diffusion experiments are carried out on the laser-induced periodic structures on the groove surface.By analyzing the effect of the different composite angles of the LIPSS in the grooves on the capillary diffusion performance,we aim to identify the structures that enhance the liquid transport performance in small-scale grooves and to understand the relationship between LIPSSs and liquid flows.Methods Initially,the formation of copper fragments is suppressed by modulating an ultrafast laser,enabling the creation of smooth V-shaped grooves on the surface of a copper sheet by removing oxides through acid washing after laser ablation.S

关 键 词：激光技术 毛细扩散 皮秒激光 激光诱导周期性表面结构 

分 类 号：O647.5[理学—物理化学]