仿生超疏水多级结构表面设计及机理研究  

Design and Mechanism Study of Biomimetic Superhydrophobic Hierarchical Structure Surface

作　　者：李欣茹 赵张驰 薛洋 吴宏荣 刘禹 王春雷 魏宁 LI Xinru;ZHAO Zhangchi;XUE Yang;WU Hongrong;LIU Yu;WANG Chunlei;WEI Ning(School of Mechanical Engineering,Jiangnan University,Jiangsu Wuxi 214122,China;Hefei Hualing Co.,Ltd.,Hefei 230031,China;School of Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]合肥华凌股份有限公司,合肥230031 [3]上海大学理学院,上海200444

出　　处：《表面技术》2024年第22期171-179,共9页Surface Technology

基　　金：国家自然科学基金(12372327);国家自然科学基金青年基金(12002133)。

摘　　要：目的实现液滴在仿生超疏水表面的水黏附力调控。方法通过调控表面结构实现薄膜由仿玫瑰花瓣高黏附疏水表面转变为仿荷叶低黏附超疏水表面。将PS微球与无水乙醇混合制得涂层结构,将其转移到半固化的PDMS表面蒸发固化,通过调控PS微球的尺寸和混合比例,得到具有水黏附力可控的超疏水表面。利用场发射扫描电子显微镜、白光干涉仪和接触角测量仪,对薄膜表面的微观形貌、粗糙度和润湿性能进行表征。最后利用两种不同功能的表面制备了简易的液滴无损转移装置。结果通过制备直径为80 nm、8μm以及80 nm-8μm混合PS微球表面,发现80 nm和8μm表面的液滴接触角分别为129.3°和131.4°左右,但两种表面均呈现出液滴高黏附现象,即使表面翻转180°液滴也不会滚落。但80 nm-8μm混合表面呈现出低黏附超疏水现象,接触角可达158.3°,滚动角为8.9°。此外当两种粒子按体积比为1:1混合时,超疏水性最好。结论制备出的具有不同液滴黏附性的仿生超疏水表面,可实现微量液滴的无损转移,在自清洁、减阻、微流体和生化分析等领域具有应用潜力。It is a simple biomimetic technology that achieves surface wettability conversion by regulating the surface micro-nano structure,which can realize the conversion of the surface from high adhesion to low adhesion.The differences in surface microstructure primarily determine the two different wetting properties exhibited by rose petals and lotus leaves.This article studies the use of PS microspheres to construct bionic micro-nano structures on PDMS surfaces to achieve water adhesion regulation of superhydrophobic surfaces.The silicone prepolymer was prepared by evenly mixing the PDMS precursor and curing agent at a mass ratio of 10∶1.The mixture was then placed in a vacuum drying box and vacuumed for 20 min to remove air bubbles before being injected into a syringe for later use.The silicone prepolymer was then placed in the center of a glass slide(1 mL)and subject to uniform gelation(110 Hz/s,20 s)in a benchtop gelatinizer.Before curing at 100℃on a heating table for 2 min to achieve a semi-cured state,air bubbles were removed by vacuuming.Meanwhile,PS microspheres were mixed with alcohol at a volume ratio of 1∶1 in a reagent bottle to prepare 80 nm and 8μm single-component samples as well as 80 nm and 8μm equal-ratio mixed samples.The PS microspheres were uniformly dispersed in alcohol with an ultrasonic disperser for 15 min.Subsequently,the dispersed PS microspheres were partially embedded in the semi-cured silicone surface with a pipette.The sample was then placed on a heating table at 100℃for 10 min to evaporate and cure,resulting in a bionic PDMS surface sample with a microsphere structure.The microstructural morphology,surface roughness,and wetting properties were characterized with a field emission scanning electron microscope(Hitachi Su8100),a white light interferometer(MFP-D),and a contact angle meter(DSA25).By preparing the surfaces of 80 nm,8μm,and 80 nm-8μm hybrid PS microspheres,it was found that the contact angles of droplets on the 80 nm and 8μm surfaces were about 129.3°and 131.4°,res

关 键 词：超疏水表面 玫瑰花瓣效应 荷叶效应 聚苯乙烯微球 多级结构 界面黏附 

分 类 号：TB17[生物学—生物工程] TB34