不同润湿性液体在粗糙表面的润湿滞后现象  

Contact Angle Hysteresis with Different Wetting-liquids on Rough Surfaces

作　　者：肖易航 郑军[1] 何勇明[1] 刘鸿博[2] 龚丁 XIAO Yihang;ZHENG Jun;HE Yongming;LIU Hongbo;GONG Ding(College of Energy,Chengdu University of Technology,Chengdu 610059,China;Sichuan Water Conservancy Vocational College,Chengdu 611830,China)

机构地区：[1]成都理工大学能源学院,成都610059 [2]四川水利职业技术学院,成都611830

出　　处：《中国表面工程》2019年第6期150-156,共7页China Surface Engineering

基　　金：国家自然科学基金(5177403)。

摘　　要：润湿滞后是表征液体脱离固体表面难易程度的核心参数。为了研究不同润湿性状态下的润湿滞后现象,在定量描述固体表面粗糙度的基础上,首次在3种不同粗糙度固体表面上对强亲水到疏水范围内的液体进行系统的Wenzel接触角及润湿滞后实验,在通过Wenzel理论及静摩擦力理论验证座滴法与体积法实验结果准确性的前提下,进一步研究不同润湿性状态下杨氏接触角、粗糙度与润湿滞后之间的定性关系。结果表明:固体样品1(固体表面粗糙度,r=1.15)的润湿滞后效应在不同润湿状态下保持一常数,而固体样品2(r=1.64)及固体样品3(r=2.29)的润湿滞后效应在θ_e=90°附近达到最大,随着亲水和疏水程度的增加,润湿滞后效应均不断减小;粗糙度与润湿滞后的关系也并不单调,在亲水状态下,润湿滞后效应随着粗糙度的增加而减小,而在中性润湿状态下未发现明显规律。Contact angle hysteresis is a key parameter to determine the ease with which liquid breaks away from the solid surface.To study the contact angle hysteresis of different wettabilities,systematical experiments of Wenzel contact angle and contact angle hysteresis were conducted to characterize the wettabilities of strongly hydrophilic to hydrophobic liquids on three solid surfaces with quantitative surface roughness for the first time.Results obtained from the sessile drop and volume method tests were verified by the theories of Wenzel and static friction force,and used to reveal the relationship among Young contact angle,surface roughness and contact angle hysteresis.Results show that the contact angle hysteresis keeps constant in case of varied wettabilities of liquids on the surface of sample 1(solid surface roughness,r=1.15).However,the contact angle hysteresis is maximum atθe=90°on the surface of sample 2(r=1.64)and sample 3(r=2.29),and decreases with increasing hydrophilicity and hydrophobicity of liquids.Besides,the effect of solid surface roughness on contact angle hysteresis depends on the wettability.The contact angle hysteresis decreases with increasing solid surface roughness when the wettability is hydrophilicity,while it presents no-obvious regularity in case of medium wettability.

关 键 词：润湿性 润湿滞后 座滴法 体积法 固体表面粗糙度 

分 类 号：O647.5[理学—物理化学]