亲水性时静态接触角算法及在硅橡胶憎水性检测中的应用  

Static Contact Angle Algorithm of Hydrophilicity and Its Application in Silicone Rubber Hydrophobicity Detection

作　　者：徐志钮[1] 王国利 赵丽娟[3] 赵鹏[4] 王刚[3] 李丹丹[5] 

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [2]特高压工程技术(昆明广州)国家工程实验室,广州510080 [3]华北电力大学电子与通信工程系,保定071003 [4]华北电力大学环境科学与工程学院,保定071003 [5]华北电力大学机械工程系,保定071003

出　　处：《高电压技术》2012年第8期1891-1900,共10页High Voltage Engineering

基　　金：特高压工程技术(昆明;广州)国家工程实验室开放基金;中央高校基本科研业务费专项资金(11MG42);大学生创新性实验计划(20112126)~~

摘　　要：为了提高亲水性时静态接触角计算的准确性,提出了一种考虑水珠体积和憎水性的静态接触角算法。基于Young-Laplace方程产生水珠边缘曲线,同时在其上叠加一定的噪声来模拟水珠边缘提取时的误差,研究了接触角≤90°、水珠体积<200μL且接触线长度≤1cm时,水珠体积和接触角对圆拟合算法和椭圆拟合算法准确性的影响,同时分析了噪声含量对2种算法准确性的影响。研究结果表明:噪声对椭圆拟合算法准确性的影响大于圆拟合算法,随着接触角的增大,噪声的影响减弱;随着水珠体积的增加,圆拟合算法的误差明显增大,椭圆拟合算法的误差略有增加;接触角≤15°时应选择圆拟合算法;接触角>15°而≤70°且水珠体积≤7μL时应选择圆拟合算法,接触角>15°而≤70°且水珠体积>7μL时应选择椭圆拟合算法;接触角>70°且≤90°时应选择椭圆拟合算法。将2种算法应用于不同憎水性的硅橡胶试样静态接触角的测量,结果验证了分析结论。所提出的静态接触角算法可有效提高硅橡胶材料处于亲水性状态时静态接触角计算的准确性。To improve accuracy of calculating the static contact angle of hydrophilic materials,we proposed a static contact angle algorithm considering globule volume and hydrophobicity.The globule edge curve was generated by the Young-Laplace equation,in the meantime,noise was superimposed to the curve to simulate the error of edge extraction,thereby,we studied the influences of the globule volume and contact angle on circle fitting algorithm and ellipse fitting algorithm.When the contact angle is not more than 90°,the globule volume less than 200μL,and contact line shorter than 1cm,we studied the influence of noise content on accuracy of the two algorithms.The results indicate that,the influence of noise on the ellipse fitting algorithm is more remarkable than that on the circle fitting algorithm,and the larger contact angle,the smaller influence.The error of the circle fitting algorithm will increase obviously with the increase of the globule volume,and the ellipse fitting algorithm will increase slightly.If the contact angle is less than 15°,the circle fitting algorithm should be selected to calculate the contact angle.If the contact angle is larger than 15°and less than 70°,in the meantime,the globule volume is less than 7μL,the circle fitting algorithm should be selected.If the contact angle is larger than 15°and less than 70°,in the meantime,the globule volume is larger than 7μL,the ellipse fitting algorithm should be selected.If the contact angle is larger than 70°and less than 90°,the ellipse fitting algorithm should be selected.Finally,the proposed contact angle algorithm was used to calculate the static contact angle of silicone rubber samples with different hydrophobicities,and the conclusion was verified by the experiment.If the silicone rubber material is hydrophilic,the accuracy of the static contact angle measurement can be improved by using the proposed method.

关 键 词：硅橡胶 憎水性 亲水性 静态接触角 圆拟合 椭圆拟合 Young-Laplace方程 水珠体积 

分 类 号：TM206[一般工业技术—材料科学与工程]