| 贺承祖,赵波,唐致霞.化学通报,2021,84(4):394-399. |
| 椭圆法测量接触角 |
| Measurement of the Contact Angle by Ellipse Method |
| 投稿时间：2020-09-03 修订日期：2020-11-02 |
| DOI： |
| 中文关键词: 接触角 固滴法 半角法 椭圆法 |
| 英文关键词:Contact angle Sessile drop method Half-angle method Ellipse method |
| 基金项目:上海合作组织科技伙伴计划及国际科技合作计划基金项目（2019E01002）资助 |
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| 中文摘要: |
| 接触角在胶体与表面化学、矿物浮选、洗涤和油气开采等领域是一项重要的物性参数。本文提出椭圆法计算接触角的公式，在接触角小于90°时，利用测量出的椭圆的长轴和短轴半径和油-水-固接触点的坐标计算接触角；在接触角大于90°时，只需在椭圆轮廓线上选择两点，测量四个数据计算接触角，该方法计算公式比较简单，便于推广应用。本文提出将油滴剖面图用Power Point（简称PPT）软件转化为PPT图，有助于减少人为因素对固滴法中作切线的影响，可作为判断各种固滴法计算接触角方法准确性之依据。接触角大于90°时，也可根据PPT图的椭圆的长轴和短轴半径来计算接触角。对11种油-水-固体系的研究结果表明，本文提出的方法与切线法计算结果一致；半角法在界面张力较低、重力影响较大时计算出的接触角可比切线法测量出的接触角高50°～60°，不宜应用。 |
| 英文摘要: |
| The contact angle is a key physical parameter in the areas of colloid and surface chemistry, mineral flotation, washing, and oil and gas exploitation. In this study, an easy-to-use contact angle measurement method has been proposed. When the contact angle is less than 90°, the radius of the major axis and the minor axis of the ellipse and the coordinates of the oil-water-solid contact point are calculated; when the contact angle is greater than 90°, merely needs to select two points on the ellipse contour line and measure four data. The oil drop profile is converted into a PowerPoint (PPT) diagram with the MS Office PowerPoint software and the tangents calculated by the ellipse method are displayed on the diagram, which is conducive to reducing the influence of human factor on drawing tangents under the sessile drop method. When the contact angle is greater than 90°, the contact angle can be calculated according to the radius of the major axis and the minor axis of the ellipse on the PPT diagram. The research results of 11 kinds of oil-water-solid systems showed that the calculation method presented in this paper is consistent with the tangent method, the contact angle calculated by half angle method is 50°～60° larger than that measured by tangent method, so it is not suitable for application. |
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