顶部视图方法作为接触角度测量的强大的替代方法
Emmanuel Agyei1, Bimin Zhang Newby1
1Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States.
Langmuir : the ACS journal of surfaces and colloids
|March 4, 2026
概括
使用球形帽假设的顶部视图接触角度测量方法是侧面视图技术的可行替代方案,特别是在具有挑战性的表面上. 这项研究证实了它对小滴的准确性,为评估重力效应提供了一个新的指标.
科学领域:
- 表面科学与工程 表面科学与工程
- 材料的特性 材料的特性
- 流体动力学 流体动力学
背景情况:
- 传统的侧视接触角度测量在粗,可变形或不规则的表面上存在局限性.
- 这些局限性包括基本可见性受损,午线清晰度和滴对称性,阻碍了准确的分析.
- 在具有挑战性的场景中,需要使用替代方法来可靠地确定接触角.
研究的目的:
- 为了验证顶部视图方法用于接触角度测量,依赖于球形帽假设.
- 评估其作为传统侧视技术的替代方案的实用性,特别是对于困难的表面.
- 引入和评估一个下降投影指数 (DPI) 用于量化重力效应在顶部视图成像.
主要方法:
- 同时获取顶部和侧面视图图像的静止滴.
- 使用滴量测量精确确定滴量.
- 从落下体积和接触面积计算接触角度,使用球形帽模型.
主要成果:
- 上方视图方法为小滴 (1-10μL) 提供了与侧面视图方法相比较的接触角值.
- 测量了PMMA和Teflon表面上水和甲胺的接触角度,测量了湿和不湿的模式.
- 引入掉落投影指数 (DPI) 并量化重力效应,显示不同表面湿度和液体的不同值.
结论:
- 在球形帽假设下,顶部视图方法是接触角度测量的实用和准确的替代方案,特别是对于小滴.
- 该研究为在各种材料系统中增强上方视图方法的适用性提供了基础.
- 新引入的DPI提供了一个有价值的工具,用于理解和纠正重力诱导的扭曲在顶部视图落分析.
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