为什么气泡的凝结速度比滴滴更快:接口流动性和表面电荷的影响
Ivan U Vakarelski1,2, Farrukh Kamoliddinov1, Sigurdur T Thoroddsen1
1Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
由于接口的移动性,气泡的凝聚速度比油滴快. 固定泡接口或增加pH值显著延迟凝聚,与油滴不同.
科学领域:
- 合体和表面科学科学
- 流体动力学 流体动力学
- 接口现象 接口现象
背景情况:
- 气泡和水滴的凝聚在各种工业过程中至关重要.
- 空气泡和油滴之间的凝聚时间的差异表明了不同的界面特性.
研究的目的:
- 研究影响气泡和碳油滴凝聚时间的因素.
- 量化界面移动性和pH对凝聚力学动态的影响.
主要方法:
- 高速成像用于监测自由起的气泡和自由落的油滴的凝聚.
- 在一系列pH值 (3.0,5.6,11.0) 的纯水中进行的实验.
- 使用酸单层和高电解质度 (0.6M NaCl) 的接口固定.
- 数字模拟用于分析移动和不移动接口的薄膜排水时间表.
主要成果:
- 空气泡在所有纯水中测试的pH值中都表现出快速凝聚 (毫秒).
- 固定空气-水接口显著延迟了泡凝聚,在更高的pH值下时间更长.
- 碳油滴表现出较慢的凝聚 (秒),这是不动接口的特征,并且在pH11时完全稳定.
- 高电解质度导致气泡和水滴的凝聚时间相似,这表明接口不移.
结论:
- 接口流动性是气泡快速凝聚的主要因素.
- 取决于pH值的表面电荷和接口流动性显著影响泡和滴滴的凝聚率.
- 电解质度可以改变界面特性,导致延迟凝聚.
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