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Stochastic induction time of attachment due to the formation of transient holes in the intervening water films between air bubbles and solid surfaces.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-16 , DOI: 10.1016/j.jcis.2020.01.027 Saiwei Li 1 , Anh V Nguyen 2 , Zhiqiang Sun 3
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-16 , DOI: 10.1016/j.jcis.2020.01.027 Saiwei Li 1 , Anh V Nguyen 2 , Zhiqiang Sun 3
Affiliation
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HYPOTHESIS
Bubble attachment to hydrophobic solid surfaces is influenced by the liquid film instability. Inclusion of transiently formed holes within the film rather than the so-called hydrophobic force in the theory is expected to better describe and explain film rupture and triple contact line formation in the bubble-surface attachment process. The significance of surface hydrophobicity and hole formation renders the stochastic nature of the induction time of attachment.
EXPERIMENTS
A combination of high-speed video microscopy and theoretical analysis was applied to investigate the induction time of attachment and critical film thickness of air bubbles rising freely perpendicularly to silica surfaces of different hydrophobicities.
FINDINGS
Film rupture occurred statistically for shorter induction times and thicker films on the more hydrophobic surface, rejecting the conjecture of hydrophobic force. Computed results of the critical base radius of the transient holes causing film rupture were merged together nicely, independently of surface hydrophobicity. The paper sheds light on the significance of hydrophobicity on the attachment process by means of a novel and easily implemented methodology, without relying on the debatable hydrophobic force.
中文翻译：
由于在气泡和固体表面之间的中间水膜中形成了瞬态孔，因此产生了随机的附着时间。
假设气泡在疏水性固体表面的附着受到液膜不稳定性的影响。期望在膜内包含瞬时形成的孔，而不是在理论中包含所谓的疏水力，可以更好地描述和解释气泡表面附着过程中的膜破裂和三重接触线形成。表面疏水性和孔形成的重要性使得附着诱导时间具有随机性。实验结合高速视频显微镜和理论分析，研究了气泡的附着诱导时间和临界膜厚，这些气泡垂直于不同疏水性的二氧化硅表面自由上升。研究发现，在较短的诱导时间内，膜破裂发生在统计学上，而在疏水性更强的表面上膜较厚，从而拒绝了疏水力的猜想。独立于表面疏水性，将导致膜破裂的瞬态孔的临界基半径的计算结果很好地合并在一起。本文通过一种新颖且易于实施的方法，阐明了疏水性在附着过程中的重要性，而无需依赖有争议的疏水力。
更新日期：2020-01-17
中文翻译：
由于在气泡和固体表面之间的中间水膜中形成了瞬态孔，因此产生了随机的附着时间。
假设气泡在疏水性固体表面的附着受到液膜不稳定性的影响。期望在膜内包含瞬时形成的孔，而不是在理论中包含所谓的疏水力，可以更好地描述和解释气泡表面附着过程中的膜破裂和三重接触线形成。表面疏水性和孔形成的重要性使得附着诱导时间具有随机性。实验结合高速视频显微镜和理论分析，研究了气泡的附着诱导时间和临界膜厚，这些气泡垂直于不同疏水性的二氧化硅表面自由上升。研究发现，在较短的诱导时间内，膜破裂发生在统计学上，而在疏水性更强的表面上膜较厚，从而拒绝了疏水力的猜想。独立于表面疏水性，将导致膜破裂的瞬态孔的临界基半径的计算结果很好地合并在一起。本文通过一种新颖且易于实施的方法，阐明了疏水性在附着过程中的重要性，而无需依赖有争议的疏水力。
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