期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 441, 期 -, 页码 788-795出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2012.10.025
关键词
Three phase contact; Bubble; Impact velocity; Bouncing; Film drainage; Attachment kinetics; Air at hydrophobic surface; Dynamic adsorption layer
资金
- Krakow Interdisciplinary Ph.D. Project in Nanoscience and Advanced Nanostructures
- EU European Regional Development Fund
- Ministry of Science and Higher Education [NN204 133640]
Phenomena occurring during collisions of the rising bubble with hydrophobic surfaces (Teflon and silanized glass) were monitored using a high-speed camera working with a frequency 1040 Hz. The influence of n-octanol concentration on the bubble impact velocity, bouncing amplitude and frequency, the time of three phase contact (TPC) formation (trpc) and the time of drainage (to) of the film formed between the colliding bubble and the hydrophobic surfaces was determined. It was found that low n-octanol concentrations caused a decrease in the t(TPC) in respect to distilled water, due to lowering the bubble impact velocity and bouncing. At high n-octanol concentration the t(TPC) was prolonged as a result of elongation the film drainage time (to). Moreover, when the distance between capillary orifice and solid surface was varied then differences in the t(TPC) were observed. These differences are, in our opinion, related to formation of the dynamic architecture of the adsorbtion layer (DAL) over the rising bubble surface. The explanations of the mechanism of the trpc prolongation for high concentration of n-octanol and influence of the DAL on the t(TPC) are proposed. (C) 2012 Elsevier BV All rights reserved.
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