Can a Dynamic Contact Angle Be Understood in Terms of a Friction Coefficient?

The kinetics of capillary rise of pure water and ethanol as well as mixtures thereof that under static conditions wet glass capillaries has been studied by a high-speed imaging technique. To adequately describe the experimental data, a rate-dependent dynamic contact angle must be added to the Washbu...

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Bibliographic Details
Published inJournal of colloid and interface science Vol. 226; no. 2; pp. 199 - 204
Main Authors Hamraoui, Ahmed, Thuresson, Krister, Nylander, Tommy, Yaminsky, Vassili
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 15.06.2000
Elsevier
Subjects
capillary rise
Chemistry
dynamic contact angle
Exact sciences and technology
friction
General and physical chemistry
Solid-liquid interface
Surface physical chemistry
wetting
wetting
dynamic contact angle
capillary rise
friction
Water
Dynamic contact angle
Liquid solid interface
Ethanol
Experimental study
Capillary tube
Primary alcohol
Binary mixture
Wettability
Equations of state
Friction coefficient
Aqueous solution
Charcoal
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Summary:The kinetics of capillary rise of pure water and ethanol as well as mixtures thereof that under static conditions wet glass capillaries has been studied by a high-speed imaging technique. To adequately describe the experimental data, a rate-dependent dynamic contact angle must be added to the Washburn-Lucas equation. This result is discussed in terms of a molecular friction coefficient at the front of the liquid flowing over the substrate. Dynamic inertia effects are significant at the initial stages of spreading and may have further importance for capillaries of larger radii. In addition, it was found that the preparation and cleaning of glass capillaries, which are essential for the liquid substrate interaction, have a significant effect on the initial rate of rise of the liquid.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.2000.6830