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Surface Tension and Dynamic Contact Angle of Water in Thin Quartz Capillaries

✍ Scribed by V.D. Sobolev; N.V. Churaev; M.G. Velarde; Z.M. Zorin

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 66 KB
Volume: 222
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6597

No coin nor oath required. For personal study only.

✦ Synopsis

The surface tension of water has been measured in quartz capillaries with radii from 200 down to 40 nm. It appears that the surface tension does not differ from the known (bulk) values in the temperature range from 8 to 70 • C, within 1% experimental error. The dynamic contact angle, θ d , vanishes when the capillary surface is covered with a wetting film left behind the receding meniscus. In the case of a dry surface, θ d depends on the velocity of the meniscus motion. The results obtained do not agree with presently available theoretical predictions from hydrodynamic theories of dynamic contact angles. Rather the kinetics of water vapor adsorption ahead of the moving meniscus seems to be the major controlling agent of the dynamic contact angle.

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