Surface tension and dynamic contact angle of water in thin quartz capillaries

The surface tension of water has been measured in quartz capillaries with r adii from 200 down to 40 nm. It appears that the surface tension does not d iffer from the known (bulk) values in the temperature range from 8 to 70 de grees C, within 1% experimental error. The dynamic contact angle, theta(d), vanishes when the capillary surface is covered with a wetting film left be hind the receding meniscus. In the case of a dry surface, theta(d) depends on the velocity of the meniscus motion. The results obtained do not agree w ith presently available theoretical predictions from hydrodynamic theories of dynamic contact angles. Rather the kinetics of water vapor adsorption ah ead of the moving meniscus seems to be the major controlling agent of the d ynamic contact angle, (C) 2000 Academic Press.