Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 282, Issue -, Pages 256-262Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2006.01.001
Keywords
contact angle hysteresis; rate of motion of three-phase line; surface forces; viscosity; hydrodynamics
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Contact angles of different liquids on smooth and homogeneous films of Teflon AF 1600 were studied as a function of rate of motion of the three-phase line. For liquids with a dynamic viscosity of well below 10 (cP), neither advancing nor receding angles are influenced significantly by the rate of motion up to similar to 12 (mm/min). On the other hand for more viscous liquids increasing the rate of motion causes the advancing angles to increase and the receding angles to decrease. Such dynamic contact angles may not be used in conjunction with the Young equation. (c) 2006 Elsevier B.V. All rights reserved.
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