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Dynamics of Spontaneous Spreading with Evaporation for thin Solvent Films

Published online by Cambridge University Press:  10 February 2011

Anne D. Dussaud  and
Sandra M. Troian
Anne D. Dussaud
Affiliation:
Department of Chemical Engineering, Princeton University, Princeton NJ 08544–5263
Sandra M. Troian
Affiliation:
Department of Chemical Engineering, Princeton University, Princeton NJ 08544–5263
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Abstract

We have investigated the spreading behavior of solvent droplets on a bulk water support using solvents with different vapor pressures and spreading coefficients. Instead of seeding the surface with tracer particles, as is usually done to track moving fronts, we employ laser shadowgraphy to visualize the entire surface of the spreading film including the leading edge. For non-volatile systems it has previously been shown that the leading edge advances in time as t3/4. We find that volatile systems with positive initial spreading coefficients exhibit two spreading fronts, both of which demonstrate power law growth but with exponents closer to 1/2. Surprisingly, differences in the liquid vapor pressure or the spreading coefficient seem only to effect the speed of advance but not the value of the exponent. We are presently investigating the behavior of the subsurface flow to determine the mechanism leading to the smaller spreading exponent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 201
Copyright
Copyright © Materials Research Society 1997

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References

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