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117 I. A. Aksay, 6.E. Hoge, andd. A. Pask Wetting under Chemical Equilibrium and Nonequilibrium Conditions
 

Summary: 117 I. A. Aksay, 6.E. Hoge, andd. A. Pask
Wetting under Chemical Equilibrium and Nonequilibrium Conditions
iihari A. Aksay, Carl E. Hoge, and Joseph A. Pask"'
Inorganic Materials Research Division, Lawrence Berkeley Laboratory and Department of Materials Science and Engineering,
Coliege of Engineering; University of California, Berkeley, California 94720 (Received October 17, 7973)
Publication costs assisted by U. S. Atomic Energy Commission
The thermodynamics of a solid-liquid-vapor system both under chemical equilibrium and nonequilibri-
um conditions, based on the model of Gibbs, is discussed. Under chemical equilibrium conditions, the
degree of wetting or nonwetting of a flat and nondeformable solid by the liquid is defined by Young's
equation in terms of the static interfacial tensions. Under chemical nonequilibrium conditions, mass
transfer across an interface results in a transient decrease in the corresponding specific interfacial free
energy and the interfacial tension by an amount equal to the free energy of the effective chemical reac-
tion per area at that interface. When the reaction is between the solid and the liquid, this transient low-
ering of the interfacial tension can cause the liquid drop to spread on the solid substrate if the interfacial
energy reduction is large enough and also if the diffusion rates of the reacting components in the solid
phase are slow enough relative to the flow rate of the liquid to cause the liquid at the periphery of the
drop to be in dynamic contact with unreacted solid.
I. Introduction
The degree of wetting of a solid by a liquid in a solid-
liquid-vapor system is characterized by the conditions of

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science