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Abstract
The critical supersaturation, ( p p e) c , values for the condensation of water vapor on various smooth organic substrates and the values of contact angle, θ, between water and these substrates were determined by simple experimental techniques. The experimental relationship between ( p p e) c and θ agrees satisfactorily with the classical nucleation theory of spherical cap model. In the theoretical calculation, both the direct addition of the vapor molecules and the indirect addition of the adsorbed molecules by two-dimensional migration to the condensate nuclei were considered; and it was assumed that the adsorbed vapor molecules on the substrate surface behaved like two-dimensional gas. The coefficients k a in the adsorption isotherm and the contact angle are essentially two different ways of expressing the affinity between the vapor molecules and the substrate surface. The theoretical relationship between k a and θ based on the classical nucleation theory is also presented.
Published Version
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