Static contact-angle measurements have been used to study water and five organic liquids (n-decane, benzene, acetonitrile, octyl cyanide, and sebaconitrile) on bare silica and on a range of silanized silica surfaces. We have used these measurements to determine the polar and dispersive components of the surface energies of these liquids and of the modified silica surfaces. These data offer clues into the microscopic structuring of the liquids and how this structuring is influenced by solid interfaces. We have also observed a strong relationship between the polar and dispersive components of the surface energies of the modified silica surfaces.
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