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While individual water molecules adsorb strongly on a talc surface(hydrophilic behavior), a droplet of water beads up on the same surface(hydrophobic behavior). To rationalize this dichotomy, we investigate theinfluence of the microscopic structure of the surface and the strength ofadhesive (surface-water) interactions on surface hydrophobicity. We show thatat low relative humidity, the competition between adhesion and the favorableentropy of being in the vapor phase determines the surface coverage. However,at saturation, it is the competition between adhesion and cohesion (water-waterinteractions) that determines surface hydrophobicity. The adhesive interactionsin talc are strong enough to overcome the unfavorable entropy, and wateradsorbs strongly on talc surfaces. However, they are too weak to overcome thecohesive interactions, and water thus beads up on talc surfaces. Surprisingly,even (talc-like) surfaces that are highly adhesive, do not fully wet atsaturation. Instead, a water droplet forms on top of a strongly adsorbedmonolayer of water. Our results imply that the interior of hydrophobic zeolitessuspended in water may contain adsorbed water molecules at pressures muchsmaller than the intrusion pressure.

Molecular explanation for why talc surfaces can be both hydrophilic and hydrophobic