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Description: The apparent contact angle measured from the average surface plane can differ significantly from the true contact angle at a locally inclined surface (top). Even if a pore is water-wetting, the surface water may not be a double layer, but could be thicker due to pore rugosity (bottom). At an asperity, the surface forces are more favorable for displacing the double layer than elsewhere on the surface.
Source: Wael Abdallah: Fundamentals of Wettability (Schlumberger)