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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)
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