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4 cards from this section. Quick, good the night before a test.
Define the angle of contact.
Think about the interaction between liquid and solid at their boundary.
What happens when water is spilled on glass?
Consider the behavior of the liquid on the surface.
What is the angle of contact?
Focus on the definition provided regarding the interaction.
True or False: A high contact angle indicates good wetting of surfaces.
Recall the definition of wetting related to the contact angle.
Analyze how changing the surface material from plastic to glass affects the contact angle of water. Given the interfacial tensions, calculate the new angle of contact if the tensions are Sla = 0.0727 N/m, Ssa = 0.030 N/m, and Ssl needs to be determined.
Refer back to the established relationship for interfacial tensions.
A laboratory experiment shows that a new polymer reduces the contact angle of water on a surface from 90 degrees to 45 degrees. Calculate the change in wettability and provide a physical explanation for this phenomenon.
Consider how the properties change the attraction between water molecules and the surface.
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