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Principles of Video Contact Angle Analysis, Medicine, Page 14

Principles of Video Contact Angle Analysis

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Acid-Base Theory

• Evaluate polar energy based on energy interchange model of acid and
base.
• Suitable for materials with polar surface
• Requires at least three drops of different surface tensions, at least two of
them must be polar fluid.




i (1 cos i ) 2 d d
i s i 
 
γ  θ  γγ  γγ  γγ s
 
i s 
γ: surface tension of testing drop i
i γ 2  
γ d  γ γ
i i i
i

γ : dispersion portion of surface tension
d
i

  γ : surface tension contributed by acid
γ   γγ
s γ 2 d
s s s
i

γ : surface tension contributed by base
i




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