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Principles of Video Contact Angle Analysis, Medicine, Page 13

Principles of Video Contact Angle Analysis

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Harmonic-Mean Method
• Free energy of adhesion between phases is equal to the Harmonic
Mean of two separated phases.
• Wu's Method
• Suitable for non-polar low energy surfaces.
• Require at least two kinds of drops with different surface tensions.



γγd d
γγ 
p p
γ  θ  d i s d  p i s p  i  2
i (1 cos i ) 4 1,
i  s γ  s 
γ γ i γ



γγ  ip i  2
θ: contact angle of testing drop i
i
d
i γ 1, i

γ: surface tension of testing drop i
i



γ 
γ, γ : dispersion and polar energy of testing drop i
d p


s γ γ d
s
p
s
i
d
s
i

γ, γ : dispersion and polar energy of testing surface
p
s




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