Liquid - polymer equilibrium "contact" distance

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LouisD
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Hi everyone,

In this paper ( http://pubs.acs.org/doi/abs/10.1021/la962131c ), the authors calculate the surface energy of polymer and the contact angle of various liquids on these polymers using a so-called "liquid - polymer equilbrium contact dsitance". I'm wondering how to calculate such a value ?

Thanks
 
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