What is the structural component of disjoining pressure?

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Disjoining pressure is understood to consist of three components: dispersion (Van der Waals), electrostatic, and structural. While established formulations exist for calculating the dispersion and electrostatic components, no explicit equations for the structural component are readily available. The structural effects on physical properties are irregular and cannot be easily summarized in a standard equation. Additionally, the other two components incorporate a "molecular area" approximation. Further research may be needed to clarify the structural component's role in disjoining pressure.
Yinxiao Li
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It is widely believed that there are three components of disjoining pressure: the dispersion component (Van der Waals), the electrostatic component and the structural component. For the first two, there are some accepted formulations for calculation. However, I cannot find any equations for the structural components. Is there any papers that give an explicit equation?
Thanks!
 
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Structural effects on physical properties aren't regular enough to be summed up in any sort of cookbook equation, sorry. If you read carefully, you'll find the other two components have a "molecular area" approximation built into them.
 

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