Why do fat bonds cause more repulsion between each other than thin bonds?
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Explanation:
11.1.1 Molecular Adsorption
Bonding at organic–organic and organic–inorganic interfaces results from the interplay of several interactions, most notably (covalent) hybridization of wave functions, electron transfer processes, van der Waals (vdW) interactions, and Pauli repulsion [5]. The weakest bonding regime is represented by pure physisorption, where the attraction between the adsorbate and the substrate is mainly due to vdW forces. Whereas typical binding energies per atom are relatively low (1–10 meV/atom), they can exceed 1 eV/molecule [6] depending on the lateral molecular extension. Consequently, the total interaction energy of a molecule (integrated over its contact area with a surface) can be substantial and comparable to that of strongly interacting atomic
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