PTFE is hydrophobic : neither water nor water-containing substances wet PTFE, as fluorocarbons demonstrate mitigated London dispersion forces due to the high electronegativity of fluorine.
22.
The Van der Waals force ( or dispersion force ) is also unusual, obeying an inverse cubic, asymptotic power law in contrast to the usual inverse quartic.
23.
Thus, the London Dispersion Forces between ethane molecules are higher than that between methane molecules, resulting in stronger forces of intermolecular attraction, raising the boiling point.
24.
The non-directional nature of dispersion forces typically allows easy plastic deformation, as planes of molecules can slide over one another without seriously disrupting their attractive interactions.
25.
Covalent molecular structures are by far the most likely to be gaseous, especially if they have only dispersion forces, though the molecular mass is certainly a factor.
26.
The interaction between two permanent multipole moments also contributes to the intermolecular force and the first term ( quadrupole-quadrupole ) is as important as the London dispersion force.
27.
Lipophilicity, hydrophobicity, and non-polarity " can " describe the same tendency towards participation in the London dispersion force as the terms are often used interchangeably.
28.
We note in the former article that " dispersion forces are usually dominant of the three van der Waals forces ", with the other two being orientation and induction forces.
29.
Since molecular hydrogen only has two electrons, dispersion forces are weak, typically 4-7 kJ / mol, and are only sufficient for adsorption at temperatures below 298 K.
30.
Van der waals interactions include nonpolar interactions ( i . e . London dispersion forces ) and polar interactions ( i . e . hydrogen bonds, dipole-dipole bond ).
