Non-DLVO, steric and fluctuation forces

Origin of Main type of Solvation Force : TheOscillatory Force• It is important to note that it is more correct to think of thesolvation force as the van der Waals force at small separationswith the molecular properties and density variations of themedium taken into account.• It is also important to appreciate that solvation forces do notarise simply because liquid molecules tend to structure intosemi-ordered layers at surfaces. They arise because of thedisruption or change of this ordering during the approach of asecond surface. If there were no change, there would be nosolvation force.