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Gravitational drainage of vertical films supported on a wire frame ofsuperspreader SILWET L-77 and its cousin non-superspreader SILWET L-7607revealed drastic differences. The superspreader films showed complicateddynamic turbulent-like interferometric patterns in distinction from the orderedcolor bands of the cousin non-superspreader which reminded those of theordinary surfactants. Nevertheless the superspreader films stabilizedthemselves at the thickness below 50 nm and revealed an order of magnitudelonger life time before bursting compared to the cousin non-superspreader.Notably, the superspreader revealed drastic differences from thenon-superspreader in aqueous solutions with no contact with any solid Teflonsurface. The theoretical part of the work attributed the self-stabilization ofthe superspreader films to significant disjoining pressure associated with thevan der Waals repulsion of the fluffy surfaces of the film formed by longsuperspreader bilayers hanging from the free surfaces. The non-superspreadersdo not possess any significant disjoining pressure in the film with thicknesseseven in the range 30-50 nm. The results show that gravitational drainage ofvertical films is a useful simple tool for measuring disjoining pressure.

Gravitational Drainage of Thin Films of Trisiloxane-(Poly)ethoxylate Superspreaders