Abstract
Abstract The interaction between two liquid surfaces plays a central role in aerosol microphysics and liquid-drop aggregation phenomena. We study the ripplon (quantized capillary-tension waves) contribution to the interaction energy between two parallel planar liquid surfaces. For 4 He and separations between both liquid surfaces ≳10 A, the effect of ripplon excitation is negligible (smaller than 10 −3 ) compared with the van der Waals energy corresponding to two flat liquid 4 He surfaces. At smaller separation distances, the ripplon contribution to the interaction energy can no longer be considered as a perturbation and it should be included in any detailed analysis of liquid-liquid interactions.
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