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Van der Waals Interaction between Two Truncated Spheres Covered by a Uniform Layer (Deformed Drops, Vesicles, or Bubbles)
Ist Teil von
Langmuir, 2001-04, Vol.17 (8), p.2357-2362
Ort / Verlag
American Chemical Society
Erscheinungsjahr
2001
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In this paper, we derive explicit expressions for the van der Waals interaction energy and force between two truncated spheres covered by a thin layer of uniform thickness. These expressions can be used for description of the interactions in dispersions of deformable particles (emulsions, vesicle suspensions, and foams). As an illustration of the applicability of these formulas to real systems, we consider the interaction between micrometer-sized oil drops, covered by a protein adsorption layer, in oil-in-water emulsions. The Hamaker constants for the interactions between protein, oil, and water are calculated from literature data. The equilibrium radius and thickness of the liquid film, which forms upon the collision of two emulsion drops, are determined as functions of the drop size and electrolyte concentration. From the parameters of the equilibrium films, we calculate the total interaction energy between the drops. The numerical results show that both factors, the presence of the protein layer and the drop deformation, have a significant effect on the pair interaction energy.
Sprache
Englisch
Identifikatoren
ISSN: 0743-7463
eISSN: 1520-5827
DOI: 10.1021/la001557v
Titel-ID: cdi_crossref_primary_10_1021_la001557v
Format
–
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