Abstract
A stable, highly concentrated heptane-in-water emulsion stabilized with a polyethylene oxide–polypropylene oxide–polyethylene oxide (PEO–PPO–PEO) triblock copolymer (Synperonic PE F108, M=14 000) is prepared. The stability of the emulsion is characterized by monitoring the droplet size distribution with the NMR self-diffusion method. The results are compared with data from investigations of a single foam film. The surface force versus foam film thickness isotherms at different electrolyte concentrations (0–0.05 M NaCl) are measured directly by the thin liquid film pressure balance technique. By comparing the highly concentrated emulsion to single foam films under similar conditions, it is concluded that the emulsion is stabilized mainly by steric surface forces. It is demonstrated that the stability of highly concentrated O/W emulsions can be successfully modeled if the modeling is based on studies of the interaction forces in thin liquid foam and emulsion films.
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