Abstract
The surface and interfacial tensions for fluorocarbon aqueous emulsions used in artificial blood substitutes are evaluated over a wide range of surfactant concentrations. The surface tension of the nonionic surfactant in water is directly correlated to the interfacial tension between aqueous and fluorocarbon phases by a surface energetics model of isolated dispersion and polar contributions to interfactial work of adhesion and interfacial tension. This study shows that the polymeric surfactant which is an A-B-A triblock copolymer, where A is polyethylene oxide and B is polypropylene oxide, displays prominent surface and interfacial tension transitions at c=1×10−7 and c=0·10 weight fraction detergent in water. The c=10−7 transition is shown to produce a prominent change in the extensibility of the fluorocarbon to water interface and formation of a strong interfacial film that enhances emulsion stabilisation.
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