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- W2265372705 abstract "The stability of a system consisting of droplets of water, stabilised using varying concentrations of the surfactant sorbitan mono oleate (SMO) (0-20% by weight) in a continuous oil phase of Prosol 12 was investigated. In the first instance the interfacial tension between the water and the oil was measured as a function of the weight % SMO in the oil. The interfacial tension was found to decrease from an initial value of 61.7 mN/m to a minimum of 22.6 mN/m at 5.0% SMO before rising to produce a local maximum of 24.1 mN/m at 7.5% SMO by weight. Two independent methods were adopted to characterise the tendency of the droplets to coalesce. In the first series of tests, 15 droplets of water were released and allowed to settle through the oil phase, and then land at a planar interface between the oil and a continuous region of water at the base of the vessel. The droplet population was measured as a function of time, thus providing a measure of the time required for a droplet to penetrate through the thin film of oil ahead of the interface, and hence coalesce. The mean coalescence time increased from about 2 seconds at 0% SMO to a maximum of 160 seconds at 7.5% SMO by weight, before again decreasing. In the third test, a coarse water in oil emulsion was formed, and the droplets allowed to coalesce, producing a water homophase at the base of the system. The rate of rise of the homophase was then measured. The rate of rise was found to be a minimum when the concentration of SMO was 8% by weight. In conclusion, the stability of the emulsion system was found to be greatest at about 7.5% SMO. The consistency of the results demonstrated the value of each method for characterising the stability of emulsions. This work is expected to find application in the stability assessment of emulsion explosives." @default.
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- W2265372705 date "1996-01-01" @default.
- W2265372705 modified "2023-09-24" @default.
- W2265372705 title "The Influence of Sorbitan Mono Oleate on the Stability of Water Droplets in a Continuous Oil Phase" @default.
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