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Abstract
Model emulsions were de-emulsified using a biosurfactant produced by Bacillus subtilis MO-1 mixed with chemical de-emulsifiers. The speed and efficiency of de-emulsification by polyether type de-emulsifier (G-17) were enhanced by combined use of a biosurfactant produced by B. subtilis MO-1 (BS); this effect was more apparent at low concentrations. Polyether/biosurfactant synergy was confirmed by electrochemical measurement of the interfacial film electrical resistance (R
m
) and capacitance (C
m
) during de-emulsification. These values were closely related to the rate of water removal, demonstrating that electrical techniques are suitable for studying de-emulsification phenomena.
ACKNOWLEDGMENTS
The authors thank Prof. Zhang Ru-Yuan for his kind assistance.