Abstract
The electrical properties of microbubbles are important in the interaction between bubbles and other materials, such as solid particles, fiber pulps and oil in oil-in-water emulsion, for technical applications of purification processes. The ζ potential was negative in distilled water and was negatively charged in a wide range of pH conditions. However, the effect of electrical potential of gas-water interface on the behavior and the characteristic of microbubbles have not been completely clarified yet. In this study, the compact and low power microbubble generator has been developed, and the ζ potential was measured by electrophoresis method in the several pH conditions. The coalescence process is observed at the time of interaction between two bubbles under low ζ potential conditions. On the other hand, in the case of a bubble with a high electrical potential, the coalescence does not occur due to the large electrostatic repellent force between two bubbles.
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