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Electrophoresis of gas bubbles, Associate Prof Vladimir Lobaskin

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14:00 – 15:00 18 Oct 2018
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Room 128 Science Centre North, University College Dublin, Belfield, Dublin 4, Ireland

Water is known for its exceptional dielectric properties and its ability to separate charges. Thanks to this ability, most materials acquire electric charge at the interface with water upon immersion. A particular example of such charging is presented by air-water interface. The phenomenon of charging can be probed by bubble electrophoresis: motion of gas bubbles in an electric field.

In this talk, I discuss the special properties of water and present a numerical study of electrophoresis of a gas bubbles using computer simulation. The model assumes that the bubble charging, which is responsible for its motion in an external field, results from a preferential adsorption of solution anions at the gas-water interface. While in simple electrolytes motion of a bubble resembles that of solid particles, in solutions of multivalent salt we can observe an anomalous electrophoresis: motion of the bubble opposite the direction prescribed by the surface charge. I show that the electric double layer around the bubble also acquires an anomalous dipole moment directed against the external field in contrast with the charged solid particle picture.

Organised by: School of Physics UCD

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Location icon
Room 128 Science Centre North, University College Dublin, Belfield, Dublin 4, Ireland
Clock icon
14:00 – 15:00 18 Oct 2018

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