Development of interface-urrent measuring method and study of driving mechanism of electro-smotic flow

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The interface-current, an ionic motion within the electric double layer(EDL) of a solid-liquid interface, drives the electroosmotic flow in a micro channel. The thickness of the EDL is so thin, order of lOnm that direct measurement of the current is quite difficult. Using a variable gap micro-channel together with a diffuse double layer model, the interface-current can be measured correctly. From the pure water experiment, the temperature rise within EDL due to the Joule heating of the current is shown to be 4-6 degree. It was also shown that the ionic mobility of H^+ in EDL is extremely increased, perhaps due to the structure change of the water molecule there.