Abstract
Transient characteristic of electric double layer which will be a key issue for a microscale multiphase flow system in future was investigated by using micron-resolution particle image velocimetry. The present study focused on deprotonation at glass surface by varying pH of buffer solutions, inducing a change in ξ-potential of glass surface. Time-series measurements of ξ-potential were first achieved by using experimental data of electroosmotic mobility that was calculated by subtracting electrophoretic velocities of sub-micron particles from observed velocities. The ξ-potential at a steady state showed a good agreement with the theoretical one.
