| Abstract
| - The electrophoretic behavior of a nonrigid entity, e.g., liquid entity or bubble, in a spherical cavity is analyzedtheoretically taking the effect of double-layer polarization into account. We show that the electrophoreticmobility of the entity decreases as the ratio (viscosity of surrounding fluid/viscosity of medium inside entity)decreases and its surface potential decreases. If the surface potential is sufficiently high, double layer polarizationhas the effect of producing a local minimum in the electrophoretic mobility as double layer thickness varies.If the double layer is thick, depending upon the level of surface potential, the limiting electrophoretic mobilitywhen the viscosity ratio is much larger than unity (e.g., gas bubble in liquid) is about 5−10 times of thatwhen the viscosity ratio is much smaller than unity (e.g., rigid particle in liquid). For a thin or medium-thickdouble layer, the limiting electrophoretic mobility when the viscosity ratio is much larger than unity is about3 times of that when the viscosity ratio is much smaller than unity. The presence of cavity wall has the effectof retarding the electrophoretic mobility.
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