Method and System for Measuring the Zeta Potential of the Cylinder's Outer Surface

摘要

The present invention discloses a method for measuring the zeta potential at the cylinder's outer surface. In the measuring cell, the cylinder is held coaxially inside a reference tube and a given solution is forced to flow through the annular flow channel between the cylinder and the reference tube. The streaming potential induced by the flow forced with a hydraulic pressure drop is measured to determine the zeta potential, zeta_m, of the cylinder's outer surface by using the following Equation, $\frac{\stackrel{\_}{E}}{\mathrm{Delta}P}==-\frac{D}{\mathrm{mu}k}\left(\frac{{\mathrm{zeta}}_m+{\mathrm{zeta}}_{\mathrm{ref}}}{2}\right)F$ where D is the permittivity, zeta_ref is the zeta potential of the reference tube, mu is the viscosity of the solution, k is the electric conductivity of the solution, and F is a correction factor for the electrokinetic model. Moreover, this invention also discloses a system for measuring the zeta potential of the cylinder's outer surface.