Study of Electrokinetic Effects Using Sinusoidal Pressure and Voltage

Abstract

The electrokinetic effects streaming potential, streaming current, and electro‐osmotic pressure were studied by applying and measuring sinusoidal variations of hydrodynamic pressure and electrical voltage. Phenomenological relations between the effects were investigated, and an improved experimental method for measuring the electrokinetic coefficients, hence the zeta potential, was used. Saxen's law was verified within 6% at frequencies of 20, 100, and 200 cycles per second. The systems studied were restricted to glass‐water and glass‐salt solutions. The advantages and disadvantages of using sinusoidally varying quantities for electrokinetic measurements are discussed.