ZETA POTENTIAL IN POROUS MATERIAL

Basic Models with additional OPTIONS and ACCESSORIES. Download BROCHURES.

Electroacoustics offers unique possibility of characterizing both types of heterogeneous systems: porous material and particulates with the same device. Model DT-330 is such Universal Zeta potential Probe, whereas Model DT-350 was designed for porous materials exclusively. Similar measurement can be conducted with the Model DT-1202 if it is equipped with Option OP0014.

The main principles of Electroacoustics in porous material are presented in ISO Standard 13099, Parts 1 and 3: 2012. Colloidal systems – Methods for Zeta potential determination.

All details of these instruments are described in the US Patent by Dukhin, Goetz and Thommes from 2012 “Method for determining porosity, pore size and zeta potential of porous bodies”.

Zeta potential probe designed by Dispersion Technology Inc has a flat face. Therefore it can be simply placed on the top of the porous body, as shown below with a sandstone core.

zeta-potential-in-porous-material

Then we can change pH of the liquid that saturates porous material and observe how surface charge of the pores varies with pH. Such pH titration of Berea SS sandstone core is shown below.

zeta-potential-in-porous-material2

Some examples of these measurements can be found in the following papers: