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. Similar measurement can be conducted with the Model DT-1202 if it is equipped with Option OP0014.
The main principles of Electroacoustics in porous materials are presented in ISO Standard 13099, Parts 1 and 3: 2012. Colloidal systems – Methods for Zeta potential determination.
Our Zeta potential probe have a flat face. Therefore it can be simply placed on the top of the porous body, as shown below with a sandstone core.
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.