In-situ analysis of rheological and electrochemical properties of carbon nanoparticle suspension

Understanding the internal structure of materials is crucial for developing and optimizing chemical and mechanical processes. Rheological analysis has elucidated the internal structure and interactions of complex material systems. However, this analytical method faces difficulties in sample preparation and measurement. In this study, an in-situ combination of rheological measurement and electrochemical spectroscopy was introduced to investigate the internal structure of carbon black dispersed glycerol suspension. The electrochemical characteristics of the suspension were measured with respect to the shear rate and shear stress. The Nyquist plot was also analyzed according to the particle concentration. At a low concentration, the resistance decreased with an increase in the shear rate, while at a high concentration, the resistance increased. These results are attributed to the resistivity change of glycerol and the destruction of the network structure of carbon black particles. In addition, an abrupt increase in impedance was observed when the applied shear stress exceeded the yield stress.