Lubrication and Electrochemical Characteristics of Baijiu With Different Qualities

The Baijiu market is complex and vast, rapid and effective identification of Baijiu quality will be beneficial to Baijiu production and market management. Here, tribological methods were employed to distinguish Baijiu from varying quality levels based on their physicochemical properties. The nano Zetasizer, atomic force microscope (AFM), rheometer, and contact angle meter were used to characterize the particle size, viscosity, and wettability of Baijiu with different qualities. Results reveal distinct physicochemical properties among different grade Baijiu, affecting their tribological responses. They also significantly depend on the friction pairs and applied loads. These findings demonstrate that tribology offers a rapid and reliable approach for Baijiu quality assessment. Additionally, differences in metal element composition, polarization curves, and electrochemical impedance spectra (EIS) across samples were explored. The comparison between two identification methods further proves the effectiveness and simplicity of the tribology test. This research helps to identify Baijiu quality quickly and simply.