Application for Powder Dispersibility and Interface Characterization Using Low-field NMR

Abstract

The dispersibility and wettability of the powder can be possible to measure by pulse NMR. The characteristic is being able to measure with good reproducibility in a short time without diluting. As a concrete measurement example of dispersibility, we compared with the particle size distribution measurement depending on the dispersion time on low concentration carbon nanotubes. Which was about 0.02%. Next, we compared the graphene dispersion sample from 10% to 50% by pulse-NMR and diluted sample by laser diffraction measurement. In the example of comparing the results in the diluted state have good correlation. However, in the case of different concentrations, there was no correlation. In addition, as a concrete evaluation example of wettability, surface treatment of powder was performed, and the difference in wettability to pure water and hexane were compared. Furthermore, an example was shown in which the wettability to the resin was also compared. Although it only shows simple applications, we think this valuation method has a high potential by the user’s idea.