Relative Viscosity for the Analysis of Adsorption Behavior of Additives: Dispersion of Nanocarbon Particles in Water with Cellulose-Based Dispersants

Abstract

Understanding the dispersion state of nanocarbon particles in water is essential in the manufacturing technology of various products, including a secondary battery. When an excess amount of dispersant is added to the particle dispersion, the rheological properties of the dispersion are considered to change due to rheological changes in the aqueous solution of the excess dispersant without changing the dispersion state of the particles. In such cases, the relative viscosity, which is the ratio of the viscosity of the dispersion to that of the dispersant solution, should be consistent. In the present study, we proposed a method to investigate the composition of the dispersant solution and the amount of adsorption on the particles using the relative viscosity as an index. The validity of the adsorption amount of the dispersant was validated from various aspects, and the influence of the preparation method of the particle dispersion on the adsorption behavior of the dispersant was also discussed.