Abstract
The objective of this study is to investigate the relation between the f locculation and dispersion of Al2O3, TiO2 and Fe2O3 particles and the properties of solvents such as dielectric constant and solubility parameters. The median diameter of these metal oxide perticles was measured in many organic solvents. The effect of the kind of solvent on the f locculation/dispersion behavior of metal oxide particles was evaluated from these results. Hansen’s solubility parameters with three dimensions were applied to the evaluation of the f locculation/dispersion behavior for fine metal oxide particles in organic solvents. The numeral balance among the Hansen’s solubility parameters of various solvents was plotted in a triangular chart, and then the points of solvents with similar median diameter of the particle were linked. In the triangular chart, these linked lines were not intersected each other and there was the specific point at which the best dispersibility of the particles was obtained.
Highlights
The dispersibility of fine particles in various solvents af fects the quality of the products in the manufacturing process treating suspensions
The DLVO theory, as is well known, explains the dispersion/flocculation behavior of fine particles in aqueous solution. This theory cannot be applied to the particles in organic solvents, because the factors on dispersibility in organic solvents are very complicated
The dielectric constant of a substance is closely concerned with the dipole moment, and the polarity of a substance with high dielectric constant is considered to be large
Summary
The dispersibility of fine particles in various solvents af fects the quality of the products in the manufacturing process treating suspensions. It is important to control the dispersion/f locculation behavior of fine particles in various solvents in the field of paint, printer ink, magnetic material, electronic parts, etc. The DLVO theory, as is well known, explains the dispersion/flocculation behavior of fine particles in aqueous solution. This theory cannot be applied to the particles in organic solvents, because the factors on dispersibility in organic solvents are very complicated. The affinity becomes higher between the solvent with large polarity and the metal oxide particle with large polarity
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