Abstract
The frequency dependence of the magnetic susceptibility in the range 10 Hz–10 kHz is used to study the effect of resin concentration, surface pH of the magnetic particles, and milling time on the dispersion process. The parameters used to fit the Cole–Cole model to experimental frequency dependences characterize the `dispersion quality’ of the inks. The low frequency susceptibility and the relaxation time of the susceptibility increase with the milling time and/or resin concentration, suggesting improved dispersion quality. For an acidic wetting resin (polyvinylchloride-acetate copolymer) the increase is more significant if the particles’ surface provides basic sites for strong chemical adsorption. The dispersion quality decreases for acidic particle surfaces indicating that they do not provide adsorption sites strong enough to ensure steric stabilization of the inks.
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