Abstract
The most essential problem in the particle size analysis of powders including submicron particles is how to disperse the sample sufficiently. The dispersibility of a sample powder is affected by many factors, such as the method, power and time of ultrasonication, the kinds and amount of dispersant agent, the concentration and treatment of suspension, and so on.
The effect of the sample preparation condition on particle size analysis was discussed experimentally by using common advanced ceramic powders. Laser scattering and diffraction method, and the X-ray sedimentation method were used to measure the particle size distribution of dilute or concentrated suspension. The dispersibility of these suspensions were evaluated by their own zeta potential.
The following results were obtained. The dispersing state were affected by the zeta potential, the total surface area of the sample powder, and the particle diameter. The dispersibility of the submicron powders were easily changed by ultrasonication. Ultrasonicated suspension must be stirred continuously to maintain stability.
