A Study on Particle Dispersion Technique and Powder Adhesiveness

Abstract

A method for dispersing dry particles is described in the point of view of adhesiveness of particle. In any dispersion method, the dispersion of an agglomeration comprised of smaller particles requires a higher powered dispersion force or separation force. However, the adhesion force between particles decreases with decreasing of particle size. This suggests the difficulties in applying the separation force to the agglomeration increase with decreasing particle size. This presumption leads to the expectation that the agglomeration of nano-order particles could be disrupted easily if an effective method for applying a dispersion or separation force could be found. Based on the presumption, we tried a novel dispersion method involving a coating of large carrier particles with fine particles and a surface cleaning by a sonication in a liquid. In this paper, concept and dispersed results of the method are introduced. In addition to the introduction of the dispersion method, how to express a powder adhesiveness relating to a dry dispersion and the example of an application of the adhesives to evaluation of disperser performance is also described.