ABSTRACT
The adhesive force between particles or a particle and a solid surface plays an important role in powder-handling processes such as dry dispersion, transportation and classification of particles. The electrostatic force in the gas phase arises from the particle-charge interaction, the image-charge effect and the electrostatic contact potential difference. The term “adhesive force” is defined as the maximum attractive interaction force during which the particle is removed in the normal direction, thus, it is called the “pull-off force.” The techniques for the measurement of adhesive force can be classified into several categories. One of the specific properties of solid surfaces immersed in liquid is that the active adsorption of solutes on solid-liquid interfaces. The adhesive strength distribution can also be obtained from the relationship between the particle reentrainment efficiency and the fluid dynamic separation force. Adhesive force is significantly affected by the contact states such as deformation and multiple-point contact, which also depend on the viscoelasticity, geometry and surface roughness.
