Influence of inorganic coating over diamond particles on interaction force and dispersability in electroless solution

Abstract The inorganic coating of Al 2 O 3 was introduced on nanoparticles to weaken their tendency of agglomeration in electroless plating bath. The influence of the coating on interaction energy and interaction forces between the coated particles was evaluated in this study. The Al 2 O 3 -coated diamond particles were prepared by the heterogeneous nucleation process. The attractive interaction and repulsive interaction between the coated particles in electroless nickel (EN) solution were calculated by the classical DLVO theory. Sedimentation tests were conducted to verify the modelling. The calculation predictions are well in agreement with the experimental results. The Al 2 O 3 coating could reduce van der Waals attraction by enlarging the surface separation distance of diamond particles, and could increase electrical double layer repulsion by increasing the surface potentials in EN solution. Consequently, it could weaken the net attractive interaction, whose net attractive force decreased from −3.77×10 −2 N/m between bare particles to −1.12×10 −2 N/m between the coated ones, a reduction by 70%, at the separation distance of 1 κ −1 . The coated diamond particles in EN solution show a slower settling rate than bare ones. The Al 2 O 3 coating contributes to the high dispersability of the coated particles under the agitation condition.