Properties of the Collision Efficiency of Nanoparticles in Brownian Coagulation

The collision efficiency of nanoparticles with diameters from 100 nm to 750 nm in the Brownian coagulation is studied by building and solving numerically the equations of particle collision in the presence of the van der Waals force, the elastic deformation force, the Stokes resistance, the lubrication force and the electrostatic force. The results show that the collision efficiency decreases overall with the increasing particle diameter. It is found that there exists an abrupt increase in the collision efficiency when the particle diameter equals 550 nm. Finally a new expression for the collision efficiency is presented.