Fast coagulation of gold sols. Rate constants for dimerization of nanoparticles

By using the generalized Mie theory, the extinction cross sections for dimers of 46-nm gold particles immersed in water have been calculated. It has been found that, in the region of high-energy plasmon resonance band, the maximum value of normalized extinction cross section Qext1 gradually decreases as particles approach each other. The greatest changes in Qext1 are observed when interparticle distance h decreases from 10 to 3 nm. At shorter...