Light absorption spectra were used to estímate gold particles growing kinetics following a gold salt (HAuCl4) reduction by sulfite in aqueous solution. Due this process is extremely fast, e.g. part1cles reach 150nm s1ze in less a second, a special equipment denorninated Stopped Flow Reactor (AFR) was used. Light spectra was modeled using Mie theory for monodisperse particles with1n 30-250nm range size, and tor minor sizes experimental spectra of commercial colloids were used, due to uncertainly in dielectric constant for these sizes.Three different approaches were proposed to estimate the gold particles size distribution evolution, and experimental intensity and shape of spectra were used to validate the computation. The most simply approach considers the assumption that particles are compact spheres and monodisperse, following model of LaMer. A second approach is based on growth model ...

Light absorption spectra were used to estímate gold particles growing kinetics following a gold salt (HAuCl4) reduction by sulfite in aqueous solution. Due this process is extremely fast, e.g. part1cles reach 150nm s1ze in less a second, a special equipment denorninated Stopped Flow Reactor (AFR) was used. Light spectra was modeled using Mie theory for monodisperse particles with1n 30-250nm range size, and tor minor sizes experimental spectra of commercial colloids were used, due to uncertainly in dielectric constant for these sizes.Three different approaches were proposed to estimate the gold particles size distribution evolution, and experimental intensity and shape of spectra were used to validate the computation. The most simply approach considers the assumption that particles are compact spheres and monodisperse, following model of LaMer. A second approach is based on growth model ...