Investigating nanoparticle aggregation dynamics in an aqueous magnetic fluid by light scattering anisotropy

摘要

Light scattering on particles having the diameter comparable with the wavelength is accurately described by the Mie theory. The light scattering anisotropy can conveniently be described by the one parameter Henyey Greenstein phase function. An aqueous suspension containing magnetite nanoparticles was the target in a coherent light scattering experiment. By fitting the scattering phase function on the experimental data the scattering anisotropy parameter can be assessed. As the scattering parameter strongly depends of the scatterer size, the average particle diameter was estimated using this dependence and particle aggregates presence was probed. This technique was used to investigate the nanoparticle aggregation dynamics and the results are presented in this work.