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updated at 22:03:41 on 28/6/2008 Ph.D. María Tirado-Miranda LecturerDepartment of Applied Physics Faculty of Sciences (Google Earth) University of Granada Campus de Fuentenueva s/n 18071 Granada (Spain) Tel: +34-958246104 Fax: +34-958243214 E-mail: mtirado@ugr.es |
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NEWS: the III Reunión Ibérica de Coloides e Interfases (RICI3) and VIII Reunión del Grupo Especializado de Coloides e Interfases (VIIIGECI) will be held in Granada, 13-15th July 2009
Considerable interest has been focused on the study of dynamic structures, in which an irreversible addition of subunits leads to cluster formation. The aggregation of colloidal particles is a good model for studying this structure formation phenomenon, which can be described by the time evolution of the cluster-size distribution. Determining the detailed cluster-size distribution is important since many of the physical properties of a colloid depend on that distribution. Powerful light scattering techniques have been successfully used to determine these cluster-size distributions. In this study, static and dynamic light scattering were used to detect the size distributions of aggregating colloidal dispersions. Dynamic light scattering allows to obtain the mean diffusion coefficients of the aggregates and their mean hydrodynamic radius. Static light scattering assesses the internal structure of aggregates by measuring the angular dependence of the scattered light. Either of these techniques has proven to be a very suitable tool to study aggregation processes without perturbing the aggregating system.